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Publications (10 of 156) Show all publications
Zangeneh, A., Svedholm, C., Andersson, A., Pacoste, C. & Karoumi, R. (2018). Identification of soil-structure interaction effect in a portal frame railway bridge through full-scale dynamic testing. Engineering structures, 159, 299-309
Open this publication in new window or tab >>Identification of soil-structure interaction effect in a portal frame railway bridge through full-scale dynamic testing
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2018 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 159, p. 299-309Article in journal (Refereed) Published
Abstract [en]

This paper is devoted to identify the effect of soil-structure interaction on the dynamic response of,a portal frame railway bridge. The study aims to validate the accuracy of numerical models in evaluating the dynamic stiffness and modal properties of the bridge-soil system. To achieve this aim, a controlled vibration test has been performed on a full-scale portal frame bridge to determine the modal properties of the system through measuring Frequency Response Functions. The results of the dynamic test provide reference data for FE model calibration as well as valuable information about the dynamic behavior of this type of bridges. Using the experimental data, an FRF-based model updating procedure was used to calibrate a full 3D solid model involving the entire bridge track-soil system. Both measured and computed responses identify the substantial contribution of the surrounding soil on the global damping of the system and highlight the importance of the soil-structure interaction on the dynamic response of this type of bridges. The identified modal damping ratio corresponding to the fundamental bending mode of the studied bridge was nearly 5 times higher than the recommended design values. A simplified model for the surrounding soil was also proposed in order to attain a less complicated model appropriate for practical design purposes.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2018
Keywords
Portal frame bridge, Full-scale dynamic test, Soil-structure interaction, Model updating, Frequency response functions
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-223776 (URN)10.1016/j.engstruct.2018.01.014 (DOI)000425203000024 ()2-s2.0-85044636227 (Scopus ID)
Funder
Swedish Research Council FormasSwedish Transport Administration
Note

QC 20180307

Available from: 2018-03-07 Created: 2018-03-07 Last updated: 2018-03-15Bibliographically approved
Veganzones Muñoz, J. J., Pacoste-Calmanovici, C., Pettersson, L. & Karoumi, R. (2018). Influence of Edge Beam on Behavior of Bridge Overhangs. ACI Structural Journal, 115(4), 957-970
Open this publication in new window or tab >>Influence of Edge Beam on Behavior of Bridge Overhangs
2018 (English)In: ACI Structural Journal, ISSN 0889-3241, E-ISSN 1944-7361, Vol. 115, no 4, p. 957-970Article in journal (Refereed) Published
Abstract [en]

Recently, a solution without edge beam was presented to reduce life cycle costs in bridges. Because bridge edge beams contribute to an increased load capacity of overhang slabs, the loss of robustness of the overhang should be investigated. The aim of this paper is to investigate and quantify the influence of the edge beam on the structural behavior of overhang slabs. A nonlinear, three-dimensional (3-D) finite element model was developed and validated using experimental data. Failure modes as well as the shearing and bending moment capacities were determined. An assessment of existing design methods is also presented. The results show the edge beam has a significant contribution to the load capacity. Specifically, the shear force is more efficiently distributed for concentrated loads near the free edge. Design methods should be reviewed to account for the edge beam's influence in the load-bearing capacity of the overhang slab.

Place, publisher, year, edition, pages
American Concrete Institute, 2018
Keywords
bending moment, bridge edge beam, bridge overhang, cantilever, distribution width, failure mode, finite element, shear force, structural analysis
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-232233 (URN)10.14359/51702225 (DOI)000436975000005 ()2-s2.0-85049724986 (Scopus ID)
Note

QC 20180720

Available from: 2018-07-20 Created: 2018-07-20 Last updated: 2018-07-25Bibliographically approved
Du, G., Pettersson, L. & Karoumi, R. (2018). Soil-steel composite bridge: An alternative design solution for short spans considering LCA. Journal of Cleaner Production, 189, 647-661
Open this publication in new window or tab >>Soil-steel composite bridge: An alternative design solution for short spans considering LCA
2018 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 189, p. 647-661Article in journal (Refereed) Published
Abstract [en]

