下承式钢桁架桥动力特性有限元分析

摘要

The paper studies the modal analysis with finite element analysis software of MIDAS / CIVIL 2010 about the through truss steel bridge in Nanchang, educe dynamic characteristics of the mode shapes and natural frequencies of values, seek the deformation of the overall structure of the bridge, and-find out the structure of the actual stress and variation, it is an important starting point to optimization design , harmonic analysis, transient analysis and spectral analysis of kinetic analysis.%采用有限元分析软件MIDAS/CIVIL 2010对南昌某下承式钢桁架桥进行离散,建立空间有限元分析模型,并对其进行动力特性分析,得到振型及自振频率等数值,寻求桥梁整体结构的变形规律,并了解结构的实际受力情况和变化规律,是今后的优化设计,谐响应分析,瞬态分析及谱分析等动力学分析的重要起点.