斜拉板桥的动力分析模型

Modelling of Slab stayed Bridge for Dynamic Analysis

以某铁路斜拉板桥方案为例，探讨斜拉板桥的动力分析模型。文中将由普通钢筋混凝土板和斜拉索构成的斜拉板用格栅单元和空间杆单元模拟，并假定两类单元之间变形协调；主梁、桥塔和桥墩均离散为空间梁单元，且在主梁与桥塔之间以及主梁与斜拉板之间设置刚臂单元，从而建立了斜拉板桥的全桥分析模型。在此基础上分析了方案桥的动力特性，所得结果可供设计参考。

The mathematical model of slab stayed bridge for dynamic analysis is discussed with a railway slab stayed bridge project as an example.In the paper,the diagonal tension slabs,made up of concrete slabs and cables,are modeled by grid elements and space bar elements,and hypothesized deformation compatibility between the two type elements.The girder,the bridge towers and the bridge piers are all idealized with space beam elements,and rigid elements are used at connections between the girder and towers as well as the girder and the diagonal tension slabs.Then a completed bridge model of the bridge project is established.Based on the model,the analysis of dynamic characteristic is performed.The result obtained can be used for reference in design.