Finite element model updating and validating of Runyang Suspension Bridge based on SHMS  

基于结构健康监测的润扬悬索桥有限元模型修正与验证(英文)

作　　者：王浩[1] 李爱群[1] 缪长青[1] 

机构地区：[1]东南大学土木工程学院,南京210096

出　　处：《Journal of Southeast University(English Edition)》2005年第4期474-479,共6页东南大学学报（英文版）

基　　金：TheNationalNaturalScienceFoundationofChina(No.50378017),theExcellentDoctoralDissertationFundofSoutheastUniversity(No.YBJJ0508).

摘　　要：Based on the finite element （FE） program ANSYS, a three-dimensional model for the Runyang Suspension Bridge （RSB） is established. The structural natural frequency, vibration mode, stress and displacement response under various load cases are given. A new method of FE model updating is presented based on the physical meaning of sensitivity and the penalty function concept. In this method, the structural model is updated by modifying the parameters of design, and validated by structural natural vibration characteristics, stress response as well as displacement response. The design parameters used for updating are bounded according to measured static response and engineering judgment. The FE model of RSB is updated and validated by the measurements coming from the structural health monitoring system （SHMS）, and the FE baseline model reflecting the current state of RSB is achieved. Both the dynamic and static results show that the method is effective in updating the FE model of long span suspension bridges. The results obtained provide an important research basis for damage alarming and health monitoring of the RSB.采用大型有限元分析软件ANSYS建立了润扬悬索桥的三维有限元模型并对其进行了自振特性分析,同时计算了各种工况下大桥的应力及位移响应.基于灵敏度的物理意义以及罚函数的思想,提出了一种结构有限元模型修正的新方法.该方法仍以自振特性为目标函数,以结构设计参数为待修正参数,但设计参数的上下限根据测试所得静力响应值和理论值的对比以及工程经验来确定,因此静力响应可用于验证修正后的有限元模型.采用结构健康监测系统数据及提出的方法对大桥有限元模型进行了修正与验证,得到了能够较好地反映大桥整体动静力性能的有限元基准模型,为润扬悬索桥的健康监测和损伤预警提供了研究基础.

关 键 词：suspension bridge finite element model updating model validating baseline model structural health monitoring system （SHMS） 

分 类 号：U442[建筑科学—桥梁与隧道工程] U448[交通运输工程—道路与铁道工程]