钢-混凝土叠合梁自锚式悬索桥动力特性测试分析  

Dynamic testing and analysis for self-anchored suspension bridge with steel-concrete composite girder

作　　者：王天鹏 张建仁[1] 肖宏彬 孙赟[2] WANG Tianpeng;ZHANG Jianren;XIAO Hongbin;SUN Yun(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114 [2]中南林业科技大学土木工程学院,湖南长沙410004

出　　处：《地震工程与工程振动》2019年第1期206-212,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家重点基础发展研究计划(973计划)(2015CB057705);湖南省交通厅科技创新项目(201527)~~

摘　　要：针对钢-混凝土叠合梁自锚式悬索桥的结构特点,在总结以往大跨径桥梁有限元模型的基础上,采用组合有限元法以梁、板、杆、索单元建立邵阳市桂花大桥三维有限元模型,计算分析获得结构的主要频率和振型。通过现场测试获得大桥环境激励和行车激励作用下的响应时程,分析得到结构的主要频率、振型和阻尼比,引入模态置信因子对计算模态信息和实测模态信息进行比较分析,以验证数值模型和实测结果的准确性。研究结果可为全面了解钢-混凝土叠合梁自锚式悬索桥的动力特性、准确预测结构的动力响应以及类似桥梁的抗震、抗风设计提供重要依据。Based on the previous dynamic analysis models and the structure characteristics of self-anchored suspension bridge with steel-concrete composite girder,a new 3D FEM model is built up for the Guihua bridge,which includes beams,plate,bar and link elements,and the several main frequencies and modal shapes were obtained through modal analysis procedure.Time response histories of the bridge under the ambient excitation and vehicle excitation were recorded.The main frequencies,modal shapes and corresponding damping ratios of the bridge were obtained by of the field testing.MAC was employed to compare the calculated modal information with them extracted from the dynamic testing.The accuracy of the numerical model was evaluated.The results can be used to understand the dynamic behavior of the self-anchored suspension bridge with steel-concrete composite girder and to predict the dynamic response of the bridge in future studies.

关 键 词：自锚式悬索桥 钢-混凝土叠合梁 动力特性 有限元分析 测试 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]