基于奇异信号的钢桁-砼组合梁损伤识别  

Damage Identification of Steel Truss-concrete Composite Beams Based on Singular Signal

作　　者：冯麟 周志祥[1,2] 张鑫[1] 唐亮[1] 雷杨崑 周孝桂 FENG Lin;ZHOU Zhixiang;ZHANG Xin;TANG Liang;LEI Yangkun;ZHOU Xiaogui(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;CISDI Engineering Co.,Ltd.,Chongqing 400013,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学省部共建山区桥梁及隧道工程国家重点实验室,重庆400074 [3]中冶赛迪工程技术股份有限公司,重庆400013

出　　处：《实验室研究与探索》2020年第8期34-38,93,共6页Research and Exploration In Laboratory

基　　金：国家自然科学青年基金项目(51708068);国家自然科学基金项目(51778094);重庆交通大学研究生教育创新基金项目(2019S0141)。

摘　　要：提出了一种基于挠度影响线奇异信号的损伤识别方法,利用静力作用下结构挠度影响线与刚度的关系,结合Hankel矩阵与奇异值分解的信号处理方法,建立了以各截面影响线奇异值为识别因子的损伤识别模型。编写了以Matlab为主控程序的损伤识别算法,同时完成了对一片装配式钢桁-砼组合梁进行多种损伤工况下的试验。结果表明:利用影响线奇异值作为损伤定性指标,结合其斜率变化率最大峰值位置与数值可有效识别组合梁损伤位置与程度。相比其他方法,该方法的损伤位置识别准确度高且抗噪性能强,损伤识别结果较为理想。A damage identification method based on the singular signal of influence line of deflection was proposed.Using the relationship between influence line of deflection and stiffness of the structure under static force,and combining the signal processing methods of Hankel matrix and singular value decomposition( SVD),the paper established a damage identification model with the singular value of the influence line of each section as the identification factor,compiled a damage identification algorithm with Matlab as the main control program,and completed an experimental study on a piece of assembled steel truss-concrete composite beam under various damage conditions. The results show that using the singular value of the influence line as a qualitative indicator of damage,combined with the maximum peak position and value of its slope change rate,we can effectively identify the damage location and degree of the composite beam. Compared with the damage identification results of other methods,this method has high accuracy in identifying the damage location and strong anti-noise performance,the results of damage identification are more ideal.

关 键 词：钢桁-砼组合梁 挠度影响线 奇异信号 损伤识别 

分 类 号：TU317[建筑科学—结构工程]