匀加速行驶车辆与桥梁耦合振动的分析方法  

Analysis method of coupling vibration of bridge and moving vehicle with uniform acceleration

作　　者：陈榕峰[1,2] 宋一凡[1] 贺拴海[1] 张建莉[3] 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [2]广东省交通运输规划研究中心,广东广州510101 [3]华南农业大学工程学院,广东广州510642

出　　处：《长安大学学报（自然科学版）》2011年第3期51-54,67,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：交通部交通应用基础研究项目(200431981210)

摘　　要：为了分析匀加速行驶车辆与桥梁的相互耦合作用,在重点考虑了移动车辆的牵连惯性力及其行车加速度对桥梁竖向振动作用的条件下,建立了匀加速移动的四自由度车辆模型与桥梁耦合振动微分方程;利用有限元的求解方法,在匀加速移动车辆的初速度和加速度2个运动参数变化情况下,得出了桥梁的动挠度响应规律。数值分析表明:车辆初速度和行车加速度对桥梁动力系数影响较大;随初速度的增大,桥梁动力系数增大;随加速度的增大,桥梁动力系数先增大、后减小,存在一个最值区域。A differential equation of coupling vibration between a four degree moving vehicle mod- el with uniform acceleration and bridge was advanced by mainly considering both influences of interia of force of moving vehicle and its acceleration on vertical vibration. The principle variation of bridge deflection was calculated with two variable parameters： the intial speed and the acceleration of moving vehicle by using the method of finite element. The results show that the the intial speed and the acceleration of moving vehicle have great influence on the dynamic amplification factor of bridge, the bridge dynamic amplification factor increases with the increasing of vehicle initial speed, but increases initially, then decreases with the increasing of vehicle acceleration, and there is an extremum region. 8 figs, 12 refs.

关 键 词：桥梁工程 桥梁振动响应 有限元法 加速度 动力系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]