【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、四分之一跨损伤第三和第二阶更多还原

【Abstract】 Strain modal test is applied to diagnosing the position and degree of structural damage,in consideration of the displacement modal parameters being insensitive to damage.The principles of damage effect on displacement and strain modes ane studied.Based on the test results of model beam in plaster,it is concluded that 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,while the third and the second modes are susceptible to the quarter span damage.更多还原