摘要
OpenSees系统识别工具箱允许用户利用OpenSeesNavigator(Version 2.5)对桥梁或框架等结构建立弹性单元模型,然后导入该结构经历地震等激励信号后的某一阶或某几阶频率及其相应模态(这些模态可以从非线性模拟、试验或现场测试获取)后能够获取结构的弯曲刚度,并在此基础上,通过与无损下的截面弯曲刚度对比,计算相应的刚度动力变化指标,以便用来对结构进行健康状态的评估。本文以OpenSees标准算例为例,分析说明所开发的OpenSees系统识别工具箱如何用于弯曲型结构在经历地震和其他载荷以后的损伤评估。
A SHM toolbox namely SystemID toolbox using OpenSees,developed by OpenSees Navigator（Version 2.5） allows users to build models using elastic elements for bridge and frame structure,and then input a certain frequency and mode shape of the corresponding structure,for instance i-th frequency and i-th mode shape after suffering an earthquake excitation signal and so on（obtained from separate nonlinear simulation,experimentation or measurements from instrumented structures）,then flexural rigidities at nodes are determined.By comparing the results with those from the section stiffness extracted from the undamaged model,a measure of the damage index in terms of the stiffness change namely Stiffness Variation Index（SVI） can be estimated for evaluating the health state of the structure.Researched on the OpenSees standard example under excitation of seismic waves,the simulation model using the developed system identification toolbox was evaluated to verify the feasibility of assessment with the bending-type structures after earthquake or other loads.
出处
《四川建筑科学研究》
北大核心
2011年第1期7-10,共4页
Sichuan Building Science
基金
科技部国家重点基础研究发展计划项目(973计划)(2007CB714200)
