【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。更多还原

【Abstract】 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.更多还原