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  • 1.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Carlsson, Fredrik
    Lunds Tekniska Höskola.
    Enckell, Merit
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Enochsson, Ola
    Luleå Tekniska Universitet.
    Karoumi (Redaktör), Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Malm, Richard
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Plos, Mario
    Chalmers Tekniska Högskola.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE).
    Täljsten, Björn
    LuleåTekniska Universitet.
    Wiberg, Johan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Ülker, Mahir
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Modern mät- och övervakningsmetodik för bedömning av befintliga broar2007Report (Other academic)
  • 2.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Gamla Årstabron, Utvärdering av verkningssätt hos betongvalv genom mätning och FEM-modellering – Etapp 12005Report (Other academic)
  • 3.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Utvärdering av krafter i Älvsborgsbron genom dynamisk mätning och analys2006Report (Other academic)
    Abstract [sv]

    Föreliggande rapport behandlar mätning och analys av krafter i Älvsborgsbron i Göteborgsom underlag för klassningsberäkning. Den metod som används för bestämning av krafternaär den s.k. vibrationsmetoden där konstruktionselement sätts i svängning och dessas egenfrekvenserbestäms med hjälp av accelerometrar. Med kända egenfrekvenser för t.ex. kablaroch hängare kan krafterna i dessa analyseras fram. Eftersom flera av de aktuella elementenhar egenskaper som inte är enkla att beskriva med hjälp av faktorer som geometriska mått,massa, styvhet och inspänningsförhållanden, har möda lagts ner på att använda så noggrannametoder som möjligt för att kunna bestämma krafter och kraftfördelning. Metoderna beskrivsi rapporten och resultat och noggrannhet diskuteras och bedöms.De resultat som presenteras beträffande krafter bedöms ha en så god noggrannhet som det f.n.går att analysera fram med idag kända någorlunda enkla metoder.

  • 4.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Evaluating cable forces in cable supported bridges using ambient vibration method2006In: The International Conference on Bridge Engineering – Challenges in the 21st Century , November 1-3, 2006, Hong Kong, Hong Kong, 2006Conference paper (Other academic)
    Abstract [en]

    This paper deals with the assessment of cable forces in existing cable supported bridges using the ambient vibration method. A case study of the Älvsborg suspension bridge in Sweden is presented. Dynamic measurements of the backstays and hangers as well as on each strand in one of the splay chambers have been carried out. The measured frequencies are evaluated and calculations of corresponding axial force in the cable structures are performed taking into account the cable sag, boundary conditions and flexural rigidity. Modal analyses have been used to study the shape of vibration and for comparison with finite element models.

  • 5.
    Andersson, Andreas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Full Scale Tests and Structural Evaluation of Soil-Steel Flexible Culverts for High-Speed Railways2012In: Second European conference on Buried Flexible Steel structures Rydzyna April 23rd – 24th 2012, 2012Conference paper (Refereed)
    Abstract [en]

    In this paper, results from full-scale tests on a corrugated soil-steel flexible culvert for railway traffic are presented. The bridge was instrumented with strain gauges, accelerometers and displacement gauges, measuring the response from passing trains. The aim of the measurement campaign was to gain knowledge of the dynamic behaviour due to train induced vibrations, both of the bridge structure and the overlying railway embankment. From the measured data, the load distribution and soil-stiffness can be estimated. The results also serve as input for calibration of numerical models that are used for predicting the behaviour due to high-speed trains.

