摘要
本文面向实际桥梁结构存在的非理想支承与初始截面抗弯的不确定性,提出考虑弹性竖向支承与转动支承的弹性约束梁模型,并推导该模型任意截面应变影响线解析表达式,揭示了弹性约束刚度与局部损伤参数与应变影响线的解析关系,提出基于应变影响线曲率的梁式子结构损伤识别方法,并对该方法适用于超静定梁结构损伤识别给与解析证明.通过刚架拱桥的拱片与钢桁系杆拱桥算例验证所提方法有效性与抗噪性,结果表明本文方法识别损伤的敏感程度同测点到损伤处的距离成反比,建议实际工程中可增加应变测点来提高损伤识别的敏感性.
With the non-ideal support and the uncertainty of the initial section bending resistance of the actual bridge structure consideration, an elastically edge-restrained beam model considering elastic vertical support and rotational support was proposed in this paper.The analytical expressions for the influence of any cross-section strain on the main beam were derived which revealed the relationship between elastic edge-restraint stiffness and local damage parameters and strain influence lines.A beam-based substructure damage identification method based on curvature of strain influence lines was proposed which proved that this method is suitable for damage identification of statically indeterminate beam structures.The validity of the proposed method and the anti-noise performance were verified by examples of rigid frame arches and steel truss tied arch bridge.The results showed that the sensitivity of the method to identify the damage was inversely proportional to the distance from the measuring point to the damage.It was suggested that the strain measuring points should be increased in the actual project in order to improving the sensitivity of the damage identification.
作者
周宇
狄生奎
李喜梅
李万润
原子
ZHOU Yu;DI Shengkui;LI Ximei;LI Wanrun;YUAN Zi(College of Civil Engineering,Anhui Jianzhu University,Hefei 230601,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;College of Civil Engineering,Huaqiao University,Xiamen 361021,China)
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2021年第4期901-914,共14页
Journal of Basic Science and Engineering
基金
安徽省高校省级自然科学研究重点项目(KJ2019A0746)
国家自然科学基金项目(51868045,51908266)
安徽省自然科学基金青年项目(2008085QE247)
安徽建筑大学博士启动基金(2019QDZ08)。
关键词
弹性约束
不确定性
梁式子结构
应变影响线
损伤诊断
Elastically edge-restraint
uncertainty
beam-based substructure
strain influence line
damage diagnosis
