基于均布荷载挠度曲率的梁结构损伤识别方法

为运用荷载挠度曲线进行损伤识别，通过力法推导了梁结构在均布荷载作用下的挠度曲率理论公式，提出通过损伤前后的挠度曲率差进行损伤定位，针对多跨连续梁均布荷载下挠度曲率指标存在的损伤识别漏判问题，提出逐跨均布荷载挠度曲率指标以避免其影响，并建立了挠度曲率与损伤程度的理论关系式，可对损伤程度进行较精确的定量描述．通过一简支梁和一三跨连续梁算例，考虑多种损伤工况，分析了指标在不同程度噪声水平下的抗干扰能力，验证了挠度曲率损伤指标应用于实际的可行性．

Damage Identification Method of Beam Structure Based on Uniform Load Deflection Curvature

In order to use the load deflection curve for damage identification, the theoretical formula of deflection curvature of beam structure under uniform load was deduced by the force method. The damage location was identified by the deflection curvature difference before and after damage. In order to solve the problem of missing damage identification for the deflection curvature index of uniformly loaded continuous beam, the span-by-span uniformly loaded deflection curvature index was proposed. The theoretical relationship between the deflection curvature and the damage degree was established, which can quantify the damage degree accurately. Through simulation examples of a simply supported beam and a three-span continuous beam, considering various damage conditions and under different levels of noise, the practical feasibility of the deflection curvature damage index was verified.