装配式钢桁架桥振动模态分析与试验研究

桥梁结构的动力学特性是其结构分析与优化设计的基础,以某型装配式钢桁架桥为研究对象,利用有限元软件ANSYS建立了该桥的三维空间有限元分析模型,并采用分块兰索斯法对其进行了模态分析,得到了桥梁的10阶固有频率和振型,而后基于环境激励的工作模态试验方法开展试验研究,通过试验数据的对比,验证了该分析方法的可靠性,为该型钢桁架桥的动力特性分析提供了直接的数据支持。

The vibration modal analysis and experiment of prefabricated steel truss bridge

The dynamic characteristics of bridges are the basis of structural analysis and optimization design, this paper set the prefabricated steel truss bridge as study focus, using ANSYS to establish the three-dimensional space finite element model of steel truss bridge, and carried out modal analysis using Block Lanczos method, ten mode natural frequencies and vibrations were obtained, then we conducted modal experiments using operating modal analysis method based on ambient excitation and compared the test data, through which validated the reliability of the analysis method of this paper, which offered direct data support to the dynamic analysis of prefabricated steel truss bridge.