In a bridge project, several alternative design solutions can be functionally equivalent for the designated location. Today's bridge constructions highly rely on the non-renewable resources, the consumption of fossil fuels, and the intensive usage of concrete. This urges designers to explore the new design options to mitigate the associated environmental burdens. When comparing to the concrete slab frame bridges (CFB), the soil-steel flexible culverts (or soil-steel composite bridge, SSCB) show advantages in ease erection, low maintenance as well as the competitive cost. However, its environmental performance has never been studied. This paper intends to compare the environmental performance of these two bridge types through the whole life cycle, based on 8 selected cases in Sweden. Unlike previous studies only limited to few impact indicators, this study comprehensively covers a wide range of indicators: including eleven types of mid-point impact categories, the cumulative energy demand (CED) and the associated cost. The construction phase, which seldom included previously, is a specific focus in this paper. The results find that: 1) the SSCBs show advantages over the CFBs in most of the investigated indicators; 2) the construction phase, when explicitly evaluated, may take up to 34% of the total life cycle environmental burdens; 3) the environmental performance of a bridge is closely linked with the bridge type selection, multiple indicators in the environmental domain, designers' preference, the construction phase, as well as the time schedule constraints.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2018
Keywords
Soil-steel composite bridge, Steel flexible culvert, Life cycle assessment, Bridge LCA, CO2 emission, Sustainable construction, Global warming
National Category
Environmental Management
Identifiers
urn:nbn:se:kth:diva-231177 (URN)10.1016/j.jclepro.2018.04.097 (DOI)000432771000058 ()2-s2.0-85047923889 (Scopus ID)
Note

QC 20180718

Available from: 2018-07-18 Created: 2018-07-18 Last updated: 2018-07-18Bibliographically approved
Cahill, P., Hazra, B., Karoumi, R., Mathewson, A. & Pakrashi, V. (2018). Vibration energy harvesting based monitoring of an operational bridge undergoing forced vibration and train passage. Mechanical systems and signal processing, 106, 265-283
Open this publication in new window or tab >>Vibration energy harvesting based monitoring of an operational bridge undergoing forced vibration and train passage
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2018 (English)In: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 106, p. 265-283Article in journal (Refereed) Published
Abstract [en]

The application of energy harvesting technology for monitoring civil infrastructure is a bourgeoning topic of interest. The ability of kinetic energy harvesters to scavenge ambient vibration energy can be useful for large civil infrastructure under operational conditions, particularly for bridge structures. The experimental integration of such harvesters with full scale structures and the subsequent use of the harvested energy directly for the purposes of structural health monitoring shows promise. This paper presents the first experimental deployment of piezoelectric vibration energy harvesting devices for monitoring a fullscale bridge undergoing forced dynamic vibrations under operational conditions using energy harvesting signatures against time. The calibration of the harvesters is presented, along with details of the host bridge structure and the dynamic assessment procedures. The measured responses of the harvesters from the tests are presented and the use the harvesters for the purposes of structural health monitoring (SHM) is investigated using empirical mode decomposition analysis, following a bespoke data cleaning approach. Finally, the use of sequential Karhunen Loeve transforms to detect train passages during the dynamic assessment is presented. This study is expected to further develop interest in energy harvesting based monitoring of large infrastructure for both research and commercial purposes.

Place, publisher, year, edition, pages
Academic Press, 2018
Keywords
Energy harvesting, Bridge structure, Full-scale testing, Structural health monitoring, Empirical mode decomposition, Scalogram, Sequential Karhunen Loeve transform, Hilbert transform
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-224670 (URN)10.1016/j.ymssp.2018.01.007 (DOI)000426229100018 ()2-s2.0-85041557441 (Scopus ID)
Note

QC 20180322

Available from: 2018-03-22 Created: 2018-03-22 Last updated: 2018-03-22Bibliographically approved
Neves, A., González, I., Leander, J. & Karoumi, R. (2017). Structural health monitoring of bridges: a model-free ANN-based approach to damage detection. Journal of Civil Structural Health Monitoring, 7(5), 689-702
Open this publication in new window or tab >>Structural health monitoring of bridges: a model-free ANN-based approach to damage detection
2017 (English)In: Journal of Civil Structural Health Monitoring, ISSN 2190-5452, Vol. 7, no 5, p. 689-702Article in journal (Refereed) Published
Abstract [en]

