车-桥耦合系统动力学建模与响应分析

Modeling and Response Analysis of Coupled Vehicle-Bridge System

车辆行驶过桥时,车与桥之间存在相互耦合作用。本文根据车的三种简化模型,分别建立了车与桥结构相互耦合作用的动力学模型,并给出桥结构在两轴车载荷作用下的动响应计算方法,该方法很容易推广到更一般的多轴车载荷作用的情况。文中通过数值算例计算了基于车的三种简化模型桥梁的响应,将三种计算结果与实验数据比较,证明二自由度的车简化模型为最优,此时桥梁的弯矩响应与实验结果能较好地吻合。

The modeling and analyzing methods are presented to describe their interaction and to solve the dynamic responses more exactly for coupled vehicle-bridge systems. Three types of simplified vehicle models are constructed to solve the response of bridge coupled with two-axes-vehicle, which can be extended easily to the cases of more-axes-vehicle, some numerical examples are calculated based on three simplified models of vehicle. The comparisons between the numerical results and the experimental ones conclude that the case of two-DOF-vehicle model approaches the best to coincide with the experiments.