大跨度铁路斜拉桥车桥耦合振动非线性分析  

Nonlinear Analysis of Vehicle-bridge Coupled Vibration of Railway Cable-Stayed Bridges with Long Span

作　　者：王贵春[1] 潘家英[2] 张欣[1] 

机构地区：[1]郑州大学,郑州450001 [2]铁道科学研究院,北京100081

出　　处：《应用力学学报》2008年第3期524-528,549,共5页Chinese Journal of Applied Mechanics

摘　　要：大跨度铁路斜拉桥在车辆通过时,可能发生较大的变形,致使结构几何非线性效应变得显著。针对大跨度斜拉桥的几何非线性特征及铁路桥的特点,建立了结构空间动力分析模型。以广西红水河铁路斜拉桥和主跨300米双线铁路斜拉桥方案为例,模拟机车过桥的全过程,计算了斜拉桥的车桥耦合振动响应,分析了各种因素对桥梁动力响应的影响。结果表明,对于大跨度铁路斜拉桥,非线性分析结果与线性分析结果相比,具有明显差别。在大跨度铁路斜拉桥车桥耦合振动分析中,考虑结构几何非线性效应是必要的。Railway cable-stayed bridge with long span may produce large deformation when vehicle passes through the bridge, so the geometrically nonlinear characteristic becomes significant. Structural geometrical nonlinearity and the characteristics of the railway bridge, a model of 3-dimensional dynamic analysis of cable-stayed bridge is developed. The Hongshui River railway cable-stayed bridge in Guangxi and a double-track railway cable-stayed bridge plan with 300m main span are taken as examples to calculate the bridge responses of vehicle-bridge coupled vibration. The whole history of a locomotive passing on the bridges is simulated and the effects of various factors on the dynamic responses are analyzed. The results indicate that for railway cable-stayed bridge with long span, the difference between the results of nonlinear analysis and those of linear analysis is obvious. It is necessary to consider the structural geometrical nonlinearity in analysis of vehicle-bridge coupled vibration of railway cable-stayed bridges with long span.

关 键 词：斜拉桥 几何非线性 有限位移理论 车桥耦合振动 动力分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]