钢桁梁悬臂施工状态模态试验及有限元分析  

MODAL EXPERIMENTAL AND FINITE ELEMENT ANALYSIS TO A CANTILEVER CONSTRUCTED STEEL TRUSS GIRDER

作　　者：胡帮义 袁向荣[2] 肖先波[1] 张能胜[1] 张水舰[1] HU Bangyi;YUAN Xiangrong;XIAO Xianbo;ZHANG Nengsheng;ZHANG Shuijian(Institute of Architectural Engineering,Huzhou Vocational and Technology College,Huzhou 313000,China;School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]湖州职业技术学院,浙江湖州313000 [2]广州大学土木工程学院,广州510006

出　　处：《钢结构》2018年第8期106-109,共4页Steel Construction

基　　金：国家自然科学基金项目(51078093;51278137);广州市科技计划项目(12C42011564)

摘　　要：为了获得钢桁梁在悬臂拼装施工状态的振动特性参数,以便对钢桁梁施工阶段的有限元计算模型进行校核;加工制作了某钢桁梁试验模型,采用DASP动态测试系统实测了模型梁的频率和振型,基于实测结果采用有限元计算软件MIDAS对钢桁梁模型进行了有限元分析,间接识别了螺栓的连接刚度。模型试验结果表明:模态试验测得钢桁梁悬臂施工状态的前3阶振型与有限元计算的振型基本吻合;基于修正后的有限元计算模型模态分析结果与实测结果误差小于4%,修正后的模型较好地模拟了结构的实际状态。In order to obtain the parameters of vibration characteristic of a cantilever installation constructed steel truss girder,and to check for the finite element analysis model of the steel truss girder,the laboratory model of a steel truss girder was built. By using the dynamic test system DASP,the vibration modes and frequencies were measured. Based on the measured results,the trials and analysis were made by using the finite element analysis software MIDAS. For that,the bolted connection stiffness was identified successfully. The model test results showed that,the first three modes of vibration obtained by modal test were basically the same as the results obtained by finite element analysis,the relative error between the measured results and finite element modal analysis results based on the corrected model was less than 4%,and the corrected model well simulated the actual structure.

关 键 词：钢桁梁 悬臂施工 模态分析 有限元分析 参数识别 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]