As civil engineering structures are growing in dimension and longevity, there is an associated increase in concern regarding the maintenance of such structures. Bridges, in particular, are critical links in today’s transportation networks and hence fundamental for the development of society. In this context, the demand for novel damage detection techniques and reliable structural health monitoring systems is currently high. This paper presents a model-free damage detection approach based on machine learning techniques. The method is applied to data on the structural condition of a fictitious railway bridge gathered in a numerical experiment using a three-dimensional finite element model. Data are collected from the dynamic response of the structure, which is simulated in the course of the passage of a train, considering the bridge in healthy and two different damaged scenarios. In the first stage of the proposed method, artificial neural networks are trained with an unsupervised learning approach with input data composed of accelerations gathered on the healthy bridge. Based on the acceleration values at previous instants in time, the networks are able to predict future accelerations. In the second stage, the prediction errors of each network are statistically characterized by a Gaussian process that supports the choice of a damage detection threshold. Subsequent to this, by comparing damage indices with said threshold, it is possible to discriminate between different structural conditions, namely between healthy and damaged. From here and for each damage case scenario, receiver operating characteristic curves that illustrate the trade-off between true and false positives can be obtained. Lastly, based on the Bayes’ Theorem, a simplified method for the calculation of the expected total cost of the proposed strategy, as a function of the chosen threshold, is suggested.

Place, publisher, year, edition, pages
Springer Verlag, 2017
Keywords
Artificial neural networks, Bayes’ theorem, Damage detection, Model-free-based method, Probability-based expected cost, Receiver operating characteristic curve, Statistical model development, Structural health monitoring, Chemical sensors, Economic and social effects, Finite element method, Learning algorithms, Learning systems, Neural networks, Numerical methods, Civil engineering structures, Damage detection technique, Expected costs, Model free, Receiver operating characteristic curves, Statistical modeling, Structural health monitoring systems, Three dimensional finite element model
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-227063 (URN)10.1007/s13349-017-0252-5 (DOI)2-s2.0-85034638701 (Scopus ID)
Note

QC 20180517

Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved
Rådeström, S., Ülker-Kaustell, M., Andersson, A., Tell, V. & Karoumi, R. (2016). Application of fluid viscous dampers to mitigate vibrations of high-speed railway bridges. International Journal of Rail transportation, 1-16
Open this publication in new window or tab >>Application of fluid viscous dampers to mitigate vibrations of high-speed railway bridges
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2016 (English)In: International Journal of Rail transportation, ISSN 2324-8378, E-ISSN 2324-8386, p. 1-16Article in journal (Refereed) Published
Abstract [en]

Several bridges along the Bothnia railway line in Sweden do not fulfil the Eurocode requirements regarding the maximum vertical bridge deck acceleration. The aim of this study is to investigate the possibility of reducing the acceleration of one of these bridges to an acceptable level by using post-installed viscous dampers. The bridge-damper system is described by a single-degree-of-freedom model. Assuming that the dampers do not change the mode shapes of the bridge, the model is further generalized to include higher order bending modes. The dampers are connected between the bottom surface of the bridge deck and the abutments. This creates an eccentricity between the connection point of the dampers and the neutral axis of the bridge, which is found to have a significant influence on the efficiency of the dampers. The results of this study also indicate that the proposed retrofit method can reduce the accelerations to an acceptable level.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2016
Keywords
fluid viscous dampers, high-speed trains, passive damping, railway bridges, resonance, Structural dynamics
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-197137 (URN)10.1080/23248378.2016.1209444 (DOI)000396621000004 ()2-s2.0-84978485268 (Scopus ID)
Note

