混凝土梁结构损伤识别理论与试验研究

Theory and Experimental Research on Concrete Beam Structure Damage Idenification

基于模态应变能理论,得到能用于混凝土梁结构损伤的识别指标。假定结构存在不同位置和不同程度的损伤,运用数值计算及试验所测数值结果,得到梁损伤前后的前五阶模态,然后再运用计算机软件编程计算结构的各单元的损伤指标。数值模拟及试验结果表明,损伤指标在损伤单元处的数值是最大的。因此,采用本文提出的损伤指标,对混凝土梁结构进行损伤定位识别是可行的。

Based on the theory of modal strain energy, a damage index was deduced to identify the concrete beam structure damage. In this paper, supposing there were some different damage positions and extents in structure, the numerical calculation and testing results were applied to obtain the first five modes of beam structure before and after damage, and then every element damage index in structure was calculated by applying the software program. The numerical and experimental results show that the damage index value in the damage element is the biggest. It is concluded that the proposed damage index is feasible for the damage localization of concrete beam structures.