  • 6.
    Ansell, Anders
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Holmgren, Jonas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Mundt, Elisabeth
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Services Engineering.
    Silfwerbrandt, Johan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Stille, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Soil and Rock Mechanics.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    State-of-the-art och förslag till forskningsprojekt: Drift, underhåll och reparation av trafiktunnlar2007Report (Other academic)
  • 7.
    Ansell, Anders
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Pettersson, Tage
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Envånings pelare och plana pelarsystem2006Report (Other academic)
  • 8.
    Ansell, Anders
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Racutanu, George
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    A Markov approach in estimating the service life of bridge elements in Sweden2002In: 9th International Conference on Durability of Building Materials and Components, CSIRO Australia , 2002, 142-143 p.Conference paper (Other academic)
  • 9.
    Ansell, Anders
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Silfwerbrand, Johan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Krympning, pågjutningar och samverkan hos betongkonstruktioner2006Report (Other academic)
  • 10.
    Ansell, Anders
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Racutanu, George
    Nedbrytningsmodeller för broelement, etapp 12001Report (Other academic)
  • 11. Bagge, N.
    et al.
    Nilimaa, J.
    Blanksvärd, T.
    Täljsten, B.
    Elfgren, L.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Carolin, A.
    Assessment and failure test of a prestressed concrete bridge2017In: Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure - 5th International Symposium on Life-Cycle Engineering, IALCCE 2016, CRC Press, 2017, 1058-1063 p.Conference paper (Refereed)
    Abstract [en]

    Tests have been carried out at service- and ultimate load levels of a 55 year-old prestressed concrete girder bridge. The bridge, located in Kiruna, Sweden, was continuous in five spans with a total length of 121.5 m. The overall aim of the study was to determinate the accuracy of assessment methods for existing structures and to provide procedures for optimized assessment. Before the tests a 2D finite element (FE) analysis was performed to predict the behavior and load-carrying capacity of the bridge. In order to more accurately assess the bridge response a 3D FE model has now been developed. The actual loading history and material properties has been considered in the model. A Life Cycle Cost Assessment of the bridge has also been performed.

  • 12.
    Bayoglu Flener, Esra
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Field testing of a long-span arch steel culvert during backfilling and in service2005In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 1, no 3, 181-188 p.Article in journal (Refereed)
    Abstract [en]

    The paper presents the first part of the in-situ measurements and data analyses for the tests conducted during backfilling and during service of a long-span corrugated steel culvert railway bridge over Skivarpsan, Rydsgard, Sweden. Static and dynamic tests were carried out measuring strains and displacements. Temperature readings were taken along with the measurements. Comparisons of moments during compaction showed that there is good agreement between test results and theoretical values. The theoretical calculation of the rise of the crown during compaction and the crown moments due to live load seem to be conservative, while the theoretical axial forces agree reasonably with the measured axial forces.

  • 13.
    Bayoglu Flener, Esra
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Field testing of a long-span arch corrugated-steel culvert under dynamic and static loads2007In: First European Conference on Burried Flexible Steel Structures, Rydzyna, Archives of Intitute of Civil Engineering, 2007, 25-33 p.Conference paper (Refereed)
    Abstract [en]

    We present the dynamic and static performance of a long-span corrugated steel culvert railway bridge. The culvert has 7 mm plate thickness, and a 11.12 m span. Two sets of tests were carried out with a locomotive by measuring strains and displacements. The dynamic performance of the bridge under different speeds and braking forces were obtained. The loads do not have a visible effect on the crown before the locomotive passes the footing level. The moments at the crown are not affected as much as the moments at the quarter point. Thrusts are not influenced by the speeds as much as the moments. The values for the braking and dynamic tests are quite close to each other. The dynamic amplification factors based on the maximum vertical displacements of the crown increase significantly after 70 km/h (maximum is 1.24).

  • 14.
    Bayoglu Flener, Esra
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Full-scale Testing of Two Corrugated Steel Box Culverts with different crown stiffness2007In: First European Conference on Burried Flexible Steel Structures, Rydzyna, Archives of Intitute of Civil Engineering, 2007, 35-43 p.Conference paper (Refereed)
  • 15. Farkas, György
    et al.
    Jutila, Aarne
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Comparison of Bridge Engineering Studies at Three Technical Universities2005In: 5th AECEF Symposium on Civil Engineering in the Next Decade (ASCEND) - Strategies for Education, Research, Innovation and Practice, 2005Conference paper (Refereed)
  • 16.
    Ilina, Elena
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    An examination of nuclear power plants event reporting in the context of knowledge management2011In: International Journal of Nuclear Knowledge Management, ISSN 1479-540X, Vol. 5, no 4Article in journal (Refereed)
    Abstract [en]

    Challenges to the safety of operating nuclear power plants due to ageing, power uprates, modernizations and a generational exchange in the workforce put a strong focus on knowledge. Both the nuclear regulators and the nuclear plants need to learn more about knowledge management inorder to better manage knowledge. This article aims to promote implementation of knowledge management by taking an example of a regulatory activity for event reporting and examining it in the context of knowledge management. The purpose of the examination is to improve the event reporting activity by studying credibility and usability of produced knowledge, means for its dissemination, specific objectives of consumers of knowledge and other important aspects that are formally emphasized by knowledge management. The most apparent insight that emerges from the examination is that the established event reporting practice is very strong in collection and communication of data about unsafe events but is weaker in creation and sharing of knowledge.

