刚度突变MDOF体系动力损伤识别  

The Dynamic Damage Identification of Stiffness Mutation Mdof System

作　　者：高军[1] 杜修力[1] 李立云[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《震灾防御技术》2009年第3期321-327,共7页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金重点项目(50838001);北京市教委科技创新平台(4700001401509)

摘　　要：在结构损伤识别中,损伤发生的时间、损伤定位及损伤程度是三个核心问题。本文利用HHT方法结合经验遗传-单纯形算法分析刚度突变MDOF体系在地震波输入下结构的动力损伤识别问题,并以刚度突变4DOF结构体系在ELCentro地震波输入下结构动力特性识别为例进行了讨论。通过Fourier变换得到了结构损伤后的自振频率,利用HHT方法识别出结构损伤发生的时间,在此基础上运用经验遗传-单纯形算法识别出结构损伤后的刚度,从而确定了损伤的程度。The time of injury, damage location, and damage degree are the core factors of damage identification. In this paper, we conduct the comprehensive analysis of the Hilbert-Huang transform and Genetic-Simplex Algorithm in the dynamic damage identification of stiffness mutation MDOF system under the seismic loading, by taking a 4DOF system under the EL Centro seismic loading as an example. With the Fourier transform of the particle’s absolute acceleration time-history curves, the system’s inherent frequencies can be identified. The moment of stiffness mutation can be identified with Hilbert-Huang transform, and the particle’s stiffness can be recognized with empirical Genetic-Simplex algorithm.

关 键 词：FOURIER变换 HHT方法 经验遗传-单纯形算法 刚度突变MDOF体系 损伤识别 

分 类 号：TU312.3[建筑科学—结构工程]