基于动响应数据特征的桥梁结构损伤识别

Bridge structural damage identification based on dynamic response data feature

介绍了本征正交分解(Proper Orthogonal Decomposition,POD)的基本原理,探讨了POD在桥梁结构损伤识别中的应用。提出了基于动响应数据特征的桥梁结构损伤识别方法,该识别方法基于POD技术对桥梁结构在不同位置、不同时刻收集到的位移快照矩阵(Snapshot Matrix)进行本征正交分解,得到结构的本征正交模态(POMs),进而构造出损伤指标来识别结构的损伤位置及程度,实现了对桥梁结构损伤的多工况识别。并以保定黄花沟桥为例,通过数值模拟试验,验证了该方法的有效性,结果表明POD能够从空心板桥结构的振动响应数据中提取出结构的本质特征,并且提取过程简单、快捷,可为桥梁结构提供一种有效的损伤识别方法。

The basic principle of Proper Orthogonal Decomposition(POD)was introduced,and the application of POD in bridge structural damage identification was discussed.A damage identification method for bridge structure based on dynamic response data features was proposed.The identification method is based on POD technology to perform Proper Orthogonal Decomposition of the displacement Snapshot Matrix(Snapshot Matrix)collected at different positions and different times of the bridge structure to obtain the Proper Orthogonal Modes(POMs)of the structure,and then construct the damage index which can identify the damage location and severity of the structure,and realize the multi⁃condition identification of bridge structure damage.Taking the Huanghuagou Bridge in Baoding as an example,the effectiveness of the method was verified through numerical simulation experiments.The results show that POD can extract the essential characteristics of the structure from the vibration response data of the hollow slab bridge structure,and the extract process is simple and fast,which can provide an effective damage identification method for bridge structure.