梁桥受移动荷载作用的数值模拟  

Numerical simulation on bridge under a moving load

作　　者：蒲军平[1] 王晓臣[1] 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310032

出　　处：《浙江工业大学学报》2007年第2期228-230,共3页Journal of Zhejiang University of Technology

摘　　要：移动车辆通过桥梁时将发生动力耦合作用使桥梁和车辆产生强烈的振动,其振动方程为时变系数微分方程,载荷与动态响应在时域中呈卷积关系,用解析的方法求解这类问题有很大的局限性,解决这类问题的最为有效的工具之一是数值方法中的有限单元法.使用动力有限单元法对移动交变载荷作用下的梁桥结构的动力响应过程进行了数值模拟,对于Euler-Bernoulli梁单元采用二节点的Hermite插值函数,在对时程直接积分时采用了Newmark方法,得到了良好的数值模拟结果.A dynamically coupled interaction will cause vibrations of bridges and vehicles when vehicles or trains are passing a bridge. The vibration differential equation is a time-variation system and there is a convolution integral for load on the dynamic response in time-region. There is a quite localization for solving such kind of questions by analysis methods. Among numerical methods, the Finite Element Method is one of the available methods for the questions. Numerical simulation has been carried out for dynamic response of the bridge structure under a moving alternate cosine load using Dynamic Finite Element Method. Euler-Bernoulli beam element has been adopted and Hermite interposition function of two-nodes has been utilized. Newmark method has also been used in direct time-integral and some good results of numerical simulation have been obtained.

关 键 词：移动荷载 动力响应 数值模拟 梁桥 

分 类 号：O327[理学—一般力学与力学基础]