动力作用下钢箱连续梁桥有限元模型修正  

Under dynamic action of continuous steel box girder bridge finite element model revision

作　　者：张彬[1] 滕飞[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报（自然科学版）》2015年第7期816-820,共5页Journal of Liaoning Technical University (Natural Science)

基　　金：辽宁省教育厅科研基金项目(L2011048)

摘　　要：针对施工和使用阶段过程中,桥梁结构的受力状态不断变化,以及使用阶段多种载荷对桥梁上部结构的作用使桥梁上部结构受力状态不断变化的问题,采用有限元软件对桥梁上部结构进行分析,建立与实际情况更接近的有限元模型,更准确的模拟不同作用力对桥梁上部结构的影响.提取环境激励法下桥动态测量值作为目标函数,以纵向弹簧刚度、横向弹簧刚度、底板纵向加劲肋厚度、顶板厚度作为修正参数,对连续刚构梁桥进行模型修正.结果表明:修正后有限元模型的动力特性与实测结果的误差仅为3%,修正后的结构有限元模型可以为大桥损伤监测、整体评价以及深入研究提供可靠依据.In constructing and operational phase process, bridge structure stress condition is changing constantly, and many kinds of loads＇ effect on the bridge superstructure during operational phase makes the bridge superstructure stress condition in the unceasing change. This paper analyzed the bridge superstructure using the finite element software, established finite element model closing to the actual situation which can simulate more accurately the different bridge stress condition effecting on the superstructure. This study draws the environment drive law getting down from the bridge dynamic observed value and takes it as the objective function, takes the longitudinal spring constant, the crosswise spring constant and ledger wall longitudinal stiffening rib thickness and roof thickness as the revision parameter, and carries out the model to revise to the continual rigid frame beam bridge. The revision result indicates that after the revision, finite element model＇s dynamic performance and actual result＇s error is only 3%, and the structure finite element model after revision may provide the reliable basis for the bridge damage monitor, the whole appraisal as well as the deep research.

关 键 词：刚构梁桥 动力特性 有限元法 环境激励法 载荷试验 模型修正 

分 类 号：U446[建筑科学—桥梁与隧道工程]