摘要
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 damage in a steel truss model bridge is simulated by changing its element stiffness. The dynamic behaviors of the model bridge are analyzed with FEM dynamic structural analysis program before and after the model bridge is damaged. It is found that the changes in the mode of vibration are sensitive to the damage degree of elements, and there exists a corresponding relationship between them. A new method for weighting the changes in modes during the structural damage is proposed, in which the modes of structural vibration are chosen as weight coefficients. Element damages can be oriented effectively with this method.
出处
《西南交通大学学报》
EI
CSCD
北大核心
1999年第2期158-162,共5页
Journal of Southwest Jiaotong University
关键词
模态分析
无损检测
钢桁梁桥
损伤检测
钢桥
modal analysis
dynamic structural analysis
non destructive detection
model bridge
steel truss beam
