Studies on Dynamic Response of Subway Tunnels with Initial Defect under Long-term Train Loads
(0) Based on the background of a subway construction project, deterioration characteristics of the existed subway tunnels under long-term train loads is studied by using the method of stiffness discount which could reflect fatigue damage of the structure.Firstly, dynamic response of the tunnel with initial defects caused by approaching construction under long-term train loads is analyzed according numerical simulation, and some results under different degrees of fatigue are obtained.Then, numerical results of acceleration responses at such different points as the upper vault, the side wall and the bottom of tunnels in two directions, are compared with each other while the train loads are applied at the left tunnel, especially under three different stiffness.Our investigation shows local structural damage in the position with initial cracks will be caused by a high cycle stress although there are fewer influences of stiffness changes on dynamic response of tunnels.
Fatigue cracks Stiffness discount Train load Subway tunnel Dynamic response
Fei Dong Jun Dong Wei Ze Sun
School of Civil Engineering and Traffic Engineering,Beijing University of Civil Engineering and Arch School of Civil Engineering and Traffic Engineering,Beijing University of Civil Engineering and Arch
国际会议
上海
英文
1005-1009
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）