Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 168) Show all publications
Neves, A. C., Leander, J., Gonzalez, I. & Karoumi, R. (2019). An approach to decision-making analysis for implementation of structural health monitoring in bridges. Structural Control and Health Monitoring: The Bulletin of ACS, 26(6), Article ID e2352.
Open this publication in new window or tab >>An approach to decision-making analysis for implementation of structural health monitoring in bridges
2019 (English)In: Structural Control and Health Monitoring: The Bulletin of ACS, ISSN 1545-2255, E-ISSN 1545-2263, Vol. 26, no 6, article id e2352Article in journal (Refereed) Published
Abstract [en]

Adverse situations such as prolonged downtime of a structure, unnecessary inspections, expensive allocation of personal and equipment, deficient structural performance, or failure can be avoided by using structural health monitoring (SHM). Enhanced structural safety is the leading reason for its implementation, but one of the remaining obstacles to fully implement SHM systems deals with justifying their economic benefit. At any point in time, the preference towards one particular action depends on factors such as the probability of the triggered events and their consequences. All the possible decisions and relevant information can be illustrated by decision tree models, and the optimal decision corresponds to the one with the highest utility. Applying the Bayesian Theorem, the assumed prior probabilities of the structural state are updated in the light of new information provided by a system and the optimal decision is revised. This paper proposes a dynamic decision-making framework to manage civil engineering structures, where the ultimate goal is to achieve greater overall economy without jeopardizing safety. This paper covers a case study of a bridge where the optimal SHM and maintenance decisions are determined in the context of different scenarios in which the event probabilities and associated costs are made-up.

Place, publisher, year, edition, pages
JOHN WILEY & SONS LTD, 2019
Keywords
Bayesian decision analysis, bridge structural health monitoring, event trees, expected utility theory, value of information
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-252589 (URN)10.1002/stc.2352 (DOI)000467742400005 ()2-s2.0-85063567974 (Scopus ID)
Note

QC 20190611

Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-06-25Bibliographically approved
Neves, A. C., Leander, J., Karoumi, R. & González Silva, I. (2019). Cost-based optimization of the performance of a damage detection system. In: Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018. Paper presented at 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018, 28 October 2018 through 31 October 2018 (pp. 2103-2112). CRC Press/Balkema
Open this publication in new window or tab >>Cost-based optimization of the performance of a damage detection system
2019 (English)In: Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018, CRC Press/Balkema , 2019, p. 2103-2112Conference paper, Published paper (Refereed)
Abstract [en]

Situations such as the collapse of civil engineering structures can be avoided if Structural Health Monitoring (SHM) systems can detect early potential failures and timely withdraw the structure from service ahead of a likely disaster. Structural safety is the leading reason for the implementation of SHM but also noteworthy is the cost reduction associated with routine maintenance and inspection. One of the remaining obstacles to fully implement SHM systems in our infrastructure deals with justifying their economic advantage. This paper proposes a rational framework for the use of SHM in the decision making process regarding the maintenance of civil engineering structures, based on the optimal setup of the damage detection system that yields the minimum associated deployment cost. Concepts such as Bayesian Theorem, Damage Index and Receiver Operating Characteristic curve are used in the proposed framework.

Place, publisher, year, edition, pages
CRC Press/Balkema, 2019
Keywords
Cost reduction, Damage detection, Decision making, Life cycle, Structural health monitoring, Structures (built objects), Civil engineering structures, Cost-based optimization, Damage detection systems, Decision making process, Economic advantages, Receiver operating characteristic curves, Routine maintenance, Structural health monitoring (SHM), Cost engineering
National Category
Construction Management
Identifiers
urn:nbn:se:kth:diva-252102 (URN)000471120402048 ()2-s2.0-85063957299 (Scopus ID)
Conference
6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018, 28 October 2018 through 31 October 2018
Note

QC 20190802

Available from: 2019-08-02 Created: 2019-08-02 Last updated: 2019-08-02Bibliographically approved
Neves, A. C., Leander, J., Karoumi, R. & Gonzalez, I. (2019). Cost-based optimization of the performance of a damage detection system. In: Caspeele, R Taerwe, L Frangopol, DM (Ed.), LIFE-CYCLE ANALYSIS AND ASSESSMENT IN CIVIL ENGINEERING: TOWARDS AN INTEGRATED VISION. Paper presented at 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018; Ghent; Belgium; 28 October 2018 through 31 October 2018 (pp. 2103-2111). CRC PRESS-TAYLOR & FRANCIS GROUP
Open this publication in new window or tab >>Cost-based optimization of the performance of a damage detection system
2019 (English)In: LIFE-CYCLE ANALYSIS AND ASSESSMENT IN CIVIL ENGINEERING: TOWARDS AN INTEGRATED VISION / [ed] Caspeele, R Taerwe, L Frangopol, DM, CRC PRESS-TAYLOR & FRANCIS GROUP , 2019, p. 2103-2111Conference paper, Published paper (Refereed)
Abstract [en]

