基于SDRA的移动车辆载荷作用下桥梁动力响应分析

Dynamic response analysis of bridge under moving vehicle loads based on SDRA

为直观反映结构振动时的响应状态,开发出具有较好人机交互界面的结构动力响应分析有限元计算程序系统SDRA,实现FORTRAN数值计算功能与VB的界面设计和图形开发功能的无缝链接.车辆在桥梁上行驶时,SDRA可实时监测桥梁动力响应的全过程并将计算结果以字符和动画的方式显示在VB界面上.对于变速行驶在桥面上的车辆出现紧急刹车的现象,考虑车轮与桥面间的摩擦并引入冲击因数模拟刹车力对桥面的作用,探讨摩擦因数与冲击因数对车桥耦合振动的影响.算例表明SDRA的计算结果可靠且具有友好的前、后处理界面.

To reflect the vibration state of some structures,a structural dynamic response analysis finite element computation software with a good interactive interface is developed,which is named SDRA.A seamless connection is implemented between the numerical computation function of FORTRAN and the functions of interface design and graphics development of VB.The whole process for the dynamic response of a bridge subject to some moving vehicles can be monitored by SDRA in real time,and the computation result can be displayed on the VB interface in symbols and animations.For the case that a vehicle brakes suddenly on the bridge at a variable velocity,the friction between wheels and bridge deck is considered,and the action of braking forces to the bridge deck is simulated by introducing impact factor.The effect of friction factor and impact factor on the vehicle-bridge coupling vibration is discussed.The examples show that the calculation results of SDRA are reliable and have a friendly interface for pre-processing and post-processing.