摘要
实际消能减震建筑结构的监测数据通常不完备,其有限元模型修正问题具有解病态和计算耗时等特征。研究了一栋油阻尼器建筑结构的有限元模型修正问题,为解决模型修正的病态性,提出了一种结构系统层次的模型修正策略,并建议了一种贝叶斯模型修正方法。首先,在初始有限元模型基础上新增待识别剪切型模型,新增模型可视为对初始模型的系统层次修正。其次,采用模态敏感性分析量化新增模型参数的重要性,选择重要模型参数作为待修正量。然后,基于结构地震监测数据,采用贝叶斯统计推断方法估计模型参数的后验概率分布,用于验证模型参数的可识别性和修正策略的有效性。最后,以一组实际地震监测数据为例,说明上述有限元模型修正方法的有效性。
The structural measurements of actual passively controlled structures are often incomplete.The process of updating the model of such structures is typically ill-conditioned and can be computationally challenging.This study investigated the process of updating the model of a building equipped with oil dampers.To address the ill-conditioned issue,an effective system-level strategy for model correction is presented,and a Bayesian inference approach is proposed to update the model.First,a simple,shear-type supplementary model is superimposed onto the initial finite element(FE)model of the building.This supplementary model belongs to the group of system-level model correction.Subsequently,modal sensitivity analysis is carried out to quantify the importance of the updating parameters of this supplementary model.These parameters are grouped and reduced into a few important parameters,which are eventually used in the model update.Then,a Bayesian inference approach is employed to estimate the posterior distribution of the updating parameters using earthquake measurements,and the identifiability of the parameters and the effectiveness of the proposed correction strategy are verified.Finally,a set of the earthquake measurements of the investigated building is selected to demonstrate the effectiveness of the proposed approach for updating the model.
作者
杨朋超
薛松涛
谢丽宇
Yang Pengchao;Xue Songtao;Xie Liyu(Tongji University,Shanghai 200092,China;China Construction Eight Engineering Division Co.,Ltd.Shanghai 200112,China;Tohoku Institute of Technology,Sendai 982-8577,Japan)
出处
《土木工程学报》
EI
CSCD
北大核心
2021年第S01期13-19,47,共8页
China Civil Engineering Journal
基金
国家自然科学基金(51778490)
关键词
消能减震结构
有限元模型修正
系统层次修正
贝叶斯统计推断
地震监测数据
passively controlled building structure
finite element model update
system-level correction strategy
Bayesian inference
earthquake measurements
作者简介
杨朋超(1988—),男,博士,工程师。主要从事结构健康监测和贝叶斯数据分析方法方面的研究,E-mail:murphy_ypc@126.com;薛松涛(1963—),男,博士,教授,日本外籍工程院院士。主要从事结构健康监测方面的研究;谢丽宇(1978—),男,博士,副教授。主要从事结构健康监测和智能传感器方面的研究。
