基于影响线多源信息融合的悬索桥损伤识别  

Suspension Bridge Damage Identification Based on Multi-source Information Fusion of Influence Lines

作　　者：周宇 王雪忠 赵青 许成超 ZHOU Yu;WANG Xue-zhong;ZHAO Qing;XU Cheng-chao(School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China;BIM Engineering Center of Anhui Province, Hefei 230601, China)

机构地区：[1]安徽建筑大学土木工程学院,合肥230601 [2]安徽省BIM工程中心,合肥230601

出　　处：《科学技术与工程》2022年第1期313-323,共11页Science Technology and Engineering

基　　金：安徽省教育厅省级自然科学研究重点项目(KJ2019A0746);安徽省自然科学基金青年项目(2008085QE247);国家自然科学基金(51868045);安徽建筑大学博士基金(2019QDZ08);安徽省自然科学基金面上项目(1908085ME173)。

摘　　要：为了精确识别悬索桥结构构件的损伤位置及程度,建立悬索桥空间结构有限元模型,通过模拟准静态加载提取并分析结构的位移、应力影响线,并构建了影响线曲率差指标,通过提取结构振型与频率,构建悬索桥结构柔度矩阵,并构造柔度曲率差变化率指标,用于悬索桥结构构件损伤识别。基于Dempster-Shafer证据理论融合影响线与柔度指标,对模型中纵向下弦杆、纵向斜腹杆和吊杆的不同位置与程度损伤进行识别敏感性研究。研究表明,柔度曲率差变化率损伤识别指标比影响线损伤识别指标对悬索桥构件损伤更为敏感,信息融合指标比单一损伤识别指标损伤定位精度更高,且具有较好的噪声鲁棒性。In order to accurately identify the damage location and degree of suspension bridges components,large-span space structure finite element model was established,through the simulation of quasi static loading,the structure of the displacement and stress influence line were extracted and analyzed,the curvature difference index of influence line were established,vibration mode and frequency of structure were obtained,the flexibility matrix of suspension bridge structure were computed,and the flexibility curvature difference rate of change were established to identify the damage of suspension bridge structural members.Combining with the index of influence line and flexibility matrix,the identification sensitivity of different positions and degrees in longitudinal lower chord,longitudinal oblique ventral rod and derrick rod damage were studied based on Dempster-Shafer evidence theory.The results show that the damage identification index of compliance curvature difference rate is more sensitive to the damage of suspension bridge members than that of influence line,and the fusion index has higher accuracy than the single damage identification index,and has better robustness in damage location.

关 键 词：悬索桥 影响线 柔度曲率 信息融合 损伤识别 

分 类 号：TU317.1[建筑科学—结构工程]