A case study of damping mechanisms in concrete railway bridges
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Measurements on different railway bridges have shown the problem to properly evaluate damping as the numerous influencing parameters play an important role in this uncertainty.
The main aim of this thesis is to come up with a model for the energy dissipation during cyclic loadings and link it to the evaluation of the overall damping in a railway bridge. In this study, the commercial software Abaqus/Explicit has been used along with appropriate material models such as the Concrete Damaged Plasticity and the Concrete Smeared Cracking model. It has been judged important to consider both the plastic behaviour and the stiffness degradation that occurs.
The results of this thesis project show that the implemented finite element model in Abaqus/Explicit successfully simulates the energy dissipation as well as the stiffness degradation in the concrete for both the tension and compression tests. It is also possible to link this local energy loss to a global one that is materialized by an overall damping in the railway bridge.
Further research should take care of the stiffness degradation in concrete submitted to cyclic loadings and modelled according to the Concrete Damaged Plasticity model. It should also investigate the possibility to improve the results given by the model in compression.
Place, publisher, year, edition, pages
Trita-BKN-Examensarbete, ISSN 1103-4297 ; 390
Cyclic loading, Reinforced Concrete, Railway bridge, Damping, Finite Element Analysis, Vibrations
IdentifiersURN: urn:nbn:se:kth:diva-125352OAI: oai:DiVA.org:kth-125352DiVA: diva2:639706
Pacoste, CostinJohansson, Christoffer