QC 20161213

Available from: 2016-12-13 Created: 2016-11-30 Last updated: 2017-11-29Bibliographically approved
Jaksic, V., Mandic, D. P., Karoumi, R., Basu, B. & Pakrashi, V. (2016). Estimation of nonlinearities from pseudodynamic and dynamic responses of bridge structures using the Delay Vector Variance method. Physica A: Statistical Mechanics and its Applications, 441, 100-120, Article ID 16342.
Open this publication in new window or tab >>Estimation of nonlinearities from pseudodynamic and dynamic responses of bridge structures using the Delay Vector Variance method
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2016 (English)In: Physica A: Statistical Mechanics and its Applications, ISSN 0378-4371, E-ISSN 1873-2119, Vol. 441, p. 100-120, article id 16342Article in journal (Refereed) Published
Abstract [en]

Analysis of the variability in the responses of large structural systems and quantification of their linearity or nonlinearity as a potential non-invasive means of structural system assessment from output-only condition remains a challenging problem. In this study, the Delay Vector Variance (DVV) method is used for full scale testing of both pseudo-dynamic and dynamic responses of two bridges, in order to study the degree of nonlinearity of their measured response signals. The DVV detects the presence of determinism and nonlinearity in a time series and is based upon the examination of local predictability of a signal. The pseudo-dynamic data is obtained from a concrete bridge during repair while the dynamic data is obtained from a steel railway bridge traversed by a train. We show that DVV is promising as a marker in establishing the degree to which a change in the signal nonlinearity reflects the change in the real behaviour of a structure. It is also useful in establishing the sensitivity of instruments or sensors deployed to monitor such changes.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Bridge, Condition monitoring, Delay Vector Variance (DVV), Instrumentation, Signal nonlinearity, System identification, Bridges, Identification (control systems), Bridge structures, Degree of non-linearity, Delay vector variances, Full-scale testing, Pseudo-dynamics, Steel railway bridge, Structural systems, Dynamic response
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-177739 (URN)10.1016/j.physa.2015.08.026 (DOI)2-s2.0-84941928815 (Scopus ID)
Note

QC 20151130

Available from: 2015-11-30 Created: 2015-11-25 Last updated: 2017-12-01Bibliographically approved
Du, G., Pettersson, L. & Karoumi, R. (2016). Evaluating the life cycle environmental impact of short span bridges. In: IABSE Congress Stockholm, 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Paper presented at 19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 21 September 2016 through 23 September 2016 (pp. 1701-1707). International Association for Bridge and Structural Engineering (IABSE)
Open this publication in new window or tab >>Evaluating the life cycle environmental impact of short span bridges
2016 (English)In: IABSE Congress Stockholm, 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, International Association for Bridge and Structural Engineering (IABSE) , 2016, p. 1701-1707Conference paper, Published paper (Refereed)
Abstract [en]

Bridge infrastructure consumes large amount of energy and raw materials, leading to considerable environmental burdens. The traditional infrastructure construction prioritizes its technical and economic viability. In recent years, the society devotes an ever-increased attention to the environmental impact of the construction sector. Life cycle assessment (LCA) is a systematic method for assessing the environmental impact of products and systems, but its application in bridges is scarce. In Swede, most of the bridges are short spans and the type of concrete slabframe bridge (CFB) accounts for a large share. Soil steel composite bridge (SSCB) is a functional equivalent solution for CFB. In order to mitigate the environmental burdens of short span bridges, this paper performed a comparative LCA study between these two types of bridge. The results indicate that the initial material consumption is critical through the whole life cycle. The case of SSCB shows preferable environmental performance over CFB in most of the examined indicators.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering (IABSE), 2016
Keywords
Climate change, CO2 emission, Concrete slab frame bridge, Global warming, LCA, Life cycle assessment, Soil steel composite bridge, Soil steel flexible culverts, Sustainable construction, Bridges, Carbon dioxide, Composite bridges, Concrete slabs, Concretes, Construction industry, Environmental impact, Environmental management, Soils, Steel bridges, Sustainable development, Bridge infrastructure, Environmental performance, Infrastructure construction, Life Cycle Assessment (LCA), Life-cycle environmental impact, Slab frames, Steel composite bridges, Life cycle
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-216882 (URN)2-s2.0-85018989725 (Scopus ID)9783857481444 (ISBN)
Conference
19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 21 September 2016 through 23 September 2016
Note

