基于应变模态的结构损伤定位方法

Damage localization of changes based on the strain modes for simply supported beam

针对简支梁的单一位置及其多位置损伤,利用结构有限元分析软件计算得到简支梁的位移模态,再通过应变和位移之间具有一阶导数的关系,对简支梁进行了应变模态分析。结果表明,应变模态对损伤比较敏感而位移模态对损伤不够敏感;当损伤发生在应变模态的节点处时,损伤不易被识别,但是可以结合多阶应变模态进行损伤识别。最后对应变模态法的工程实用性进行了评价。

Strain mode analysis is a damage identification method which is sensitive to damage location and damage degree. It is meaningful for damage detection and health monitoring of the structures. In this paper, displacement mode of a simply for single-position supported beam is calculated by using finite element software, and then strain modes of the beam damage and multi-position damage are carried through strain and displacement respectively. The results ment mode. From the results of the multi-position one-order differential relationship between show that strain mode is more sensitive to damage than displacedamage, damage location would be difficult to i situated in the nodes of the strain mode, but it can be overcomed damage location because the damage is impossibly located on the by combining multi-order strain node of every-order strain mode practicability of the strain modal analysis is evaluated in the end.