基于支座反力影响线曲率差分的等截面连续梁损伤识别方法

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。

Damage identification method of continuous beam with uniform cross section based on curvature difference of support reaction influence line

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.