 QC 20171107

Available from: 2017-11-07 Created: 2017-11-07 Last updated: 2018-03-06Bibliographically approved
Zäll, E., Karoumi, R., Ülker-Kaustell, M. & Andersson, A. (2016). Evaluation of load model for crowd-induced vibrations of footbridges. In: IABSE Congress Stockholm, 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Paper presented at 19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 21 September 2016 through 23 September 2016 (pp. 65-72). International Association for Bridge and Structural Engineering (IABSE)
Open this publication in new window or tab >>Evaluation of load model for crowd-induced vibrations of footbridges
2016 (English)In: IABSE Congress Stockholm, 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, International Association for Bridge and Structural Engineering (IABSE) , 2016, p. 65-72Conference paper, Published paper (Refereed)
Abstract [en]

Due to a trend in designing light and slender structures, many modern footbridges are prone to excessive vibrations. Severely vibrating footbridges can give rise to discomfort for the pedestrians. Therefore, during the last decades, pedestrian-induced vibrations of footbridges have become a subject of great interest. In this study, the performance of a coupled crowd-structure model, where the bridge is described using its first two modes of vibrations and each pedestrian is described as a moving mass-spring-damper system, in combination with a walking load, is evaluated. The model is used to estimate vertical deck accelerations of a real footbridge which is known to be susceptible to vibrations, and the results are then compared to measurements. The model performs satisfactory in the time domain, but poorly in the frequency domain, which is concluded to be mainly due to discrepancies in the simulated load compared to the measured load.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering (IABSE), 2016
Keywords
Footbridge, Load model, Pedestrian-induced vibrations, Walking load, Footbridges, Frequency domain analysis, Sustainable development, Vibrations (mechanical), Frequency domains, Induced vibrations, Load modeling, Measured loads, Slender structures, Structure modeling, Walking loads, Structural design
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-216887 (URN)2-s2.0-85019004700 (Scopus ID)9783857481444 (ISBN)
Conference
19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, 21 September 2016 through 23 September 2016
Note

Conference code: 127207; Export Date: 24 October 2017; Conference Paper; Correspondence Address: Zäll, E.; KTH Royal Institute of TechnologySweden; email: ezall@kth.se. QC 20171031

Available from: 2017-10-31 Created: 2017-10-31 Last updated: 2018-05-24Bibliographically approved
Wadi, A., Pettersson, L. & Karoumi, R. (2016). Flexible culverts in sloping terrain: Numerical simulation of avalanche load effects. Cold Regions Science and Technology, 124, 95-109
Open this publication in new window or tab >>Flexible culverts in sloping terrain: Numerical simulation of avalanche load effects
2016 (English)In: Cold Regions Science and Technology, ISSN 0165-232X, E-ISSN 1872-7441, Vol. 124, p. 95-109Article in journal (Refereed) Published
Abstract [en]

Avalanche protection concrete structures are expensive and their construction period is often influenced by the climatological conditions at site, which could result in prolonging the erection process and increase its associated costs. Given the short construction time of flexible culverts, such structures can be a cost-effective alternative to traditional protective measures. This article investigates the performance of flexible culverts - often referred to as soil-steel composite bridges (SSCB) - when constructed in sloping topography under avalanche loads. A number of 2D finite element models were created to simulate two case studies composed of a pipe arch and a high-profile arch. The models were generated to investigate the effect of soil cover depth, the avalanche proximity, and the change in soil support conditions around the conduit. The aim was to perceive and understand the changes in deformations and sectional forces under defined avalanche loads. The results enable to realise the effect of shallow soil covers in the pronounced change in bending moments due to avalanches. The proximity of avalanche deviation point has a great influence on the structural performance, though increasing the soil cover depth could considerably help in reducing the bending moments resulting from avalanches. It is also found that the downhill soil support configuration has a substantial effect on the flexural response of the structure.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Flexible culvert, Soil-steel composite bridge, Sloping terrain, Finite element model, Avalanche load, Snowshed
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-184521 (URN)10.1016/j.coldregions.2016.01.003 (DOI)000371903000009 ()2-s2.0-84956901137 (Scopus ID)
Note

QC 20160407

Available from: 2016-04-07 Created: 2016-04-01 Last updated: 2017-11-30Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-5447-2068

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