基于全息挠曲线的钢桁-混凝土组合梁损伤识别  

Damage Identification of Steel Truss⁃Concte Composite Girder Based on Holographic Deflection Curve

作　　者：张鑫[1] 周志祥[1,2] 冯麟 邵帅 邓国军[1] ZHANG Xin;ZHOU Zhixiang;FENG Lin;SHAO Shuai;DENG Guojun(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]省部共建山区桥梁及隧道工程国家重点实验室,重庆400074

出　　处：《铁道建筑》2020年第9期31-35,共5页Railway Engineering

摘　　要：开展钢桁-混凝土组合梁无损及多种有损工况下的试验研究,对桥梁损伤进行有效识别与判断。首先利用视觉测量装置获取沿跨度范围内不同荷载作用下组合梁的全息挠曲线;然后通过数据重构得到各截面的挠度影响线,构造Hankel矩阵并进行奇异值分解;最后利用奇异值斜率峰值与斜率变化率突变点识别指标进行多种损伤工况的识别判断。结果表明:基于全息挠曲线的损伤识别方法对不同损伤工况的识别结果与试验加载前人为设计的损伤情况大致相同,该方法能有效识别结构的损伤位置与程度。In order to effectively identify and judge the damage of the bridge,an experimental study on a piece of steel truss-concrete composite girder under non-damage and multi-damage conditions was carried out in turn.Firstly,a visual measurement device was used to obtain the holographic deflection curve of the composite girder under different loads along the span.Secondly,the data was reconstructed to obtain the deflection influence line of each section,then the Hankel matrix was constructed and singular value decomposition was performed.Finally,identifying criterions such as the peak value of the singular value and the catastrophe point of the slope rate were used to identify and judge various damage conditions.The results show that the recognition results of this method for different damage conditions are approximately the same as the damage condition which is artificially designed before test loading,the damage location and degree of the structure can be effectively identified by this method.

关 键 词：钢桁-混凝土组合梁 视觉测量 全息挠曲线 HANKEL矩阵 奇异值分解 损伤识别 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]