车-桥耦合振动分析的模态综合方法

Dynamic Analysis on Coupled Vehicle-bridge System by Modal Synthesis Method

对车辆与桥梁之间产生的耦合振动进行了全过程分析。首先通过有限元软件对桥梁进行模态分析,在此基础上建立三维车辆模型与桥梁模型组成互动体系的振动时变方程组,然后通过数值逐步积分进行求解。分析方法考虑了桥面平整度、车速等因素。该法不受桥型、跨径等因素的制约,可以模拟多车道和多辆车,有更强的通用性,优化精简了桥梁结构的自由度,提高了计算速度,计算结果准确可靠。

The whole course of coupling vihration when vehicles run across bridge is analyzed in detail. Bridge modal is analyzed firstly by existing general finite elements software; then the vibration equation of interactive system constituted by spatial vehicle model and bridge medel established; finally the equation is solved by integral method. The analysis considers such factors as bridge deck smoothness, vehicle velocity, etc. The method isn＇t restricted by different bridge types and span, and multi-lane and multi-vehicle can be simulated. The method has wider universality, decreases the degree of freedom of bridge structures, improves the computing speed, the result is accurate and reliable.