  • 17.
    Ilina, Elena
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Challenges to transport infrastructures and a need for knowledge managementIn: Journal of Infrastructure Systems, ISSN 1076-0342, E-ISSN 1943-555XArticle in journal (Other academic)
    Abstract [en]

    There are clearly many issues of concern for engineers, researchers, managers, politicians and other actors, involved in the complex tasks of operating transport infrastructures. These issues lead, with necessity, to a need to focus on managing knowledge. The purpose of this article is to promote adoption and continuous development of knowledge management theories for the sector of transport infrastructures. To fulfil this goal, this article relates knowledge management theories to the challenges that complicate safe and economic operation of the transport infrastructure facilities. The results offer the practitioners the framework for understanding benefits that result from implementation of knowledge management while illustrating re-examination of the established Swedish Transport Administration’s (STA) computer database, top-level strategic policies and a list of guidelines for implementation of knowledge management.

  • 18.
    Ilina, Elena
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Incident in the Forsmark 1 nuclear power plant in 2006: analysis of communication issues between the plant and the operating company of the power grid2010In: International Journal of Nuclear Knowledge Management, ISSN 1479-540X, Vol. 4, no 4Article in journal (Refereed)
    Abstract [en]

    Previous studies of the Forsmark incident from 25 July 2006 emphasised a need to improve integration and communication between the nuclear plants and the operating company of the power grid. This paper aims to better understand why communication issues occurred and what improvements are needed. For these purposes, communication issues were analysed in the context of knowledge management, more specifically communication theories and activity theory. In particular, the historical background and the role of adverse events are studied.

  • 19.
    Ilina, Elena
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Incident in the Forsmark 1 nuclear power plant in 2006 and knowledge breakdowns2010In: International Journal of Nuclear Knowledge Management, ISSN 1479-540X, E-ISSN 1479-5418, Vol. 4, no 3Article in journal (Refereed)
    Abstract [en]

    The incident in Forsmark nuclear plant in 2006 can be seen not merely as a failure of technology or safety culture but as a failure of knowledge. A previous study of the chain of events that led to the incident revealed that the recent modernization activities in the plant had lead to striking gaps in knowledge and introduction of flaws. This article aims to analyze the exact mechanisms underlying breakdowns in knowledge and to suggest how to prevent re-occurence. The Shannon’s communication theory and the activity theory are used for the purposes.

  • 20.
    Ilina, Elena
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Verification of nuclear power plants safety systems2013In: International Journal of Nuclear Knowledge Management, ISSN 1479-540X, E-ISSN 1479-5418, Vol. 6, no 1, 88-96 p.Article in journal (Refereed)
    Abstract [en]

    Although safety is and has always been the primary objective for the nuclear community, it happens that the established practices for verification of nuclear plants' safety systems fail to provide reliable knowledge. The traditional investigation techniques have proven to be insufficient in their attempts to solve the problems and to prevent new failures. In this paper, difficulties in performing reliable verifications of safety systems are viewed through a lens of knowledge management. The focus is on a transformational development of knowledge from the currently accepted knowledge through acquiring a new knowledge. It is suggested that knowledge activities should be established in the plants for all safety systems to ensure allocation of necessary resources for reliable knowledge.

