摘要
针对天兴洲长江大桥正桥的斜拉桥初步设计方案,建立空间有限元模型,采用动态时程分析方法,进行地震—车—桥耦合振动分析。根据多遇地震条件下结构可正常使用且不产生过大变形的要求,确定地震荷载的选择。选取货物列车(重车编组和空车编组2种方式)以80 km.h-1、中速旅客列车以200 km.h-1、高速旅客列车以250 km.h-1速度4种过桥方案,分别进行地震—车—桥耦合振动分析。计算结果表明,桥梁结构满足UIC规范中铁路桥梁设计对振动加速度的要求;车辆的最大脱轨系数均小于0.8;除高速旅客列车过桥方案的最大轮重减载率达到0.631(不满足0.60的安全标准但满足0.65的容许标准)以外,其余列车过桥方案的轮重减载率均小于0.60,满足安全标准;4种方案列车通过桥梁时的舒适(平稳)性与安全性均满足规范要求,但在相同的线路状态和车速下,货物列车空车编组时比重车编组时差。
The space finite element model is established based on the preliminary design scheme of the main cable-stayed bridge of Tianxingzhou Yangtze River Bridge. The coupling vibration analysis of earthquakevehicle-bridge is carried out by using dynamic time-history analytic method. The seismic load is selected according to the code of design, which permits only quite light destroy occurrence on the structure, at the same time the structure can be normally used under common earthquake. Dynamic response of the earthquake-vehicle-bridge coupling system was analyzed respectively for four cases. The first case is the loaded freight cars at the speed of 80km·h^-1. The second case is empty freight cars at the speed of 80km·h^-1. The third case is quasi-high speed passenger cars at the speed of 200km·h^-1 and the fourth case is highspeed passenger cars at the speed of 250km·h^-1. Results show that, the vibration accelerations of bridge meet the requirements according to the UIC Design Code. The maximum derailment coefficient is less than 0.8 under each case. The maximum rate of wheel load reduction at the high-speed passenger cars passing bridge ease is 0. 631, which exceeds the safety limit value 0.6 but is less than the allowable limited value 0.65. For the rest three cases, the maximum rate of wheel load reduction is less than the safety limit value 0.60 thus meets the safety standards. The trains can pass the bridge safely and comfortably （smoothly） at all cases. But under the same conditions of track and speed, the loaded freight train is safer than empty freight train.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2006年第5期54-59,共6页
China Railway Science
基金
铁道部科技研究开发计划项目(2004G028-B-1)
关键词
斜拉桥
地震
车-桥耦合振动
走行安全性
乘坐舒适性
Cable-stayed bridge
Earthquake
Vehicle-bridge coupling vibration
Running safety
Riding comfortableness
