大跨度预应力混凝土连续梁桥模态分析与模型修正  

Modal Analysis and Model Updating of Large Span Prestressed Concrete Continuous Girder Bridge

作　　者：刘沩[1] 张国刚[2] 

机构地区：[1]湖南省高速公路管理局,长沙410082 [2]湖南省交通规划勘察设计院,长沙410008

出　　处：《工程建设》2017年第6期13-17,69,共6页Engineering Construction

摘　　要：对某座大跨度预应力混凝土连续梁桥进行了环境激励法模态测试,分别采用峰值法(PP)和随机子空间法(SSI)进行了模态参数识别;建立该桥的全桥三维初始有限元模型,以实测模态参数为依据,采用基于灵敏度分析的模型修正技术对初始限元模型进行了模型修正,模型修正效果良好,得到了能够反映实际的基准有限元模型,为该桥后期运营过程中的结构健康状态监测、评估、维修与加固提供参考依据。An ambient vibration field-testing on a large span prestressed concrete girder continuous bridge was conducted,and the experimental modal analysis was also carried out using two methods of peak-picking（ PP） and stochastic subspace identification（ SSI）. The 3-D finite element model（ FEM） was constructed and a theoretical modal analysis was performed to generate dynamic characteristics of the bridge,then model updating was done based on the experimental modal results,and the baseline FEM was constructed. The updated FEM can serve as a baseline in the long-term health monitoring,condition evaluation and maintenance of the bridge in service.

关 键 词：桥梁工程 模态分析 模型修正 连续梁桥 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]