Situations such as the collapse of civil engineering structures can be avoided if Structural Health Monitoring (SHM) systems can detect early potential failures and timely withdraw the structure from service ahead of a likely disaster. Structural safety is the leading reason for the implementation of SHM but also noteworthy is the cost reduction associated with routine maintenance and inspection. One of the remaining obstacles to fully implement SHM systems in our infrastructure deals with justifying their economic advantage. This paper proposes a rational framework for the use of SHM in the decision making process regarding the maintenance of civil engineering structures, based on the optimal setup of the damage detection system that yields the minimum associated deployment cost. Concepts such as Bayesian Theorem, Damage Index and Receiver Operating Characteristic curve are used in the proposed framework.

Place, publisher, year, edition, pages
CRC PRESS-TAYLOR & FRANCIS GROUP, 2019
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-255229 (URN)000471120402048 ()2-s2.0-85063957299 (Scopus ID)
Conference
6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018; Ghent; Belgium; 28 October 2018 through 31 October 2018
Note

QC 20190903

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-09-03Bibliographically approved
Zangeneh, A., Battini, J.-M., Pacoste, C. & Karoumi, R. (2019). Fundamental Modal Properties of Simply Supported Railway Bridges Considering Soil-Structure Interaction Effects. Soil Dynamics and Earthquake Engineering, 121, 212-218
Open this publication in new window or tab >>Fundamental Modal Properties of Simply Supported Railway Bridges Considering Soil-Structure Interaction Effects
2019 (English)In: Soil Dynamics and Earthquake Engineering, ISSN 0267-7261, E-ISSN 1879-341X, Vol. 121, p. 212-218Article in journal (Refereed) Published
Abstract [en]

In this paper, a simplified discrete model for calculating the modal parameters of the fundamental vertical mode of a simple beam on viscoelastic supports is proposed. Exact closed-form expressions for the fundamental natural frequency and modal damping ratio of the aforementioned coupled system are derived, as a function of the beam geometry and the foundation impedances. Using this model, the effect of the dynamic stiffness and dissipation capacity of the foundation-soil system on the modal characteristics of the fundamental vertical mode of the railway beam bridges is investigated and discussed. The proposed closed-form expressions, in combination with the impedance functions of different foundation-soil systems, can clarify the main features of dynamic SSI analysis of the railway beam bridges and lead to review the recommended modal damping ratios in the code provisions and design manuals.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Resonance of railway bridges, Dynamic Soil-Structure Interaction, Discrete Model, Impedance Functions, Period Lengthening, Foundation Damping
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-250254 (URN)10.1016/j.soildyn.2019.03.022 (DOI)000469897300016 ()2-s2.0-85063321442 (Scopus ID)
Note

QC 20190610

Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-06-25Bibliographically approved
Leander, J. & Karoumi, R. (2019). The value of monitoring the service life prediction of a critical steel bridge. In: Caspeele, R Taerwe, L Frangopol, DM (Ed.), LIFE-CYCLE ANALYSIS AND ASSESSMENT IN CIVIL ENGINEERING: TOWARDS AN INTEGRATED VISION. Paper presented at 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018; Ghent; Belgium; 28 October 2018 through 31 October 2018 (pp. 2121-2128). CRC PRESS-TAYLOR & FRANCIS GROUP
Open this publication in new window or tab >>The value of monitoring the service life prediction of a critical steel bridge
2019 (English)In: LIFE-CYCLE ANALYSIS AND ASSESSMENT IN CIVIL ENGINEERING: TOWARDS AN INTEGRATED VISION / [ed] Caspeele, R Taerwe, L Frangopol, DM, CRC PRESS-TAYLOR & FRANCIS GROUP , 2019, p. 2121-2128Conference paper, Published paper (Refereed)
Abstract [en]

