摘要
结构裂缝存在将使其局部刚度减少,而局部刚度下降与其固有频率变化紧密相关。应变能对局部损伤较固有频率更为敏感。把结构遭受裂缝损伤的应变能变化量作为损伤指标,提出一种全新的无损裂缝识别方法。并把影响损伤指标因素与假设检验相结合,利用参数假设检验进行识别结果验证。用简支梁模型进行模态试验,将梁损伤前、后的模态参数提取,并用该方法进行裂缝位置及裂缝深度参数的识别。结果表明,该损伤检测方法识别结果精度较高,将其用于裂缝损伤检测是可行的。
Crack damage results in reduction of structural local stiffness, which is closely related to the change of structural natural frequencies. Strain energy is more sensitive to local damage than natural frequencies. Strain energy change is used as damage index and a nondestructive crack detection method is proposed. The damage index is influenced by several factors. The detection results are verified through parameter hypothesis testing. Modal experiments of a simply supported beam with crack damage were perfo...
出处
《工程力学》
EI
CSCD
北大核心
2005年第S1期39-45,共7页
Engineering Mechanics
基金
教育部博士学科点基金项目(2002-2004)
关键词
工程结构
损伤检测
模态应变能
模型试验
裂缝
engineering structure
damage detection
modal strain energy
modal experiment
crack
