基于ANSYS对大型钢桁桥的模态分析

摘要

Modal analysis is the foundation of dynamic analysis, and it takes an important part in structral dynamic analysis. At the beginning of this paper, we diseribed the basic theory of modal analysis,establishing a dynamic model of a large truss steel bradge with ANSYS,and then we got the natrual frequency and mode shape. At last, we used midas/civil to analyze the bradge, and compared the results with ANSYS,and it showed that modal analysis based on ANSYS is credible.%模态分析是动力学分析的基础,在结构动力学分析中具有重要作用.本文对模态分析的理论进行了概述,使用大型通用有限元软件ANSYS建立了某大型钢桁桥的三维动力学模型,得到了该桥的各阶固有频率和振型,最后通过与Midas/civil桥梁专用软件的分析结果进行了对比,表明ANSYS的分析结果是可靠的.