摘要
在结构健康监测中,为了判断混凝土结构是否开裂,开发了基于光纤布拉格光栅(fiber bragg grating,简称FBG)的应变传感器。在钢筋混凝土框架-剪力墙结构模型的振动台破坏试验中应用该传感器进行监测。试验表明,应用FBG应变传感器可直观且准确地监测到结构局部钢筋的应变变化。据此推算出构件表面的混凝土拉应变,在与混凝土的极限拉应变比较后,可较准确地判断结构是否开裂。
A kind of strain sensor using fiber Bragg grating (FBG) was developed to study the problem of determining whether concrete structures crack or not.The characteristics of this kind of strain sensors are studied.This kind of strain sensors are used to monitor reinforced concrete frame-shear wall structure models in destructive experiments on a shaking table.It turns out that it can be determined whether the structure cracks or not according to the monitored data and the results are in good agreement with what are observed at the testing site.Therefore,it is concluded that the developed FBG strain sensor is able to directly and accurately monitor the local strain variation on reinforcing steel bar in the structure and then the tension strain in concrete on member surface can be obtained by derivation; it can be accurately determined whether the structure cracks or not by comparing the obtained tension strain with the ultimate tension strain of concrete.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2010年第5期496-499,共4页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(编号:10902073)
中国博士后基金特别资助项目(编号:200801388)
辽宁省自然科学基金资助项目(编号:20072004)
建设部科技项目(编号:2008-K4-26)
沈阳市科技局科技项目(编号:1081271-9-00)
关键词
光纤光栅
传感器
裂缝
结构
监测
fiber Bragg grating sensor crack structure monitor
