基于模态应变能法的梁桥结构损伤识别研究

Study on girder bridge structure damage identification based on modal strain energy method

基于模态应变能法的基本理论,得到适用于梁桥结构损伤识别的指标。以某连续梁桥为例,假定结构存在不同位置和不同程度的损伤,通过ANSYS软件进行有限元分析,得到结构前5阶模态;编制相应Matlab程序对该连续梁桥进行损伤识别。结果表明:基于模态应变能法构建的损伤指标能够准确地对损伤进行定位、定量。

By using the basic theory of the modal strain energy method, an index which is suitable for damage identification in girder bridge structures can be achieved. Taking a continuous beam bridge for example, this paper assumed the structural damages in different locations and varying degrees, obtained the formal five modes of the structure through ANSYS software which is used to perform finite element analysis, developed the corresponding program composition with MATLAB which can calculate the damage index, and identified the structural damage of the continuous beam bridge. The results showed that the damage index based on the modal strain energy method can accurately locate structural damage and quantify the damage level.