基于离线模型参数修正的结构混合试验方法  

A hybrid test method of structures based on off-line model parameter updating

作　　者：郭玉荣[1,2] 陈凡[1] GUO Yurong;CHEN Fan(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Construction Safety and Energy Efficiency,Ministry of Education,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《自然灾害学报》2021年第2期138-146,共9页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51878259,51161120360)。

摘　　要：随着结构中相同构件数量逐步增加,只取其中一个构件进行试验实测的混合试验效率会逐步下降,为此本文提出一种基于离线模型参数修正的结构混合试验方法来提高试验效率。从获取结构系统层次地震响应的目标出发,该方法先从整体结构中提取关键部分作为试验子结构进行预设加载路径的拟静力试验,然后基于试验子结构实测力-位移曲线识别出恢复力模型参数,最后将识别的模型参数用于整体结构的地震响应数值模拟。采用MATLAB和OpenSees进行了以防屈曲支撑为试验子结构的钢框架结构虚拟混合试验,结果表明,对于试验子结构性能受加载路径影响较小的情况,该混合试验方法具有较高的试验精度和试验效率。The efficiency of hybrid tests with only one element tested physically will decrease gradually as the number of identical components increases.For this reason,a hybrid test method with off-line model parameter updating is proposed to improve test efficiency.Aiming to achieve the seismic response of structures at the system level,the hybrid test is divided into three steps.Firstly,quasi-static tests of experimental substructures are performed under predefined loading paths.Then the hysteresis model parameters are identified based on the measured force-displacement curves of experimental substructures.Finally,the identified model parameters are used for numerical simulation to obtain the seismic response of structures at the system level.Utilizing MATLAB and OpenSees,virtual hybrid tests of a steel frame structure were conducted taking a buckling restrained brace as experimental substructure.The results showed that the proposed method can improve the accuracy and test efficiency of hybrid tests when the behavior of experimental substructures is not affected by loading paths.

关 键 词：混合试验 拟静力试验 参数识别 模型更新 试验效率 

分 类 号：TU317[建筑科学—结构工程] X43[环境科学与工程—灾害防治]