大跨度拼装式钢桥导梁推送过程动力特性有限元分析及模态试验

Finite Element Analysis and Modal Test of Dynamic Properties of the Large Span Assembly Type Steel Bridge during the Guide Beam Pushing Process

摘要: 大跨度拼装式钢桥导梁推送过程中结构振动明显，通过有限元软件建立了导梁推送过程典型工况的空间梁壳动态分析模型，采用无线环境激励模态测试系统进行了结构自振特性测试，将动态试验结果与有限元计算结果进行对比分析，确定了结构的动力特性，并验证了有限元模型的正确性，可为进一步研究该类型桥梁的动态建模、动力学分析、振动控制、抗风设计等提供参考。

Abstract: Structure vibration of the large span assembly type steel bridge during the guide beam pushing process is obvious. The dynamic analysis model based on the spatial beam element and spatial shell element of the typical condition in the guide beam pushing process is established by the finite element software. The wireless ambient excitation modal test system is employed to test the natural vibration characteristics of the structure. Then the dynamic test results are compared with the finite element calculation results, which derives the dynamic properties of the structure and verifies the correctness of the finite element model. The study results of this paper could provide reference for dynamic modeling, dynamics analysis, vibration control, wind-resistance design etc. of this type of bridge.