关键词: 道路工程, 模态参数, 物理参数, 随机误差, 灵敏度矩阵, 桥梁损伤识别

Abstract: A method to identify the damage of the bridge structure using the sensitivity matrix of the modal parameters with respect to the physical parameters of the structure on the basis of the matrix pertubation theory in the vibration analysis. This method is convenient in formation of the sensitivity matrix of the structure because of no need of the partial derivative calculations. To evaluate the stability of the proposed method, the statistical properties of the physical parameters of the bridge structure were analyzed under the model parameters with random errors. The validity, the practicability and the stability of the method were demonstrated by a simply supported reinforced concrete bridge as an example.

Key words: road engineering, modal parameter, physical parameter, random error, sensitivity analysis, damage identification of bridge