梁拱组合桥梁上部结构空间分析计算研究

Research on spatial analysis and calculation of composite beam-arch bridge superstructure

针对某一梁拱组合桥梁施工图设计复核验算,鉴于该桥结构的新型和复杂性,应用MIDAS/Civil 2006程序对其进行空间内力分析校验.在计算过程中利用梁格理论对该桥模型简化处理,建立完全由梁单元组成的简化模型,同时建立复杂的由梁、板及实体单元组成的对比模型进行对比分析,结果表明在自重和移动荷载作用下,简化模型的支座反力、结构内力或应力与对比模型符合较好,同时两模型的第一、第二竖向基频及其振型也符合较好,因此该桥在作结构整体分析时,按梁格理论简化处理后的计算结果具有足够的精度,从而为同类桥型的空间建模分析的简化处理提供一些参考和帮助.

For the construction rechecking of a composite beam-arch bridge,which is of a new type and complexity,MIDAS/Civil2006 is applied to carry out spatial analysis.Two models are established for contrast analysis.One model comprises of pure beam elements according to grillage method,while another complex model consists of beam,plate and solid elements.The result shows that under the dead weight and moving load,the support reaction,the internal force or stress distribution of the two models are in agreement,as well are the fundamental frequency and its vertical vibration of both models.So the calculation by the simplified model according to grillage method has sufficient precision for unitary analysis.It can provide some reference for spatial analysis of other similar bridges.