基于静动力测试的混凝土T形梁有限元模型修正  

Finite element model updating of concrete T-beams based on static and dynamic testing

作　　者：徐恒志 刘才玮[1] 苗吉军[1] 肖建庄[2] 张铭良 XU Heng-zhi;LIU Cai-wei;MIAO Ji-jun;XIAO Jian-zhuang;ZHANG Ming-liang(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;Department of Building Engineering, Tongji University, Shanghai 200092, China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033 [2]同济大学建筑工程系,上海200092

出　　处：《青岛理工大学学报》2020年第5期45-51,共7页Journal of Qingdao University of Technology

基　　金：国家自然科学基金资助项目(51608289);中国博士后基金资助项目(2018M632640);山东省博士后创新项目(2019057);青岛市博士后应用研究项目(2018103);"山东省"双一流"建设工程-土木"资助项目。

摘　　要：为建立适用于混凝土T形梁的有限元模型,以钢筋混凝土T形简支梁为研究对象,利用联合静动力的有限元模型修正方法对混凝土T形叠合梁进行模型修正.首先利用ANSYS建立混凝土T形简支梁有限元模型,根据工程经验初选混凝土弹性模量等待修正参数.构造实测响应与相应响应差值的目标函数,通过灵敏度分析,筛选待修正参数并设定待修正参数取值区间,在区间内选取5组随机的参数值作为“试验”模型,利用联合静动力的修正方法对参数进行迭代修正,修正后模型的静动力响应计算值与“试验”值吻合较好.在简支梁的基础上,将此修正方法推广到三跨连续梁,修正结果良好,验证了该方法的适用性和准确性.In order to establish a finite element model suitable for concrete T-beams,this paper takes simply supported reinforced concrete T-beams as the research object and uses the finite model updating method of combined static and dynamic test to modify the model of concrete composite T-beams.First,the finite element model of concrete T-shaped simply supported beam is established by ANSYS,and the parameters such as elastic modulus of the concrete are selected according to engineering experience.The objective function for the difference between the measured value and the calculated value of response is constructed.Through sensitivity analysis,it screens the final parameters,and sets the value interval of the parameters.Five groups of random parameter values are selected as the“test”model in the interval.The parameters are modified iteratively by the combined static and dynamic updating method.The static and dynamic response calculation value of the modified value is in good agreement with the“test”value.On the basis of simply supported beams,the modified method is extended to three-span continuous beams,and the modified result is good,which verifies the applicability and accuracy of the method.

关 键 词：钢筋混凝土 有限元模型修正 联合静动力测试 钢筋混凝土T形梁 

分 类 号：TU375.1[建筑科学—结构工程]