摘要
为了实现仅采用损伤状态信息对等截面连续梁进行损伤识别,通过推导三跨不等跨连续梁在移动荷载作用下的支座反力影响线,发现支座反力影响线求曲率并作差分后的曲线在损伤位置会发生突变,基于该现象提出了一种损伤定位方法,进一步建立了损伤程度计算方法,可对损伤程度进行较精确的定量。通过一三跨连续梁和一四跨连续梁工程实例的仿真分析,证明了支座反力影响线曲率差分指标损伤定位和相应的损伤程度定量方法对等截面连续梁损伤识别具有可行性。
In order to identify the damage of a continuous beam of uniform cross-section only by using only the damage state information, the support reaction influence line(SRIL) formula of a three-span unequal span continuous beam under a moving load was deduced.It was found that the curvature difference curve of SRIL would change suddenly at the damage position.Based on this phenomenon, a damage location method was proposed, and a calculation method of damage degree was further established, which can accurately quantify the damage degree.Through the simulation analysis of a three span continuous beam and a four span continuous beam in real engineering examples, it is proved that the damage location and quantitative method of SRIL curvature difference index is valid for damage identification of uniform cross-section continuous beam.
作者
唐盛华
张佳奇
刘宇翔
成鹏
TANG Sheng-hua;ZHANG Jia-qi;LIU Yu-xiang;CHENG Peng(Key Laboratory of Dynamics and Reliability of Structures,College of Hunan Province,College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China)
出处
《计算力学学报》
CAS
CSCD
北大核心
2022年第4期427-434,共8页
Chinese Journal of Computational Mechanics
基金
国家自然科学基金(51508488)
湖南省自然科学基金(2019JJ50605)
湖南省教育厅资助科研项目(20K126)
湖湘高层次人才聚集工程创新团队(2019RS1059)
工程结构动力学与可靠性分析湖南省高等学校重点实验室(湘潭大学)开放课题(KLDRES002)资助项目。
关键词
等截面连续梁
支座反力
影响线
曲率差分
损伤识别
损伤程度定量
uniform section continuous beam
support reaction
influence line
curvature difference
damage identification
quantification of damage degree
