考虑边界约束条件的悬索桥有限元模型修正研究  

Finite element model updating for a suspension bridge considering the boundary constraint conditions

作　　者：邹向农 龙俊贤 阳德高 胡朋 韩艳 ZOU Xiangnong;LONG Junxian;YANG Degao;HU Peng;HAN Yan(China Railway Wuhan Survey and Design & Institute Co.,Ltd,Wuhan 430074,China;School of Civil Engineering,Changsha University of Science & Technology,Changsha 410114,China)

机构地区：[1]中铁武汉勘察设计研究院有限公司,湖北武汉430074 [2]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《铁道科学与工程学报》2019年第5期1224-1231,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51878080,51822803);湖南省自然科学基金资助项目(2018JJ3538);湖南省教育厅科研资助项目(17C0056)

摘　　要：针对以往模型修正过程中常忽略边界约束条件影响的问题,为考虑大桥初始有限元模型中边界约束条件与实际情况的差别,以某塔梁分离的悬索桥为工程背景,以现场动载测试结果为基本依据,采用Combine14单元模拟该悬索桥加劲梁的纵向约束作用,运用响应面方法并结合大桥特点选取一系列算法组合考虑了边界约束条件对悬索桥初始有限元模型的影响,并对其进行修正。研究结果表明:考虑了边界约束条件的修正结果与悬索桥实测值更为接近,且各修正参数的修正量均在合理范围内,验证了上述考虑边界约束条件的方法在有限元模型修正中的有效性。修正后的模型可以作为该悬索桥的基准有限元模型,并可为大桥的进一步响应分析提供基础。The effects of boundary condition constraints are always ignored in the previous studies.To consider the differences between the boundary condition constraints in the bridge’s initial finite element model and those in the real bridge,a tower-beam separation suspension bridge was taken as the engineering background in the present study.Based on the dynamic loading test results in the field measurements,the Combine14 element was adopted to model the longitudinal constraint conditions of stiffening girders of the suspension bridge.By combining the response surface method with the bridge’s features,a series of algorithms were selected to consider the effects of boundary condition constraints on the bridge’s initial finite element model,and then to update its initial finite element model.The results show that the updated results with considering the effects of boundary condition constraints are much closer to the field measurements results of the suspension bridge,and the updating values of all updating parameters are in reasonable ranges,indicating that the above method of considering the effects of boundary condition constraints is effective in the finite element model updating.The updated finite element model can be taken as the baseline finite element model for the suspension bridge with providing the basic for further response analysis of the bridge.

关 键 词：有限元模型修正 边界约束条件 响应面法 动载试验 

分 类 号：U446[建筑科学—桥梁与隧道工程]