  • 21. Jutila, Arne
    et al.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    ETSI PROJECT (Stage 1): Bridge Life Cycle Optimization2007Report (Refereed)
  • 22.
    Karoumi, Raid
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Andersson, Andreas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Static and Dynamic Load Testing of the New Svinesund Arch Bridge2006In: The International Conference on Bridge Engineering – Challenges in the 21st Century , November 1-3, 2006, Hong Kong, Hong Kong, 2006Conference paper (Other academic)
    Abstract [en]

    The New Svinesund Bridge at the border between Sweden and Norway has recently been opened to traffic. Due to the uniqueness of design and the importance of the bridge, an extensive long-term monitoring program was inititated. This paper briefly describes the instrumentation of the bridge and focuses on the comprehensive static and dynamic load tests that were performed just before bridge opening. Some interesting results are presented and compared with those predicted by theory.

  • 23.
    Karoumi, Raid
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Bayoglu Flener, Esra
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Dynamic testing of a soil-steel composite railway bridge2010In: Proc. 5th Int. conference on bridge maintenance, safety and management (IABMAS 2010), 2010, 2944-2948 p.Conference paper (Refereed)
    Abstract [en]

    The dynamic response of a long-span arch soil-steel composite railway bridge is studied. The bridge has a span of 11 m and a rise of 4.3 m. Strains, displacements and vertical ballast accelerations were measured during passages of a locomotive at different speeds. The results indicate that the speed of the locomotive has a large influence on the displacements, thrusts and moments. The structure was found to be safe when measured values of moments and thrusts were compared with the live load calculations according to design codes. However, dynamic amplification factors as high as 1.45 were obtained for the moments at the quarter point and this is found to be much greater than the values specified in bridge design codes. Despite this, due to the high damping involved, bridges of this kind are believed to be less sensitive to resonance problems from passing trains.

  • 24.
    Karoumi, Raid
    et al.
    KTH, Superseded Departments, Structural Engineering.
    Darholm, Thomas
    Sundquist, Håkan
    KTH, Superseded Departments, Structural Engineering.
    Betongbågen till Svinesundsbron: en teknisk utmaning för byggare, konstruktörer och ägare2004In: Betong, ISSN 1101-9190, no 6Article in journal (Other academic)
  • 25.
    Karoumi, Raid
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Darholm, Thomas
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Svinesundsbron: ett väldokumentert brobygge2004In: Väg- och Vattenbyggaren, no 2Article in journal (Other academic)
  • 26.
    Karoumi, Raid
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Svinesundsbron, estetisk konstruktion2008In: Betong, ISSN 1101-9190, Vol. 4, 67-69 p.Article in journal (Other academic)
  • 27.
    Karoumi, Raid
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Trillkott, Stefan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Kullberg, Claes
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Kontinuerlig mätning av lagerkrafter på Höga Kusten-bron2006Report (Other academic)
  • 28.
    Malm, Richard
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    James, Gerard
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Monitoring and evaluation of shear crack initiation and propagation in webs of concrete box-girder sections.2006In: International Conference on Bridge Engineering - Challenges in the 21st Century, November 1-3, 2006, Hong Kong., Hong Kong: Civil Division, The Hong Kong Institution of Engineers , 2006Conference paper (Other academic)
  • 29.
    Malm, Richard
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Time-dependent analyses of segmentally constructed balanced cantilever bridges.2010In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 32, no 4, 1038-1045 p.Article in journal (Refereed)
    Abstract [en]

    Segmentally constructed concrete cantilever bridges often exhibit larger deflections than those predicted by the design calculations The slender and long spans in combination with the fact that permanent loads are only partially compensated for by prestressing are reasons for the large deflections that increase during the life time of the bridge, although at a decreasing rate The rate of drying shrinkage may be one reason for the accelerating displacement of cast-in-place bridges The construction of continuous spans instead of introducing joints has both comfort and durability advantages The continuous span is however more complicated to design, and secondary restraint moments due to creep, shrinkage and thermal effects develop at the connection The results of analyses of the stepwise cast-in-place construction of a balanced cantilever bridge with time-dependent material properties show both higher deflect ion than those originally assumed in the design calculations and high stresses in the webs due to stressing of the tendons in the bottom flange The analyses show significant effects of creep during cantilevering and of a non-uniform drying shrinkage rate on the continuous bridge

