【摘要】 通过对跨度为(100+150m)的机库桁架屋盖结构的现场环境激励结构动力特性测试,利用谱分析方法对实测数据进行了分析,得出了结构的自振频率和振型。采用结构分析软件Midas建立屋盖的空间模型,采用特征向量法,得到了该结构的动力固有特性。有限元计算结果与动力试验结果在前3阶基本周期有相同的差异,各自所对应的振型吻合较好。结果表明环境激励下识别出该屋盖的低阶模态,可作为该机库的有限元模型修正和健康监测的基础。更多还原

【Abstract】 Through site environment incentive structure dynamic characteristics test for span of(100+150m) hangar roof structure,the vibration frequency and vibration mode of structure were obtained,based on the analysis of measured data by spectral analysis.Using structural analysis software Midas to build roof space model,and the structure dynamic characteristics obtained by using eigenvector method.Obtained results of finite element calculation and dynamic test in the first 3 order basic cycle have the same difference,their corresponding vibration modes are in good coincide.Results show that the environmental vibration response can identify the roof of low order mode,and can be used as foundation of hangar finite element model updating and health monitoring.更多还原