Seismic response analysis of train-track-bridge interaction system to evaluate running safety of train in case of high-speed railways
Biswajit PAL Post Graduate student Indian Institute of Technology, Guwahati Guwahati, Assam, India. biswajitjgec.1992@gmail.com
Anjan DUTTA Professor Indian Institute of Technology, Guwahati Guwahati, Assam, India. adutta@iitg.ernet.in
Anjan Dutta, born 1962, received his civil engineering degree from the Gauhati University. His main area of research is related to Bridge Engineering.
Biswajit Pal, born 1992, received his civil engineering degree from the West Bengal University of Technology.
Summary This study is intended to evaluate the seismic response of a train-track-bridge interaction system along with assessing the running safety of train. In regards to this, a rather simplified approach of introducing a complex, realistic bridge model into the coupled system is suggested and the system responses are found out with the co-simulation of MATLAB and ANSYS. Thereafter, in order to investigate the dynamic behaviour of the system, first a single span simply supported bridge of composite section made of concrete deck over steel box girder is taken and the effect of seismic excitation, train speed, bridge vibration and striking time of earthquake on the system responses are shown. Moreover, the running safety of train is also investigated with the help of a safety index, called derailment factor. Finally, a 3-span simply supported and a 3-span continuous bridge model are taken in order to show the effect of different status of train motion simultaneous with 12  Volume 46
Number 2 June 2016
earthquake on train-bridge responses in case of two different bridge model. In addition to that, the effect of those two bridge models on the safety index of running train are also shown. Some useful conclusions are drawn thereafter, indicating the importance of considering the dynamics of bridge-train interaction system in seismic design. Keywords: train-bridge interaction; seismic analysis; bridge model, co-simulation of MATLAB-ANSYS, running safety, dynamic response.
1.
Introduction
The dynamic effects of moving trains play key role in design of railway bridge. In case of high-speed railways, it would become inevitable to develop a coupled train-bridge model for effective realisation of the dynamic interaction of train and bridge. Further, the design of high-speed railway requires more strict design conditions than a conventional The Bridge and Structural Engineer