摘要
为提高利用最小二乘进行模态参数识别的精确度,提出了分频段加权最小二乘模态参数及损伤区域识别方法。分别基于各频率段能量和普通克里金插值作为权值,加权计算模态参数。将此方法应用于识别时变系统,用于Koyna混凝土重力坝在地震作用下损伤识别中。结果表明,识别的固有频率时程曲线可以准确地对结构损伤情况进行描述,根据坝体观测点在初始和损伤结束时刻的响应信号识别的归一化振型可以对结构损伤进行定位。该方法可以较大地提高结构模态参数的识别精度,并且准确地识别结构的损伤区域。
In order to improve the accuracy of modal parameter identification using least squares,a frequen⁃cy-band weighted least squares modal parameter and damage region identification method is proposed.Re⁃spectively based on the respective frequency bands and the energy as ordinary Kriging weights,weighted modal parameters.This method is used to identify time-varying system and to identify damage of Koyna con⁃crete gravity dam under earthquake.The results show that the time history curve of the identified natural frequency can accurately describe the structure damage,and the damage can be located according to the normalized vibration pattern recognized by the response signals at the initial and the end of the damage.The proposed method can improve the identification accuracy greatly of structural modal parameters and ac⁃curately identify the damage area of the structure.
作者
徐强
刘博
陈健云
李静
徐舒桐
XU Qiang;LIU Bo;CHEN Jianyun;LI Jing;XU Shutong(State Key Labor of Coastal and Offshare Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Eartquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《水利学报》
EI
CSCD
北大核心
2020年第1期23-32,共10页
Journal of Hydraulic Engineering
基金
国家重点研发计划项目(2017YFC0404903)。
关键词
参数识别
普通克里金加权
损伤区域识别
加权最小二乘法
信号分析
parameter identification
common Kriging weighting
damage area identification
weighted least squares method
signal analysis
