基于模态应变能法识别混凝土梁结构损伤的数值及试验研究

Numerical and experimental research on concrete beam structure damage identification based on modal strain energy

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5阶模态,然后再运用Mathematics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.

Based on the theory of modal strain energy, a damage index is deduced to identify the concrete beam structure damage. In this paper, supposing there lie some different extents in structure, the numerical calculation and testing results are applied damage positions and to obtain the first five modes of beam structure before and after damage, and then every element damage index in structure is calculated through applying the Software Mathematics program. The numerical and experimental results show that the damage index value in the damage element is the biggest.