基于临近差分曲率差值指标的简支梁损伤识别方法  

Damage detection method of simply supported beams based on difference of nearby difference curvature index

作　　者：王艺霖[1] 赵洪凯 李广宁 WANG Yilin;ZHAO Hongkai;LI Guangning(Key Laboratory of Building Structural Retrofitting and Underground Space Engineering of Ministry of Education,School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)

机构地区：[1]山东建筑大学土木工程学院建筑结构加固改造与地下空间工程教育部重点实验室,山东济南250101

出　　处：《四川建筑科学研究》2022年第1期39-47,共9页Sichuan Building Science

基　　金：长江学者和创新团队发展计划教育部创新团队(IRT13075);山东建筑大学博士科研基金项目(XNBS1205)。

摘　　要：为方便有效地进行简支梁的损伤识别,基于对称集中加载和结构静力位移数据的采集,以梁体的局部抗弯刚度和剪切刚度为损伤识别参数,通过理论推导提出了一个基于中心差分曲率指标的损伤识别新指标——临近差分曲率差值D;(difference of nearby difference curvature, DNDC),并建立了相应的损伤识别方法。结果表明,D;指标方法可通过损伤后简支梁的D;值图形形态来直观形象地展示出损伤位置信息,进而可通过简便的计算得到用局部刚度相对变化量来代表的简支梁损伤程度。In order to perform damage detection of simply supported beams conveniently and effectively, a new damage detection index D;(difference of nearby difference curvature, DNDC) based on the central difference curvature index, which employs the local bending stiffness and shear stiffness of the beam as the damage detection parameters and is based on symmetric concentrated loading and the collection of structural static displacement data, was proposed through theoretical derivation. Corresponding damage detection method was established. The results show that the D;index method can visually display the damage location information through the D;value graph form for the damaged simply supported beams. Then the damage degree of simply supported beams, which is represented by the relative change in local stiffness, can be obtained through simple calculation.

关 键 词：建筑结构 简支梁 损伤识别 集中荷载 差分曲率 

分 类 号：TU31[建筑科学—结构工程]