(中铁第四勘察设计院集团有限公司, 武汉 430063)

摘要: 现有 RC 梁结构静力损伤识别方法存在获取信息量少、误差容许能力差等问题,导致其难以准确反映结构损伤位置和损伤程度。 基于此,提出了一种基于静力特性的 RC 梁结构损伤识别方法。 首先根据应变差值理论公式和小波变换理论,基于梁的静力特性建立 RC 梁的损伤定位和损伤程度定量的识别方法。 然后采用有限元软件ABAQUS 建立钢筋混凝土简支梁模型,利用有限元单元刚度下降模拟梁结构损伤,并基于损伤位置的敏感度对方法进行修正。 最后开展了 1 根未损伤梁和 4 根预损伤梁的静力试验,对损伤识别方法进行了验证。 结果表明:损伤指标值在损伤位置处产生峰值,且其值与损伤程度呈正相关。 该损伤识别方法不仅能够准确地识别损伤出现的位置,而且能够得到与实际相符的损伤程度识别结果。

关键词: RC 梁结构; 损伤识别; 静力特性; 小波变换; 有限元分析; 静力试验

中图分类号:TU375. 1 文献标志码:A 文章编号:1002-848X(2022)24-0088-05

DOI:10. 19701 / j. jzjg. 20210436

Research on damage identification method of RC beam structure based on static characteristics

SHEN Lei

(China Railway Siyuan Survey and Design Group Co. , Ltd. , Wuhan 430063, China)

Abstract: The existing static damage identification methods for RC beam structures have problems such as less informationand poor error tolerance, which make it difficult to accurately reflect the location and extent of structural damage. Based onthis, a damage identification method of RC beam structure based on static characteristics was proposed. Firstly, accordingto the strain difference theory formula and wavelet transform theory, based on the static characteristics of the beam, thedamage location and quantitative damage degree identification methods of RC beams were established. Then the reinforcedconcrete simply supported beam model was established by using the finite element software ABAQUS, and the damage ofthe beam structure was simulated by using the stiffness decline of the finite element, and the method was modified based onthe sensitivity of the damage location. Finally, the static tests of 1 undamaged beam and 4 pre-damaged beams were carriedout to verify the damage identification method. The results show that the damage index value has a peak value at the damagelocation, and its value is positively correlated with the damage degree. The damage identification method can not onlyaccurately identify the location of the damage, but also obtain the damage degree identification results consistent with theactual situation.

Keywords:RC beam structure; damage identification; static characteristic; wavelet transform; finite element analysis;static test

∗国家重点研发计划(2016YFC0802205)。

第一作者:沈磊,硕士,高级工程师,一级注册结构工程师,主要从事大跨、高层结构设计工作,Email:316789796@ qq. com。

[引用本文] 沈磊. 基于静力特性的 RC 梁结构损伤识别方法研究[ J]. 建筑结构,2022,52( 24):88-92,125.SHEN Lei. Research on damage identification method of RC beam structure based on static characteristics[ J]. BuildingStructure,2022,52(24):88-92,125.