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通过改变钢桁梁模型桥单元刚度模拟其结构损伤，利用有限元结构动力分析程序对该模型桥在”损伤”前后进行了结构动力分析。发现振动模态的变化对单元损伤的程度较为敏感且有对应关系。选用结构振动模态作为权数，提出了一种对结构损伤前后的模态变化量进行加权处理的新方法，利用该方法能够对单元损伤实现有效定位。
The structural damage of the model bridge was simulated by changing the element stiffness of the steel truss girder model bridge. The dynamic analysis of the model bridge before and after “damage” was carried out by using the finite element structural dynamic analysis program. It is found that the change of vibration mode is sensitive to the degree of cell damage and has a corresponding relationship. A new method of weighting modal variation before and after structural damage is proposed by using the vibration mode of the structure as the weight. This method can effectively locate the element damage.