  • 30.
    Mattsson, Hans-Åke
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Degradation, repair methods and real service life of Soil Steel Composite bridges in Sweden2008In: IABMAS' 08, 2008, 429- p.Conference paper (Refereed)
  • 31.
    Mattsson, Hans-Åke
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    The real service life and repair methods of steel pipe culverts in Sweden2007In: Proceedings of the 1st European Conference on Buried Flexible Steel Structures, 2007, 185-193 p.Conference paper (Refereed)
  • 32.
    Mattsson, Hans-Åke
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    The real service life of road bridges2007In: Proceedings of the Institution of Civil Engineers: Bridge Engineering, ISSN 1478-4629, E-ISSN 1751-7680, Vol. 160, no 4, 173-179 p.Article in journal (Refereed)
    Abstract [en]

    Bridges form an important part of a nation's road system and require large capital investment. The number of bridges in a nation's bridge stock is seldom constant from one year to another as new bridges are built and old structures are demolished. This paper, based on a case study of 1170 bridges demolished in Sweden during a 15-year period (1990-2005), describes the real life span for various types of road bridges. The major reasons for demolition of bridges are addressed and survival analysis for different types of road bridges is introduced.

  • 33.
    Mattsson, Hans-Åke
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Silfwerbrand, Johan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    The real service life and repair costs for bridge edge beams2007In: Restoration of buildings and monuments, ISSN 1864-7251, Vol. 13, no 4, 215-228 p.Article in journal (Refereed)
    Abstract [en]

    Bridges rarely just break down. It is the different structural members of the bridge that slowly degrade the whole structure. One of the most damaged structural members of a bridge is the edge beam. This paper is based on a survey of 260 repaired or replaced edge beams located in a region in Sweden during a 15-year period, 1990-2005. It describes the real life span for edge beams and associated costs to repair them. Survival analysis of replaced edge beams is presented.

  • 34.
    Mattsson, Hans-Åke
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges.
    Stenbeck, Torbjörn
    Swedish Cement and Concrete Research Institute Hifab.
    Bridge demolition and construction rates: inspection data-based indicators2008In: Bridge Structures, ISSN 1573-2487, Vol. 4, no 1, 33-47 p.Article in journal (Refereed)
    Abstract [en]

    Bridge planning and management require precise and continuous information on how the age and condition of various types of bridges evolve. A main objective for a bridge manager is to keep the bridge stock in a good and safe condition. A research question is how many new bridges need to be constructed and old bridges demolished per year to maintain the average age and condition of the bridge stock. In the current study, indicators to give guidance on the replacement ratio were developed from real data. This paper calculates the construction and demolition rates required to maintain the average age for a population of 1800 bridges in a Swedish region. Annual investment and demolition rates, the major reasons to demolish bridges, the resulting actual service life, costs associated with construction, maintenance and repair and the Swedish Road Administration's condition quantifier, lack of capital value (LCV), are addressed.

  • 35. Muravin, Gregory
    et al.
    Sundquist, Håkan
    KTH, Superseded Departments, Structural Engineering.
    Österberg, Elena
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Revealing of age-related deterioration of prestressed reinforced concrete containments in   nuclear power plants - Requirements and NDT methods2004In: 4th International Conference on NDE in relation to structural integrity for nuclear and pressurised components, 2004Conference paper (Refereed)
  • 36.
    Pettersson, Lars
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Flener, Esra Bayoglu
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Design of Soil-Steel Composite Bridges2015In: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 25, no 2, 159-172 p.Article in journal (Refereed)
    Abstract [en]

    The research work presented in this paper deals with what are commonly known as soil-steel flexible culverts. The word culvert is, however, usually associated with small pipes in road embankments. Over the years, the flexible culverts have grown bigger and today they are what one could call bridges; they are not just culverts anymore. A more proper name today would therefore be Soil-Steel Composite Bridges. This explains the title of the paper. The research work has been ongoing for more than 30 years at the Department of Civil and Architectural Engineering, Division of Structural Engineering and Bridges, at KTH Royal Institute of Technology in Stockholm, Sweden. Realizing that spans have grown larger and heights of cover smaller, the aim was to develop a design method that could be used in everyday design work. The design method developed, based on theoretical studies as well as several full scale tests, is today a code requirement in Sweden, Finland, and Norway and is also in use in several other countries in Europe. This paper describes the design method itself and the development behind it as well as ongoing research and planned future developments.

