铁路斜拉桥的地震响应特性研究

Study on Seismic Response of Cable-Stayed Railway Bridge

通过对典型铁路斜拉桥在地震作用下的响应分析，研究了斜拉桥这种适用跨度大、空间受力性能优越的桥型的抗震性能。结果表明，影响斜拉桥在地震作用下的响应特性及桥上运行列车稳定性和安全性的因素主要是桥、车的动力特性及输入地震激励的物理特性。通过对不同结构参数、列车速度和地震作用条件下桥车响应的对比分析，得出了行车速度、桥梁横向刚度（宽跨比）、桥梁下部结构刚度以及不同输入地震激励对桥梁地震响应的影响规律与特点。

In this article,the earthquake response features of cable-stayed railway bridge are investigated through inputing different earthquake excitings to typical bridge and varying the vehicle and structural parameters.The study results show that the main factors affecting the seismic response characteristics of bridge are the dynamic properties of vehicles and bridge,as well as the input excitings.By the comparison analysis of various conditions,the effect mechanism of train velocity,lateral stiffness of bridge span,stiffness of sub-structure,and the input excitings is discussed and summarized.