利用动静力测量数据的桥梁结构损伤识别

Damage Detection for Bridge Structures Based on Dynamic and Static Measurements

提出了一种基于模型修正理论的结构损伤检测的方法．首先给出一种利用结构振动模态数据修正结构刚度的于结构算法，然后将这一方法推广为同时利用振动模态数据和静力位移量测值的损伤识别方法；运用缩阶的理论分析模型解决实测自由度不足的矛盾．以一悬臂梁的损伤仿真试验，验证这一方法的有效性．

In this paper, an efficient method for structural damage detection is developed based on model refinement theory. First, a submatrix approach using modal test data to stiffhess matrix correction is described. Then a damage assessment methed that has its basis in both dynamic and static measurements is derived from the submatrix approach.Loss of shiffness, both its location and extent, is identified by detemining the reduction factors corresponding to the submatrices being examined. Order - reduced analytical model is utilized to match experimental model, the dimension of which is insufficient due to practical testing limitations. Finally, a computer simulated case is studied on a cantilever beam to illustrate the damage evaluating capability and to investigate the feasibility of the proposed technique for bridge structures' health monitoring.