  • 37.
    Pettersson, Lars G.
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Development of the Swedish Handbook for Buried Flexible Culverts2007In: European Conference on Buried Flexible Steel Structures, 2007, 195-203 p.Conference paper (Refereed)
    Abstract [en]

    The development of the Swedish handbook on design of buried metal flexible culverts started in 1983 with the Swedish National Road Administration highlighting the need for a design method capable of handling larger spans and small heights of cover. A research project was started at the Royal Institute of Technology in Stockholm and a first full-scale test on a 6,1 m pipe arch culvert having a 1,0 m height of cover was performed. At the same time theoretical studies of different international design methods was started. A second full scale test was performed on a 6,0 m span pipearch culvert varying the height of cover. The design handbook was presented in 2000. Based on the Soil Culvert Interaction-method developed by Duncan the design method allow the designer to calculate both thrust and bending moments in a large variety of culvert profiles and taking different soil conditions into consideration. Both road and railroad live load can be used. Several full scale tests have been performed including the so-called BoxCulvert. A revised handbook has been presented in 2006 including the BoxCulvert extended method. The Swedish bridge codes, both for road and railroad bridges, require the use of the handbook method in the design of buried metal flexible culverts.

  • 38.
    Pettersson, Lars
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Design of soil steel composite bridges2014Report (Other academic)
    Abstract [en]

    Preface to the fifth edition of the manual

    This fifth edition has been updated regarding the following points.

    The manual is now fully based on the Eurocodes. A new section on fatigue design has been added. This section is based on new testsand new research. Notations are changed to comply with the rules in Eurocode and the ISO Standards. The text for checking the structural capacity of existing structures is completed andrevised.MSc and PhD student Amer Wadi has developed new diagrams for fatigue design, checkingthe capacity of existing structures and also made some revisions of the design load diagrams. He has also helped in editing of the report.

    Stockholm, October 2014 Lars Pettersson Håkan Sundquist

  • 39.
    Roth, Thomas
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Silfwerbrand, Johan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Lifetime Issues Concerning Prestressing Steel in Concrete Structures2005Report (Other academic)
  • 40.
    Safi, Mohammed Abu
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Cost-Efficient Procurement of Bridge Infrastructures by Incorporating Life-Cycle Cost Analysis with Bridge Management Systems2015In: Journal of Bridge Engineering, ISSN 1084-0702, E-ISSN 1943-5592, Vol. 20, no 6, 04014083Article in journal (Refereed)
    Abstract [en]

    Life-cycle cost analysis (LCCA) has recognized potential for rationalizing bridge procurement, but its use in this context is far from systematic. The integration of LCCA findings in decisions is often far from robust. Furthermore, although most bridge management systems (BMSs) include databases of relevant information, agencies do not use them effectively to improve future bridge-investment decisions. This paper introduces a comprehensive approach to help agencies exploit their BMSs to procure the most cost-efficient bridge design through fair design-build (D-B) tendering processes. The approach incorporates use of a novel LCCA technique, LCC added-value analysis, that can be conveniently integrated with public agencies' established procurement procedures and maintains contractors' freedoms in D-B processes. The proposed approach allows bridge procurers to establish monetary LCC-efficient benchmarks and embed them in tender documents as core specifications. Hence the lowest LCC bid, rather than the lowest bid in initial investment terms, can be used as the contract award criterion. The Swedish Transport Administration has recently procured several bridges using the approach, thereby gaining considerable cost savings. A case study provides insights into various aspects of bridges' LCC and illustrates analytical steps that other agencies could apply in bridge procurement. The study shows that the use of D-B processes, together with the lowest LCC bid as the contract award criterion, afford greater opportunities to consider LCC aspects in bridge procurement, rather than relying on traditional contracts and the lowest-bid criterion.