This paper is focused on the service life prediction of steel bridges subjected to a combination of corrosion and fatigue. Both deterioration mechanisms are dubious to handle in theoretical assessments due to large uncertainties, on the action effect side and the resistance side. A reliability-based assessment in combination with updating considering monitoring and inspections provide an approach to reduce the uncertainties. To evaluate what assessment actions to engage, this approach has been combined with Bayesian decision theory which provides a rational basis to evaluate the value of information (VoI). The Old Lidingo Bridge in Sweden is used as a case study to demonstrate the reliability-based approach. This bridge is subjected to severe corrosion and has been deemed unfit for service. However, it provides the only link to the island Lidingo for the local tram and pedestrians why the bridge owner has decided to keep it in service until a new bridge is in place. To secure the safety of the bridge, recurrent inspections are conducted and discovered defects are repaired immediately. A system for continuous monitoring of critical parts was installed during the spring 2017. The bridge, the approach for assessment, and the procedure for evaluating the VoI are presented in the paper.

Place, publisher, year, edition, pages
CRC PRESS-TAYLOR & FRANCIS GROUP, 2019
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-255228 (URN)000471120402050 ()2-s2.0-85063941376 (Scopus ID)
Conference
6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018; Ghent; Belgium; 28 October 2018 through 31 October 2018
Note

QC 20190903

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-09-03Bibliographically approved
Arvidsson, T., Andersson, A. & Karoumi, R. (2019). Train running safety on non-ballasted bridges. International Journal of Rail transportation, 7(1), 1-22
Open this publication in new window or tab >>Train running safety on non-ballasted bridges
2019 (English)In: International Journal of Rail transportation, ISSN 2324-8378, E-ISSN 2324-8386, Vol. 7, no 1, p. 1-22Article in journal (Refereed) Published
Abstract [en]

The train running safety on non-ballasted bridges is studied based on safety indices from the vertical wheel-rail forces. A 2D train- track-bridge interaction model that allows for wheel-rail contact loss is adopted for a comprehensive parametric study on high-speed passenger trains. The relation between bridge response and vehicle response is studied for more than 200 theoretical bridges in 1-3 spans. The bridge's influence on running safety and passenger comfort is differentiated from the influence of the track irregularities. The Eurocode bridge deck acceleration limit for non-ballasted bridges is 5 m/s(2) based on the assumed derailment risk at 1 g from wheel-rail contact loss. This study shows that the running safety indices are not compromised for bridge accelerations up to 30 m/s(2). Thus, accelerations at 1 g do not in itself lead to contact loss and there is potential to enhance the Eurocode safety limits for non-ballasted bridges.

Place, publisher, year, edition, pages
Taylor & Francis, 2019
Keywords
Railway bridge, slab track, deck acceleration, train-track-bridge interaction, wheel-rail force, running safety
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-254133 (URN)10.1080/23248378.2018.1503975 (DOI)000469852200001 ()2-s2.0-85052582924 (Scopus ID)
Note

QC 20190620

Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-06-20Bibliographically approved
Neves, A. C., Gonzalez, I., Leander, J. & Karoumi, R. (2018). A New Approach to Damage Detection in Bridges Using Machine Learning. In: Conte, JP Astroza, R Benzoni, G Feltrin, G Loh, KJ Moaveni, B (Ed.), EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL STRUCTURES: TESTING, SENSING, MONITORING, AND CONTROL. Paper presented at International Conference on Experimental Vibration Analysis for Civil Engineering Structures (EVACES), JUL 12-14, 2017, Univ California San Diego, San Diego, CA (pp. 73-84). SPRINGER INTERNATIONAL PUBLISHING AG
Open this publication in new window or tab >>A New Approach to Damage Detection in Bridges Using Machine Learning
2018 (English)In: EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL STRUCTURES: TESTING, SENSING, MONITORING, AND CONTROL / [ed] Conte, JP Astroza, R Benzoni, G Feltrin, G Loh, KJ Moaveni, B, SPRINGER INTERNATIONAL PUBLISHING AG , 2018, p. 73-84Conference paper, Published paper (Refereed)
Abstract [en]

