摘要
针对位移模态参数对结构损伤欠敏感 ,应用应变模态试验技术诊断结构损伤位置和程度。根据模型梁试验 ,重点比较研究损伤对位移模态、应变模态影响规律及其灵敏程度。得出应变模态对非节点损伤非常敏感 ,在损伤处附近发生突变 ,应变值分布也有较明显改变 ,尤其是跨中损伤第一阶。
Considering the displacement modal parameters insensitive to damage, strain modal test is applied to diagnose the position and degree of structural damage. The principles of damage effect on displacement and strain modes are studied. Based on the test results of model beam in plaster, the strain modes are very sensitive to non-node damage. Furthermore, the abrupt changes of strain are usually found around damaged areas and the change of its distribution is obvious. Especially the first strain mode is susceptible to the middle span damage, and the third and the second modes are susceptible to the quarter span damage.
出处
《振动与冲击》
EI
CSCD
北大核心
2004年第3期60-63,共4页
Journal of Vibration and Shock
基金
水利部科技创新资助项目 (SCX2 0 0 2 - 1 6)