  • 41.
    Safi, Mohammed
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Applications of life-cycle costing for bridges and integration with bridge management systemsIn: Civil Engineering and ArchitectureArticle in journal (Refereed)
    Abstract [en]

    Many countries are using bridge management systems(BMSs) as the main toll for the effective management of their bridges. Althoughmany BMSs contain some forms of life-cycle cost analysis (LCCA), the use of LCCAin bridge engineering is scarce and LCCA has mainly been applied to supportdecisions related to existing bridges. This paper discuss the need of a BMSwith an integrated LCCA tool that can assist decision makers at all levels andwithin all phases in selecting the most cost-effective solution from an arrayof applicable alternatives. The paper introduces the Swedish Bridge and TunnelManagement System (BaTMan). A comprehensive LCCA implementation scheme will beillustrated, taking into account the bridge investment and management processin Sweden. The basic LCCA analysis tools as well as other helpful techniquesare addressed. A real case study is presented to demonstrate the recentimprovement of BaTMan particularly in the function of specifying the most-costeffective bridge repair strategy. The bridge user cost is included in the LCCA.The parameters that can influence the final decision are addressed andsensitivity analyses to study their impacts are performed.

  • 42.
    Safi, Mohammed
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Procurement of the most cost-efficient bridge through incorporating LCCA with BMSs: Case-Study of the Karlsnäs Bridge in SwedenIn: Journal of Bridge Engineering, ISSN 1084-0702, E-ISSN 1943-5592Article in journal (Other academic)
    Abstract [en]

    Life-cycle cost analysis (LCCA) has recognized potential for rationalizing bridge procurement, but its use in this context is far from systematic and the integration of LCCA findings in decisions is often far from robust. Furthermore, although most bridge management systems (BMSs) include databases of relevant information, agencies do not use them effectively to improve future bridge investment decisions. This paper introduces a comprehensive approach for agencies to exploit their BMS to procure the most cost-efficient bridge design through fair design-build (D-B) tendering processes. The approach incorporates use of a novel LCCA technique, LCC Added-Value Analysis, that can be conveniently integrated with public agencies’ established procurement procedures and maintains contractors’ freedoms in D-B processes. The proposed approach allows bridge procurers to establish monetary LCC-efficient benchmarks and embed them in tender documents as core specifications. Hence the lowest LCC bid can be employed as the contract award criterion, rather the lowest bid in initial investment terms. The Swedish Transport Administration has recently procured several bridges using the approach, thereby gaining considerable cost savings. A presented case-study provides insights into various aspects of bridges’ LCC and illustrates analytical steps that other agencies could apply in bridge procurement.

  • 43.
    Safi, Mohammed
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Racutanu, G.
    Bridge management system with an integrated comprehensive LCC tool2012In: fib Symposium 2012: Concrete Structures for Sustainable Community - Proceedings, 2012, 345-348 p.Conference paper (Refereed)
    Abstract [en]

    Although many bridge management systems (BMSs) contain some forms of life-cycle costing (LCC), the use of LCC in bridge engineering is scarce. This paper presents a comprehensive integrated LCC implementation scheme, taking into account the bridge investment and management process in Sweden. The Swedish Bridge and Tunnel Management System (BaTMan) will be introduced as a case study. The paper clarifies how a BMS with an integrated comprehensive LCC tool can assist decision makers at all levels and within all phases in selecting the most cost-effective alternative.

  • 44.
    Safi, Mohammed
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Racutanu, G.
    Integration of life-cycle cost analysis with bridge management systems: case study of the Swedish bridge and tunnel management system.2012In: Transportation Research Record, ISSN 0361-1981, E-ISSN 2169-4052, no 2292, 125-133 p.Article in journal (Refereed)
    Abstract [en]

    Many countries use bridge management systems (BMSs), and many of these systems involve some form of life-cycle cost (LCC) analysis. Use of LCC analysis in bridge engineering is rare, however; the technique has been applied primarily in the operation phase to support decisions about bridges that already exist. Yet LCC analysis can be applied across the life of a bridge. This paper introduces the Swedish Bridge and Tunnel Management System (BaTMan). A comprehensive, integrated LCC implementation scheme takes into account the bridge investment and management processes in Sweden. The basic economic analytical tools as well as other helpful LCC analysis techniques are described. A case study demonstrates improvements in BaTMan as a factor in the decision whether to repair or to replace a bridge. Cost records for 1,987 bridges were used as input data in the case study. On the basis of the same records, the average real and anticipated initial costs of various bridge types in Sweden are presented schematically.

