汽车荷载作用下铰接板梁桥的空间动力响应分析

Spatial dynamic response of hinge joint voided slab bridge due to moving vehicles

以实际工程为背景,运用ANSYS软件建立铰接板梁桥有限元分析的空间模型,分析桥梁的动力特性,获得桥梁的动力分析模型,并编制车桥相互作用的求解程序,求解汽车荷载作用下桥梁的空间动力响应,采用此法能较全面地描述车桥相互作用情况.铰接板桥振动具有空间特性,横向间各板块共同参与工作,按梁模型计算结果明显偏小,这是不安全的.按桥梁空间模型求解桥梁动力响应,所得结果与实测结果相近.算例表明本方法适合于对此类型的桥梁进行动力响应分析.

According to the actual project, spatial model of finite element analysis of hinge joint void-ed slab bridge is established by ANSYS software. We analyze dynamic characteristics of established bridge model, obtain dynamic analysis model of bridge, and compile the program of vehicle-bridge inter-action to solve dynamic response of bridge due to moving vehicles. Using this method can describe the sit- uation of vehicle-bridge interaction comprehensively. Vibration of hinge joint voided slab bridge has spa-tial characteristics, and all the slabs are participate in the work in the lateral direction. The dynamic response obtained by beam model is obviously too small, which is unsafe. But using spatial model to solve dynamic response of bridge obtains similar results with experiment. Examples show that this method is suitable for dynamic response analysis of this type of bridge.