摘要
为了探究地震对高速列车和桥梁的影响,建立车辆-桥梁空间耦合系统模型。将规格化的地震波作为激励,同时考虑轨道随机不平顺的影响。采用新型显式积分法求解系统方程。分析不同烈度地震作用下车桥耦合系统的动力响应。数值结果表明,地震烈度在桥梁的抗震设防烈度范围内时,桥梁的振动加速度和挠度响应均符合规范的限值要求。车辆运行平稳性的Sperling指标相对加速度指标较为宽松,当地震烈度为7度及以上时,车辆已不能平稳地运行于桥梁之上。在相对较弱的地震作用下,轨道随机不平顺对桥梁的垂向加速度响应影响明显,不应忽略。
In order to explore the impact of earthquakes on trains and bridges, the model of vehicle-bridge coupledsystem was established in this study. The normalized seismic wave was a kind of stimulation, meanwhile, the influ-ence of track random irregularity was taken into account. The system equation was solved by new explicit integra-tion method. The dynamic responses of the coupled system of train-bridge under earthquakes of different intensitywere analyzed. Numerical results show that both the acceleration and the deflection response of the bridge meetthe requirements of norms when earthquakes intensity is within the scope of the bridge＇s seismic fortification in-tensity. The Sperling index of vehicle stability is relatively looser than acceleration index, and the vehicle can＇trun steady on the bridge when seismic intensity is seven degrees or above. The track random irregularity has obvi-ous effects on vertical acceleration of the bridge under a relatively weak earthquake, which shouldn＇t be ignored.
出处
《华东交通大学学报》
2015年第4期11-17,32,共8页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(11172192)
关键词
车辆-桥梁耦合系统
轨道随机不平顺
地震波规格化
动力响应
vehicle-bridge coupled system
track random irregularity
normalized seismic waves
dynamic response
