基于频率的叠层橡胶隔震支座损伤识别研究  

Frequency based damage identification of laminated rubber isolation bearing

作　　者：吴巧云 王宏伟 冯海 黄映红 荆国强 丁兰 WU Qiao-yun;WANG Hong-wei;FENG Hai;HUANG Ying-hong;JING Guo-qiang;DING Lan(State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430034,China;School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430073,China;China Power Construction Engineering Consulting Central Southern Co.,Ltd.,Wuhan 430071,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]桥梁结构健康与安全国家重点实验室,湖北武汉430034 [2]武汉工程大学土木工程与建筑学院,湖北武汉430073 [3]中国电力建设工程咨询中南有限公司,湖北武汉430071 [4]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《振动工程学报》2024年第7期1230-1238,共9页Journal of Vibration Engineering

基　　金：桥梁结构健康与安全国家重点实验室开放课题(BHSKL19-07-GF);武汉市城建委科技计划项目(武城建[2020]27号);国家自然科学基金资助项目(52078395,51908521);湖北省首届青年拔尖人才计划项目。

摘　　要：提出一种基于自振频率的叠层橡胶隔震支座的损伤识别方法。通过叠层橡胶隔震支座的周期结构特性,利用周期结构特征波导纳法,推导自振频率与基本周期单元整体剪切模量变化之间的关系,建立自振频率变化率对单元损伤的敏感性识别方程组,并采用约束优化方法求解该识别方程组,实现基于自振频率变化的叠层橡胶隔震支座的损伤识别。算例模型考虑了上部结构对底层橡胶支座的影响,使计算模型更加符合工程实际。通过三维有限元数值仿真分析验证了本文所提损伤识别方法的有效性和精确性。A damage identification method of laminated rubber bearing based on its natural frequency is proposed in this paper.Through the periodic structural characteristics of laminated rubber bearings and the characteristic waveguide nano method of the pe⁃riodic structure,the relationship between the natural frequency and the change of overall shear modulus of the basic periodic unit is deduced,and the sensitivity identification equations of the rate of natural frequency change to unit damage is established.The iden⁃tification equation set is solved by the constrained optimization method.The damage identification of the laminated rubber isolation bearing based on the change of natural frequency is therefore realized.The example of the calculation model considers the influence of the upper structure on the rubber bearing at the bottom layer,which makes the calculation model more in line with practical engi⁃neering.The effectiveness and accuracy of the damage identification method proposed in this paper is verified by the three-dimen⁃sional finite element numerical siulation analysis.

关 键 词：损伤识别 叠层橡胶隔震支座 敏感性分析 周期结构 自振频率 

分 类 号：O346.5[理学—固体力学] TU352.12[理学—力学]