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Dynamic response of a composite railway bridge to passing trains: Comparison of FEM simulations and measurements
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis focuses on the modeling of a composite railway bridge both in 2D and 3D with the commercial finite element program ABAQUS. Predicted accelerations and strains due to passing trains from simulation are compared with in-situ measurements. It is found that the simple 2D model is insufficient to reflect the behavior of the bridge as it predicts lower accelerations than the measured results while the calibrated 3D model can well simulate the behavior of the bridge. A dynamic amplification factor (DAF) of displacement is obtained as 1.09 from the modeling and at resonance speed the DAF increases to 1.36 while the DAF calculated according to the simple formula of the Eurocode is 1.2. The resonance speed observed from the simulation matches well with the resonance speed calculated according to ERRI which indicates that the resonance speed can be predicted using the formula of ERRI and verified with the 3D model. It is concluded that the track continuity should be considered for the modeling of the bridge; the ballast has influence on the global bending stiffness of the bridge; and the supports in the real case may have some restriction instead of simply supported boundary condition.

Place, publisher, year, edition, pages
Trita-BKN-Examensarbete, ISSN 1103-4297 ; 361
Keyword [en]
Railway bridge; Dynamic analysis; Finite element analysis; ABAQUS; In-situ measurements; Monitoring; Ballasted track; Acceleration; Strain.
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-125338OAI: diva2:639643
Available from: 2013-08-13 Created: 2013-08-08 Last updated: 2013-08-13Bibliographically approved

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