  • 45.
    Safi, Mohammed
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Karoumi, Raid
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Racutanu, George
    The Swedish Transport Administration, Trafikverket, Eskilstuna, Sweden.
    Development of the Swedish Bridge Management System by Upgrading and Expanding the Use of LCC2013In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 9, no 12, 1240-1250 p.Article in journal (Refereed)
    Abstract [en]

    Although many bridge management systems (BMSs) contain some forms of life-cycle costing (LCC), the use of LCC in bridge engineering is scarce. LCC in many BMSs has mainly been applied within the bridge operation phase to support decisions related to existing bridges. LCC has several useful applications within the bridge entire life, from cradle to grave. This paper introduces the Swedish Bridge and Tunnel Management System (BaTMan). A comprehensive integrated LCC implementation schema will be illustrated, taking into account the bridge investment and management process in Sweden. The basic economic analytical tools as well as other helpful LCC techniques are addressed. A real case study is presented to demonstrate the recent improvement of BaTMan practically in the function of whether to repair or to replace a bridge.  Cost records for 2,508 bridges are used as input data in the presented case study. Considering the same records, the average real and anticipated initial costs of different bridge types in Sweden will be schematically presented.

  • 46.
    Safi, Mohammed
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
    Racutanu, George
    The Swedish Transport Administration, Travikverket, Eskilstuna, Sweden.
    Life-Cycle Costing Integration with Bridge Management Systems2011In: Proceedings of the Institution of Civil Engineers: Bridge Engineering, ISSN 1478-4629, E-ISSN 1751-7680Article in journal (Other academic)
    Abstract [en]

    The implementation of a bridge design proposal, as well as an individual bridge structural member, generally has several alternatives to choose from. The alternatives may provide the same required function. However, each of them may has different specifications concerning its initial costs, anticipated service life, required future repairs and impacts on traffic flow during repair works. Moreover, the cost categories associated with the various alternatives are incurred at varying points in time. Life-cycle costing (LCC) is an appropriate tool that can be used to specify the most cost-effective alternative taking into account all parameters. Most of the reported LCC applications for bridges were far from ideal and were content with deterministic estimates of life cycle cost instead of using sensitivity analysis. This paper briefly describes the various bridge investment phases and demonstrates the possible applications of LCC regarding them. The economic analysis tools that LCC is based on are presented. A detailed practical example to illustrate the LCC application for bridges during design and construction phases is also presented, taking into account the bridge user costs. The analysis results highlight the great feasibility and possibility of LCC implementations for bridges.

  • 47.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Några frågor aktuella för hängbroars dynamiska egenskaper2006Report (Other academic)
  • 48.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Punching of concrete bridge decks and footings with a special reference to scale effect and uneven moment distribution2006In: The International Conference on Bridge Engineering: Challenges in the 21st Century, 2006Conference paper (Refereed)
  • 49.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Punching of concrete slabs with un-bonded tendons and different configurations of shear reinforcement2005In: XIX Symposium on Nordic Concrete Research & Development, 2005Conference paper (Refereed)
  • 50.
    Sundquist, Håkan
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Design and Bridges (name changed 20110630).
    Punching Research at the Royal Institute of Technology (KTH) in Stockholm2005In: American Concrete Institute, Special Publication SP-232, Vol. 232, 229-256 p.Article in journal (Refereed)
    Abstract [en]

    At the department of Structural Engineering, formerly the Department ofBuilding Statics and Structural Engineering and the Department of Bridge Structures,Royal Institute of Technology in Stockholm (KTH), now merged into the Department ofArchitectural and Civil Engineering, research on punching of concrete slabs and plateshas been conducted for many years. The first report published in English was thefamous “Punching of Concrete Slabs without Shear Reinforcement” Nylander &Kinnunen (1961). [22] Since then, a large number of punching tests have beenconducted, many of these are unpublished or only published in Swedish. This paper willsummarize some of the tests performed and also present new findings in this importantfield.

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