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Dynamic Soil-Structure Interaction Analysis of Railway Bridges: Numerical and Experimental Results
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. ELU Konsult AB.
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The work reported in this thesis presents a general overview of the dynamic response of short-span railway bridges considering soil-structure interaction. The study aims to identify the effect of the surrounding and underlying soil on the global stiffness and damping of the structural system. This may lead to better assumptions and more efficient numerical models for design.A simple discrete model for calculating the dynamic characteristics of the fundamental bending mode of single span beam bridges on viscoelastic supports was proposed. This model was used to study the effect of the dynamic stiffness of the foundation on the modal parameters (e.g. natural frequency and damping ratio) of railway beam bridges. It was shown that the variation in the underlying soil profiles leads to a different dynamic response of the system. This effect depends on the ratio between the flexural stiffness of the bridge and the dynamic stiffness of the foundation-soil system but also on the ratio between the resonant frequency of the soil layer and the fundamental frequency of the bridge.

The effect of the surrounding soil conditions on the vertical dynamic response of portal frame bridges was also investigated both numerically and experimentally. To this end, different numerical models (i.e. full FE models and coupled FE-BE models) have been developed. Controlled vibration tests have been performed on two full-scale portal frame bridges to determine the modal properties of the bridge-soil system and calibrate the numerical models. Both experimental and numerical results identified the substantial contribution of the surrounding soil on the global damping of short-span portal frame bridges. A simplified model for the surrounding soil was also proposed in order to define a less complicated model appropriate for practical design purposes.

Place, publisher, year, edition, pages
KTH: Universitetsservice US-AB , 2018.
Series
TRITA-ABE-DLT ; 182
Keywords [en]
Railway Bridge; Soil-Structure Interaction; Full FE modeling; Simplified modeling; Coupled FE-BE modeling; Field measurements; Model updating
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-224313ISBN: 978-91-7729-713-0 (print)OAI: oai:DiVA.org:kth-224313DiVA, id: diva2:1190784
Presentation
2018-04-13, M108, KTH, Brinellvägen 23, Stockholm, 09:30 (English)
Opponent
Supervisors
Funder
Swedish Research Council Formas
Note

QC 20180315

Available from: 2018-03-15 Created: 2018-03-15 Last updated: 2018-03-15Bibliographically approved
List of papers
1. Dynamic Stiffness Identification of Portal Frame Bridge-Soil System using Controlled Dynamic Testing
Open this publication in new window or tab >>Dynamic Stiffness Identification of Portal Frame Bridge-Soil System using Controlled Dynamic Testing
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2017 (English)In: X International Conference on Structural Dynamics, EURODYN 2017, Elsevier, 2017, Vol. 199, p. 1062-1067Conference paper, Published paper (Refereed)
Abstract [en]

Short-span portal frame bridges are predominant in Swedish railway lines. Although it is well known that the dynamic response of these partially-buried rigid structures is governed by the surrounding soil, the effect of the soil is usually neglected in the train-induced vibration analysis due to the expensive computational costs. This paper focuses on studying the effect of the surrounding soil conditions on the dynamic response of portal frame railway bridges. The study aims to validate the accuracy of simplified numerical models in evaluating the dynamic stiffness and modal properties of the bridge-soil system. To achieve this aim, a model updating method was used for FE model calibration of a full-scale portal frame bridge using measured frequency response functions. 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 these structures.

Place, publisher, year, edition, pages
Elsevier, 2017
Series
Procedia Engineering, ISSN 1877-7058 ; 199
Keywords
Dynamic Stiffness identification, Frequency response functions, Full-scale test, Portal frame bridge, Soil-Structure interaction
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:kth:diva-215897 (URN)10.1016/j.proeng.2017.09.293 (DOI)000422868901036 ()2-s2.0-85029901442 (Scopus ID)
Conference
10th International Conference on Structural Dynamics, EURODYN 2017, Faculty of Civil and Industrial Engineering, Rome, Italy, 10 September 2017 through 13 September 2017
Funder
Swedish Research CouncilSwedish Transport Administration
Note

QC 20171018

Available from: 2017-10-18 Created: 2017-10-18 Last updated: 2018-03-15Bibliographically approved
2. Identification of soil-structure interaction effect in a portal frame railway bridge through full-scale dynamic testing
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

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Zangeneh Kamali, Abbas

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