曲率模态在检测环境温度下简支梁损伤中的应用

Application of curvature mode in detecting damage of simple beam under ambient temperature

以环境温度影响下的矩形截面简支梁为研究对象,通过有限元模拟得到损伤前后的多阶模态振型,从而计算得到结构曲率模态,进而识别结构损伤状况。结果表明:温度变化对结构振型及曲率没有影响,损伤前后振型的变化可以识别温度变化下结构损伤但是效果不佳,简支梁振型曲率则可以对结构的损伤进行有效的识别、定位,对多损伤工况仍然适用。

Taking the simple beam with rectangular section under the influence of ambient temperature as the research object, the multi-mode vibration modes before and after the damage were obtained through the finite element simulation, and then the structure curvature mode was calculated to identify the structural damage status. The results show that the temperature change has no effect on the vibration mode and curvature of the structure. Changes in mode shape before and after damage can identify the structural damage due to temperature changes but are ineffective. The simple beam mode curvature can effectively identify and locate the structure damage, and is still applicable to multiple damage conditions.