移动荷载作用下预应力空心板桥动力响应分析

Dynamic Response Analysis of Prestressed Concrete Hollow Slab under Moving Load

为直观反映预应力空心板桥结构振动时的响应状态,以大型有限元软件ANSYS为平台,建立有限元模型,对预应力空心板桥的结构动力特性进行分析,并且在模型中考虑材料的非线性影响。利用有限元计算法,得出桥梁结构的频率和前4阶模态,分析对称荷载、偏载和汽车在20 km/h,40 km/h 2种不同速度行驶工况下桥梁结构的动力响应,为桥梁的安全运行提供技术参考。

To reflect the response state of the structural vibration on prestressed hollow slab bridge intuitively, finite element model is established and dynamic characteristics of the prestressed concrete hollow slab have been carried on the analysis, with large - scale finite element software ANSYS as a platform. Besides, the material nonlinear effect is also considered in the model. The bridge structural frequency and the former 4 modals are obtained by using the finite element calculation. Then, the symmetrical load, partial load and the dynamic response of bridge structure of two different car speed -20 km/h, 40 km/h are analysed, thus providing technical reference for safe operation of the bridge.