考虑轴向力作用下车-桥耦合系统的动力学建模与分析  

Dynamic Model and Analysis of Vehicle-Bridge Coupled System with an Axial Force of Bridge

作　　者：朱怀亮[1,2] 谢严[2] 胡开封[2] 袁二娜[2] 

机构地区：[1]上海大学力学系,上海200444 [2]上海市应用数学和力学研究所,上海200072

出　　处：《南昌大学学报（工科版）》2008年第4期389-393,408,共6页Journal of Nanchang University(Engineering & Technology)

基　　金：上海市重点学科建设项目(Y0103)

摘　　要：应用达朗贝尔原理和振型分解法,建立了在桥梁轴向力作用下车-桥系统的动力学方程,利用Newmark-β方法,对车桥耦合问题进行数值求解,比较分析了桥梁轴向力、车速等对系统动力学响应的影响。研究表明:桥梁的轴向预拉力可有效地抑制桥梁的横向振动、减小车辆动力响应幅值以及车桥间耦合反力的数值,提高车辆行驶的平顺性。随着车辆速度的提高,桥梁动力响应的幅值加大,但车-桥系统的耦合作用相对减弱。The dynamic equations were derived for the vehicle-bridge coupled system with an axial force of bridge based on D＇ Alembert＇ s principle and the assumed mode method. The numerical results were obtained by Newmark-β method. Dynamic responses of the system caused by axial forces of bridge and speed of vehicle were discussed respectively. It shows that a suitable axial pre-foree of bridge should be exerted to the system for suppressing the vibration of bridge, reducing the amplitude of traverse vibration of vehicle and the magnitude of coupled reactions between vehicle and bridge. The dynamic responses of bridge increased with the increase of speed of vehicle, but the couoled interaction behavior of vehicle and bridge was relatively weakened.

关 键 词：轴向力 耦合振动 动力学响应 

分 类 号：O322[理学—一般力学与力学基础] O39[理学—力学]