基于加速度模态曲率的桥梁结构损伤评估方法  

Bridge Structural Damage Assessment Method Based on Acceleration Modal Curvature

作　　者：陈红墺 曹忠辉 杜文康 何锦涛 雷冬[1,3] 朱飞鹏[1] 白鹏翔[1] CHEN Hongao;CAO Zhonghui;DU Wenkang;HE Jintao;LEI Dong;ZHU Feipeng;BAI Pengxiang(College of Mechanics and Engineering Science,Hohai University,Nanjing 210000,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Suzhou Research Institute of Hohai University,Suzhou 215000,China;Hunan Water Transport Construction Investment Group Co.Ltd.,Changsha 410011,China)

机构地区：[1]河海大学力学与工程科学学院,南京210000 [2]河海大学土木与交通学院,南京210098 [3]河海大学苏州研究院,苏州215000 [4]湖南省水运建设投资集团有限公司,长沙410011

出　　处：《河南科学》2024年第10期1467-1476,共10页Henan Science

基　　金：国家自然科学基金(12172120);苏州市科技发展计划(SYC2022080);江苏省研究生科研与实践创新计划项目(KYCX23_0660);湖南省交通科技项目(202316);沅水洪江至辰溪航道建设工程科技创新项目(HA-2024-7)。

摘　　要：基于加速度振动信号和弹性薄板理论,提出了一种利用加速度模态曲率定位桥梁结构损伤的方法,并根据模态曲率面积方差比提出用于量化桥梁结构损伤的损伤指数.结果表明,通过简支梁固有频率和一阶加速度模态振型的长期变化趋势能够识别结构损伤;在没有无损工况作为参考时,通过简支梁沿主梁方向的总应变和一阶加速度模态曲率能够准确定位到简支梁的损伤位置,二者的损伤定位结果互相印证,但一阶加速度模态曲率对低程度损伤的敏感性比应变更高;损伤位置处的一阶加速度模态曲率突变会随着结构损伤程度的增加变得越来越明显;拟合出损伤指数与刚度损伤程度的关系曲线,利用两者之间的关系曲线可以对简支梁损伤程度进行量化,且经过验证发现该方法的计算精度较高.Based on acceleration vibration signal and elastic thin plate theory,a method is proposed for locating bridge structural damage by acceleration mode curvature,and a damage index is proposed to quantify bridge structural damage according to the area variance ratio of mode curvature.The results show that the structural damage can be identified by the long-term change trend of natural frequency and first-order acceleration mode shape of the simply supported beam.The damage location of the simply-supported beam can be accurately located by the total strain along the main beam direction and first-order acceleration mode curvature without the comparison of lossless condition.The results of damage localization are consistent between the two methods,but the first-order acceleration mode curvature is more sensitive to low-degree damage than the strain.The mutation of the first-order acceleration mode curvature at the damage site becomes more and more obvious with the increase of the damage degree.The relationship curve between the damage index and the stiffness damage degree is fitted,which can be used to quantify the damage degree of the simply-supported beam,and the calculation accuracy of this method is proved to be high.

关 键 词：桥梁工程 简支梁 主梁应变 加速度模态曲率 损伤评估 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]