智能支座沉降转角差的连续梁单损伤识别方法  

Single-damage identification of continuous beam with intelligent bearing settlement rotation difference

作　　者：唐盛华[1] 周锦睿 康丁丁 TANG Shenghua;ZHOU Jinrui;KANG Dingding(College of Civil Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学土木工程学院,湖南湘潭411105

出　　处：《湘潭大学学报(自然科学版)》2025年第1期168-177,共10页Journal of Xiangtan University(Natural Science Edition)

基　　金：国家自然科学基金(51508488);湖湘高层次人才聚集工程创新团队(2019RS1059);湖南省自然科学基金(2019JJ50605);湖南省教育厅资助科研项目(20K126)。

摘　　要：针对现有连续梁损伤识别方法存在测点数目多、加载复杂、抗噪性差等缺点,提出了一种智能支座沉降转角差的连续梁单损伤识别方法.通过可调节支座高度的智能支座使连续梁的支座逐个发生沉降,获得连续梁损伤前后各支座的转角和反力.然后通过损伤前信息求得抗弯刚度,再计算各支座损伤前后的转角相对差值,确定损伤所在跨数.通过一种沉降作用下损伤跨两侧的转角方程组成方程组,求解出损伤位置和损伤程度.以两跨连续梁为例推导了智能支座沉降转角差的连续梁单损伤识别方法,通过两跨、四跨连续梁验证了该理论的适用性,为连续梁结构损伤识别提供了一种有效的新方法.To overcome the shortcomings of existing continuous beam damage identification methods,such as the number of measurement points,loading complexity and poor noise resistance,a single continuous beam damage identification method with intelligent bearing settlement rotation differences is proposed.The bearings of the continuous beam are set one by one by means of the intelligent bearing,which can adjust the height of the bearing and the rotation and reaction force of each bearing before and after the damage to the continuous beam.Then the bending stiffness is obtained from the pre-damage information,and then the relative differences between the pre-damage and post-damage rotations of each beam is calculated to determine the number of span where the damage is located.The damage location and damage degree are solved by forming a system of equations from the rotation equations on both sides of the damaged span under one kind of settlement action.The single damage identification method for continuous beams with intelligent bearing settlement rotation differences is derived as an example for two-span continuous beams,and the applicability of the theory is verified by two-span and four-span continuous beams,which provides a new and effective method for structural damage identification of continuous beams.

关 键 词：损伤识别 连续梁 智能支座 支座反力 沉降 转角差 

分 类 号：TU311.3[建筑科学—结构工程]