论梁结构损伤的诊断方法

Study on Damage Detection for Beam Structures

梁是工程结构的基本单元,其受载后的裂纹损伤问题是经常导致事故的原因,对其进行损伤程度的诊断和预测,是保证工程结构安全的前提。该文论述了目前梁结构损伤识别的主要方法,即基于振动的损伤识别、小波分析法、神经网络的损伤识别方法等,分析了各种方法的优缺点,详细介绍了一种改进残余力向量法,即结合残余力向量法和灵敏度分析进行结构损伤识别,应用该方法对矩形等截面悬臂梁的损伤识别进行诊断,并进行了数值模拟。结果表明,改进的残余力向量法用于梁结构的损伤识别,不仅可以诊断出损伤的位置,还可以定量地诊断出损伤的程度,与数值模拟结果吻合。改进的残余力向量法在梁结构的损伤诊断方面具有较高的诊断精度。

The damage detection for beam structures is a premise to protect the safety of engineering structures.Various methods for damage detection of beam structures at present are discussed here.At the same time, the advantages and disadvantages of these methods are reviewed,the development trends in structural damage detection are proposed and analyzed,and an improved residual force vector method is introduced,that is,the residual force vector method combined with the sensitivity analysis is used to detect the structural damage.This method is used to detect the damages of a cantilever beam with rectangular cross-section,and a numerical simulation model is built to verify the efficiency and accuracy of this method.