基于模态平均曲率差归一化的桥梁结构损伤识别  

Damage identification of bridge structure based on normalization of modal average curvature difference

作　　者：肖冰 祝可为 XIAO Bing;ZHU Kewei(School of Civil Engineering,Fujian Chuanzheng Communications College,Fuzhou,350007,China)

机构地区：[1]福建船政交通职业学院土木工程学院,福建福州350007

出　　处：《华北科技学院学报》2022年第5期93-101,共9页Journal of North China Institute of Science and Technology

基　　金：福建省交通运输科技项目(202031)。

摘　　要：为研究以模态平均曲率差归一化为基础的桥梁损伤识别,推导运用位移波形曲率差归一化构建的指标与桥梁损伤识别的关系,以福建某悬索桥为算例,考虑在单损伤和双损伤邓不同程度的损伤工况下,添加1%和5%的实测噪声频率进行损伤识别分析。结果表明,基于归一化模态平均曲率差法能有效定位出自锚式悬索桥的损伤,具有良好的鲁棒性和精确性,也为其他类似桥梁的结构安全损伤识别提供借鉴。Aiming at the proposed the hypotheses,the damage identification of bridge was studied by normalizing the difference of modal average curvature.The relationship between indexes and damage identification was theoretically deduced based on the normalization of curvature difference of displacement waveform.Taking the suspension bridge in Fujian as a numerical example and considering four damage conditions under single damage and double damages,add 1%and 5%measured noise frequencies to identify the damage,respectively.The results showed that damage of self-anchored suspension bridge can be effectively located by normalizing the difference of modal average curvature,the identification had excellent robustness and accuracy.It also provided reference for structural safety identification for other similar bridges.

关 键 词：平均曲率差 归一化 损伤识别 鲁棒性 

分 类 号：U441[建筑科学—桥梁与隧道工程]