基于刚度矩阵的桥梁损伤识别研究

结构损伤本质上是结构局部刚度和质量的改变,反映在结构动力特性上是模态参数的变化.针对桥梁损伤往往只是局部刚度改变的情况,提出一种基于结构及其子结构的刚度矩阵,利用固有频率和振型确定子结构刚度矩阵的改变程度,以及改变了刚度矩阵的子结构的位置,来判断桥梁损伤的位置及其程度的结构损伤识别方法.从识别结果看,该方法能对桥梁结构的损伤位置及其程度做出准确的识别.,

Researches on Bridge Damage Identification Based on Stiffness Matrices

When a structure is damaged there is often a concomitant localized change in structural stiffness and mass,which may affect the dynamic characteristics of the structure and change the modal parameters,such as the natural frequencies and mode shapes.In view of the fact that the damage of bridge often only results in its changes of stiffness,this paper presents a method based on the stiffness matrices of the bridge structure for bridge damage identification,which takes into account the natural frequencies and mode shapes to the identification and diagnosis of the site and degree of damage.According to the result,the method can accurately identify the site and degree of the bridge damage.