带弹性支撑多跨连续梁桥的车桥耦合演变随机振动  

Coupled vehicle-bridge evolutionary random vibration for a multi-span continuous bridge with elastic bearings

作　　者：叶茂[1] 张鹏[1] 傅继阳[1] 曹文斌[1] 任珉[1] 

机构地区：[1]广州大学广州市结构安全与健康监测重点实验室/广东高校结构安全与健康监测工程技术研究中心,广州510006

出　　处：《振动与冲击》2014年第3期76-82,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51208125;51178126);广州市科技计划项目(2013J2200074;11F102010004)

摘　　要：以中间带弹性支撑连续梁桥为研究对象,车辆简化为两自由度车辆移动系统,桥面不平度功率谱密度作为输入,建立了车-弹性支撑连续梁桥的耦合力学分析模型。采用转换矩阵法获取连续梁桥的模态函数,结合状态空间理论和演变随机过程一般理论,给出了整个耦合系统演变随机响应的分析方法,并结合数值算列,探讨了跨中支座条件、桥梁截面抗弯刚度、弹性支撑位置、车辆运行速度及桥面平整度对车桥耦合系统随机响应的影响。The random vibration of a coupled vehicle-bridge system under moving vehicular loads was studied.The bridge and vehicle were modeled as a continuous beam with elastic bearings,and a 2-DOF system with linear suspensions and tire flexibility,respectively.The power spectral density of the bridge surface irregularity was taken as an input.Modes of the continuous beam were obtained with the transfer matrix method.According to the state space theory and general theory of evolutionary random processes,the analysis method for the random response of the coupled system was derived.The effects of conditions of mid-support,bending stiffness of bridge cross-section,location of elastic bearings,vehicle velocity, and bridge surface roughness on the random response of the coupled vehicle-bridge system were discussed.

关 键 词：动力响应弹性支撑 多跨连续梁 演变随机响应 车桥系统 耦合振动 

分 类 号：TU318[建筑科学—结构工程]