At the same time that civil engineering structures are increasing in number, size and longevity, there is a conforming increasing preoccupation regarding the monitoring and maintenance of such structures. In this sense the demand for new reliable Structural Health Monitoring systems and damage detection techniques is high. A model-free damage detection approach based on Machine Learning is presented in this paper. The method performs on the collected feature measurements on a railway bridge, which for this study were gathered in a numerical experiment using a three dimensional finite element model. The first step of the approach consists in collecting the dynamic response of the structure, simulated during the passage of a train over the bridge, in both the healthy and damage states of the structure. The next step consists in the design and unsupervised training of Artificial Neural Networks that use as input accelerations and axle loads and compute a novelty index, called prediction error, based on a novelty detection approach. The distribution of the obtained prediction errors is statistically evaluated by means of a Gaussian Process and, after this process, damage indexes can be defined. Finally, the efficiency of the method is assessed in terms of Type I (false positive) and Type II (false negative) errors using Receiver Operating Characteristic curves. The promising results obtained in the case study demonstrate the capability of the presented method.

Place, publisher, year, edition, pages
SPRINGER INTERNATIONAL PUBLISHING AG, 2018
Series
Lecture Notes in Civil Engineering, ISSN 2366-2557 ; 5
Keywords
Structural Health monitoring, Machine Learning, Damage detection, Model-free based method, Artificial Neural Networks
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-242272 (URN)10.1007/978-3-319-67443-8_5 (DOI)000455235800005 ()2-s2.0-85060236672 (Scopus ID)978-3-319-67443-8 (ISBN)978-3-319-67442-1 (ISBN)
Conference
International Conference on Experimental Vibration Analysis for Civil Engineering Structures (EVACES), JUL 12-14, 2017, Univ California San Diego, San Diego, CA
Note

QC 20190201

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-08-20Bibliographically approved
Andersson, A., Lind Östlund, J., Mahir, Ü.-K., Battini, J.-M. & Karoumi, R. (2018). Full-Scale Dynamic Testing of a Railway Bridge Using a Hydraulic Exciter. In: Conte, JP Astroza, R Benzoni, G Feltrin, G Loh, KJ Moaveni, B (Ed.), EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL STRUCTURES: TESTING, SENSING, MONITORING, AND CONTROL. Paper presented at International Conference on Experimental Vibration Analysis for Civil Engineering Structures (EVACES), JUL 12-14, 2017, Univ California San Diego, San Diego, CA (pp. 354-363). SPRINGER INTERNATIONAL PUBLISHING AG
Open this publication in new window or tab >>Full-Scale Dynamic Testing of a Railway Bridge Using a Hydraulic Exciter
Show others...
2018 (English)In: EXPERIMENTAL VIBRATION ANALYSIS FOR CIVIL STRUCTURES: TESTING, SENSING, MONITORING, AND CONTROL / [ed] Conte, JP Astroza, R Benzoni, G Feltrin, G Loh, KJ Moaveni, B, SPRINGER INTERNATIONAL PUBLISHING AG , 2018, p. 354-363Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a full-scale dynamic testing on a simply supported railway bridge with integrated end-shields, by using a hydraulic exciter. Experimental frequency response functions are determined based on load controlled frequency sweeps. Apart from accurate estimates of natural frequencies, damping and mode shapes, the experimental testing also gives valuable information about the dynamic characteristics at resonance and amplitude dependent nonlinearities. Numerical models are used to simulate the dynamic response from passing trains which is compared to experimental testing of similar train passages. The results show that the bridge deck is partially constrained due to the interaction between the end-shields and the wing walls with the surrounding soil. Measurements at the supports also show that the flexibility of the foundation needs to be accounted for. An updated numerical model is able to accurately predict the response from passing trains. The response is lower than that predicted from the initial simulations and the bridge will fulfil the design requirements regarding vertical deck acceleration.

Place, publisher, year, edition, pages
SPRINGER INTERNATIONAL PUBLISHING AG, 2018
Series
Lecture Notes in Civil Engineering, ISSN 2366-2557 ; 5
Keywords
Railway bridge, Dynamics, Full-scale test, Hydraulic exciter, Frequency response function
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-242273 (URN)10.1007/978-3-319-67443-8_30 (DOI)000455235800030 ()2-s2.0-85060189447 (Scopus ID)978-3-319-67443-8 (ISBN)978-3-319-67442-1 (ISBN)
Conference
International Conference on Experimental Vibration Analysis for Civil Engineering Structures (EVACES), JUL 12-14, 2017, Univ California San Diego, San Diego, CA
Note

QC 20190201

Available from: 2019-02-01 Created: 2019-02-01 Last updated: 2019-02-01Bibliographically approved
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
Show others...
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
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-5447-2068

Search in DiVA

Show all publications