基于数据融合的连续梁桥损伤识别研究  

Study on Continuous Girder Bridge Damage Identification Based on Data Fusion

作　　者：曹悦[1] 包龙生[1] 张筱薇[1] 孟宪彪 CAO Yue;BAO Long-sheng;ZHANG Xiao-wei;MENG Xian-biao(Shenyang Architecture University,Shenyang Liaoning 110168,China;China Railway 19th Bureau Group Rail Transit Engineering Co.,Ltd.,Beijing 101300,China)

机构地区：[1]沈阳建筑大学,辽宁沈阳110168 [2]中铁十九局集团轨道交通工程有限公司,北京101300

出　　处：《公路交通科技》2023年第11期115-122,共8页Journal of Highway and Transportation Research and Development

基　　金：“十三五”重点研发计划重点专项基金项目(2018YFC0809600,2018YFC0809606);沈阳市科技计划基金项目(23-407-3-19)。

摘　　要：针对桥梁损伤识别过程中采用单一损伤指纹进行识别而导致识别结果不精准、损伤误判的情况,提出了将数据融合理论D-S证据理论引入到损伤识别理论中来。在基础损伤指标位移模态与曲率模态的基础上,采用二次融合的识别方法,将位移模态差和曲率模态差分别自我融合后再将各自融合结果进行二次融合。首先,建立了三跨连续梁有限元模型,通过模态分析获取原始损伤指纹并构造损伤指标。应用Matlab编写了基于D-S证据理论准则的融合损伤识别程序,先计算位移模态差及曲率模态差,再对位移模态差及曲率模态差进行各自自我融合,通过单一损伤工况及两处损伤工况的模态数据分析了采用单一指纹自我融合的识别效果。然后,应用程序对两个指标自我融合后的指标进行再次融合,通过单一损伤及两处损伤工况的模态数据分析了最终损伤识别结果。最后,通过对三跨连续梁损伤单元处预设5%和10%程度的早期损伤对该方法进行了验证。结果表明:最终识别结果显示无论单一损伤或两处损伤,即使损伤微小,该数据融合方法依然能对损伤位置进行精准识别且识别效果较好,识别结果中显示未发生损伤处的波形均相对平缓不会发生损伤误判。该方法有效改善了单一损伤指标进行损伤识别的局限性,具有一定的可行性。The data fusion theory,D-S evidence theory,is introduced into damage identification theory,due to the process of bridge damage identification,a single damage fingerprint is used to identify the bridge,that results in inaccurate identification result and incorrect damage identification.Based on the basic damage indicator displacement modal and curvature modal,the displacement modal difference and curvature modal difference are fused separately,and then the fusion results are fused twice by adopting the recognition method of secondary fusion.First,the finite element model of three-span continuous beam is established,and the original damage fingerprint is obtained by modal analysis and the damage indicator is constructed.A fusion damage identification program based on D-S evidence theory is compiled by MATLAB.The displacement modal difference and curvature modal difference are calculated first,then the displacement modal difference and curvature modal difference are fused respectively,based on the modal data of single damage condition and two damage conditions,the recognition effect of single fingerprint self-fusion is analyzed.Then,the two self-fused indicators are fused again,and the final damage identification results are analyzed by the modal data of single damage and two damage conditions.Finally,the method is verified by preset 5%and 10%early damage at damage element of three-span continuous beam.The result shows that the data fusion method can accurately identify the location of the single damage or two damage,even if the damage is small,in the recognition results,the waveforms of the non-damaged areas are relatively smooth and can not be misjudged.The method can effectively improve the limitation of single damage indicator in damage identification and has certain feasibility.

关 键 词：桥梁工程 损伤识别 数据融合 曲率模态 D-S证据理论 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] TU997[交通运输工程—道路与铁道工程]