基于单元相对刚度系数的结构损伤识别研究  

STUDY ON STRUCTURAL DAMAGE IDENTIFICATION BASED ON THE RELATIVE ELEMENT STIFFNESS COEFFICIENT

作　　者：杜永峰[1,2] 李卓航[1] 李慧[1,2] 

机构地区：[1]兰州理工大学防震减灾研究所,兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程中心,兰州730050

出　　处：《工业建筑》2013年第8期39-42,共4页Industrial Construction

基　　金：国家自然科学基金项目(50978130)

摘　　要：提出了一种基于单元相对刚度的结构损伤识别方法。该方法以结构刚度变化率为损伤指标,定义结构的相对刚度系数,利用特征方程,通过矩阵变换得到结构损伤指标的相对刚度系数表达式,采用快速傅里叶FFT与贝叶斯相结合的方法(Fast Bayesian FFT)识别结构的模态参数,计算相对刚度系数,进而得到结构的损伤指标,便同时得到结构的损伤程度和损伤位置。利用Simulink模拟结构响应,识别结构模态参数,计算损伤指标判断结构损伤。结果表明,基于单元相对刚度系数的方法能利用较少的模态参数,实现单损伤和多损伤的定位和损伤程度识别,具有一定的抗噪能力,且精度较高。A kind of damage identification method was proposed based on relative element stiffness coefficient.Damage index of structure was defined as the ratio of the variation of relative element stiffness to the undamaged one,relative element stiffness was a function of modal parameters.Then,utilizing the modal parameter,damage of structure can be identified clearly.On the basis of soft Simulink,a structure was used to demonstrate the feasibility of the presented method,the relative stiffness of damaged and undamaged structure was calculated,and then damage index was required as defined.The results showed that the method could efficiently identify the damage position and degree of structure.

关 键 词：损伤识别 模态参数识别 贝叶斯模态参数识别 多损伤 

分 类 号：TU312.3[建筑科学—结构工程]