采用改进单元刚度折减系数法识别结构损伤  

DAMAGE IDENTIFICATION BASED ON IMPROVED ELEMENTAL STIFFNESS REDUCTION FACTOR

作　　者：曹晖[1] 张新亮[1] 曹永红[1] 李英民[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《振动与冲击》2008年第6期132-135,139,共5页Journal of Vibration and Shock

摘　　要：提出了结构损伤识别的两阶段方案,在利用改进的损伤变量进行损伤定位的基础上,采用前几阶振型扩充得到完备模态空间,结合改进的单元刚度折减系数方法进行损伤定量。分别选取了简支梁和连续梁仿真算例进行验证。结果表明在仅采用较少低阶模态的情况下,识别效果比原损伤变量和单元刚度折减系数法明显更优,能在一定噪信比下进行较准确的损伤定位和定量分析。A two-stage damage identification scheme is proposed.Firstly,the scheme locates damage using improved damage variable indicator.Then a complete modal space is constructed with only a few lower modes to quantify damage by means of improved elemental stiffness reduction factor(ESRF).A simply supported beam and a continuous beam with different damage scenarios are selected as case study to compare the performance of the ESRF and the proposed scheme.The results show that the suggested scheme is better than the ESRF when only few lower modes are utilized,and it could both localize and quantify damage at a certain noise-signal ratio.

关 键 词：损伤识别 模态参数 刚度折减系数 完备模态空间 噪信比 

分 类 号：TU311[建筑科学—结构工程]