摘要
为研究地震作用下古建筑木结构层间抗侧能力损伤和识别,根据缩尺比为1∶3.52殿堂式古建筑木结构振动台试验,分析不同地震损伤下模型层间等效抗侧刚度、侧移响应及侧移对刚度损伤的敏感性.在考虑柱脚滑移的结构简化力学模型基础上,推导模型的状态方程和观测方程.考虑试验环境噪声干扰,利用奇异值分解偏最小二乘(PLS-SVD)和扩展卡尔曼滤波(EKF)方法定量识别模型等效抗侧刚度.结果表明,随着地震损伤增加,结构层间等效抗侧刚度比减小、侧移峰值对柱架层结构损伤较乳层敏感.无损工况下结构等效抗侧刚度识别误差在10%左右;损伤工况下结构等效抗侧刚度识别误差为15%～20%.通过明代古建筑木结构西安钟楼等效抗侧刚度在线识别,验证了PLS-SVD和EKF方法可为古建筑木结构等效抗侧能力监测和震前抗倒塌预警提供理论依据.
In order to study the inter-story lateral stiffness damage and identification of ancient wooden structures under strong earthquakes,the inter-story lateral stiffness,lateral displacement response and the sensitivity of displacement to stiffness were analyzed by the shaking table test of an ancient timber frame with a scale ratio 1:3.52.Based on the simplified mechanics model considering the column sliding,the structural state equation and observation equation were deduced.Considering the influence of noise,the lateral stiffness was identified by means of Partial Least Squares-Singular Value Decomposition (PLS-SVD) and Extended Kalman Filter (EKF).The analysis results show that the ratio of inter-story lateral stiffness gradually decreases with the increase of seismic damage.The damage of column layer is especially sensitive to the increase of lateral displacement.The identified error of the lateral stiffness is about 10% without damage.Under the damage condition,the identified error of the lateral stiffness is about 15%~20%.Through the lateral stiffness identification of Bell Tower of Xi'an,it indicates that the method of PLS-SVD and EKF has high accuracy and good applicability,and can provide a theoretical basis for monitoring the change of lateral stiffness and offering warning before structural collapse.
作者
薛建阳
白福玉
张锡成
周超锋
XUE Jianyang;BAI Fuyu;ZHANG Xicheng;ZHOU Chaofeng(School of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第1期55-64,共10页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51678478)
陕西省自然科学基础研究基金资助项目(2016JQ5060)
陕西省教育厅科研计划项目(15JK1444)~~
关键词
古建筑木结构
抗侧刚度
地震损伤
识别
ancient wooden structure
lateral stiffness
seismic damage
identification
