铁路简支梁桥下部结构健康状态动力评估方法研究  

Study on dynamic evaluation method for substructures of railway simply-supported bridges

作　　者：战家旺[1] 闫宇智 张楠[1] 夏禾[1] Zhan Jiawang Yan Yuzhi Zhang Nan Xia He(Beijing Jiaotong University, Beijing 100044, China)

机构地区：[1]北京交通大学,北京100044

出　　处：《土木工程学报》2016年第10期71-79,共9页China Civil Engineering Journal

基　　金：中国铁路总公司科技研究开发计划项目(2015G006-M);国家973计划(2013CB036203)

摘　　要：提出一种以实测横桥向整体振动、横桥向局部振动和顺桥向局部振动模态的不同组合为输入,采用模型修正技术和优化算法识别铁路简支梁桥下部结构的物理参数,从而实现对墩身、基础和支座病害进行定位和定量分析的动力学方法。进一步,建立了针对下部结构系统中各构件的评估准则和评估流程。对两座铁路桥梁进行现场试验,并依据所提评估方法和评估准则对其健康状态进行评估,理论分析结果现场评估结果一致,从而证明所提方法的准确性和有效性。A dynamic evaluation method for railway simplified-supported bridge substructures based on modal parameters and optimization theory is proposed. With different combinations of measured lateral integral, lateral local and longitudinal local vibration mode parameters as input data, the FE model updating technique is used to identify the physical and mechanical parameters of substructures, so that damage of pier shaft, foundation and bearings in the substructure system can be located and quantified. Furthermore, the evaluation criteria and evaluation procedure for health condition are established to assess the integral and local health conditions of members in substructure system. Two railway bridges were tested and their health conditions were evaluated based on the proposed evaluation criteria. The analysis results agree well with the in-situ evaluation results, validating the effectiveness and accuracy of the dynamic evaluation method proposed for railway simply-supported bridge substructures.

关 键 词：铁路简支梁桥 下部结构 健康状态 动力评估 有限元模型修正技术 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]