公路车桥耦合振动响应计算方法对比研究

使用有限单元方法,分别建立了桥梁结构的振动计算模型和车辆的振动计算模型,考虑车桥接触点的位移连续,分别提出了考虑桥梁全自由度的车桥耦合振动模型和使用桥梁振动模态的模态综合计算模型。将桥梁结构的振动响应计算转化为求解模态广义坐标,并结合车辆振动与桥面的耦合,建立结构模态广义坐标和车辆振动自由度耦合的系统方程,使用Newmark-β数值积分方法对时变耦合系统进行求解。为了验算方法的有效性和可靠性,分别计算了平面梁在集中力作用下,空间板结构在整车模型作用下的振动响应,研究结果表明,使用模态综合法求解公路桥梁车桥耦合振动响应的结果可靠,并有很高的计算效率,该方法具有广泛的适用性。

Comparative Research on the Calculating Methods for Coupling Highway Vehicle-bridge System

According to the displacement continuum condition of the vehicle-bridge contacting point,the calculating models for bridges structure vibration and the vehicle structure vibration are established,by using the finite element method.Both of the full size method and modal general method are provided for coupling vehicle and bridge vibration.Based on the coupling the vehicle and the bridges surface,the vibration system in which the calculating of the bridge structure vibration responses is transformed into the elevating of the generalized coordinate is obtained.And theNewmark-β] direct integration strategy is adopted to solve the coupling system.In order to check the accurateness and effectiveness,some numerical examples are performed and the results are well satisfied with other method.The research results demonstrate that the modal general method is effective and accurate.