双链式悬索桥车桥耦合振动研究  

Study of Vehicle-bridge Coupling Vibration of Double Cable Suspension Bridge

作　　者：丁南宏[1,2] 林丽霞[1] 钱永久[2] 廖伟华[1] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《兰州交通大学学报》2010年第1期95-99,共5页Journal of Lanzhou Jiaotong University

基　　金：甘肃省自然科学基金(2008GS02604);兰州交通大学"青蓝"人才工程基金(QL-05-13A)

摘　　要：采用单个移动质量-弹簧-阻尼模型模拟车辆,应用达朗贝尔原理和位移协调条件,推导出车桥耦合振动的运动方程.考虑几何非线性及桥面不平度因素,就车辆沿桥纵轴向中心行驶和偏心行驶2种工况,探讨单个移动车辆荷载对双链悬索桥振动响应的影响.针对桥面设计理论竖曲线、水平竖曲线、运营20多年后实测竖曲线,综合考虑桥面不平度,探讨在单个移动车辆荷载下双链悬索桥的车振响应特征.这对该类桥动力性能评估及动力加固设计都有积极的意义.A single moving mass-spring-damper model is adopted to simulate the vehicle model. The equation of vehicle-bridge coupling vibration is derived, using D＇Alembert principle and the conditions of displacement compatibility. The dynamic responses of a double cable suspension bridge to the vehicle moving at dif- ferent speeds are analyzed, taking into account geometric nonlinearity and irregular profile of the bridge pavement under two types of vehicle loading conditions, namely moving along the center and the eccentric longitudinal axis. The character of vehicle vibration of double cable suspension bridge under a single moving vehicle load is discussed, contrary to designing vertical curve, level of vertical curve, and measured verti- cal curve after 20 years service, synthetically considering the bridge deck roughness. The study of the dynamic responses character of double cable suspension bridge has a positive significance on dynamic performance evaluation and reinforcement design of such type bridge.

关 键 词：桥梁工程 车桥耦合振动 几何非线性 双链式悬索桥 路面不平度 车辆模型 

分 类 号：U441[建筑科学—桥梁与隧道工程]