城市高架桥车-桥-墩系统竖向振动分析  

Dynamic Analysis of Coupled Vehicle-Bridge-Pier Systems

作　　者：叶茂[1] 谭平[2] 宁响亮[1] 周福霖[2] 任岷[2] 

机构地区：[1]哈尔滨工业大学深圳研究生院,深圳518055 [2]广州大学抗震中心,广州510405

出　　处：《应用力学学报》2009年第3期495-500,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(50578046)

摘　　要：假设城市高架桥为两端简支的欧拉-伯努利梁模型以及桥墩为底部固结的柱,考虑两自由度车辆移动系统与桥面结构表面接触处不平整产生的随机激励以,建立了多个移动车辆系统-桥-墩的耦合力学模型,并且给出了耦合振动方程详细的求解步骤。数值分析采用Wilson-θ法求解。通过仿真分析,讨论了在不同路面等级、不同车辆移动速度下桥梁跨中位移响应和桥墩轴力的变化规律。最后根据车-桥-墩耦合力学模型和车-桥耦合力学模型,比较了两种分析模型对桥墩底部轴力和桥梁跨中截面位移的影响。分析结果表明桥墩对桥梁跨中截面位移的影响可以忽略不计,但是对桥墩本身所受轴力的影响则非常显著。The coupling dynamic behavior of vehicle-bridge-pier is investigated. The bridge is modeled as a continuous Euler-Bernoulli beam simply supported at the both ends, the pier as column fixed at the bottom and the vehicle a two-DOF system with linear suspensions and tire flexibility. The influence of surface irregularity of bridges and the vertical stiffness of pier are considered. The coupled governing equation of vehicles-bridge-pier system is derived, which is solved with Wilson-θ method in the time domain. The effect of road surface roughness and vehicle speed on deflection of beam and axial forces of the pier are discussed. The numerical results show the difference between the vehicle-bridge-pie system and the vehicle-bridge system.

关 键 词：高架桥 车-桥-墩系统 耦合振动 响应 桥墩轴力 

分 类 号：TU311.3[建筑科学—结构工程] U441.2[建筑科学—桥梁与隧道工程]