Dynamic analysis of a bridge structure exposed to high-speed railway traffic

Bucinskas, Paulius ; Agapii, Liuba ; Sneideris, Jonas

4. term

Structural and Civil Engineering, Master

2015

2015-06-04

159 pages

Dynamic behaviour of railway bridges became a topic of great importance due to development of high-speed railways in various countries. With increasing speeds the dynamic loads increase drastically and become harder to predict, thus more complex computational models are needed to proper evaluate the behaviour of the structure. Firstly, a simply supported beam subjected to a moving constant force is analysed, using analytical and finite element methods. Later a vehicle is implemented in the model in different ways: as a moving mass, single-degree-of-freedom system and multi-degree-of-freedom system. Next step is taken by introducing three-dimensional model, created using three-dimensional beam elements. The most advanced computational model, which includes the subsoil and a vehicle models, is described in the paper "Numerical modelling of dynamic response of high-speed railway bridges considering vehicle-structure and structure-soil-structure interaction". The tests performed to validate the computational models on a small-scale experimental model are presented in the paper "Experimental validation of a numerical model for three-dimensional railway bridge analysis by comparison with a small-scale model". The experimental tests show that a proper modelling of the vehicle-track system and implementation of subsoil are crucial for analysis of the structural dynamic behaviour. The proposed computational model, offers a simplified solution for preliminary calculations, but accounts for the most significant contributions to vibrations and deformations of the bridge-subsoil system.

dynamic analysis ; railway bridge ; high-speed ; vehicle ; small-scale model ; soil-structure interaction ; track unevenness

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