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以结构健康监测系统为研究背景,研究了光纤布拉格光栅(FBG)传感器。对FBG的研究起步并成熟于通信领域,而对其在土木工程领域的研究尚处于发展阶段。为了进一步促进FBG传感器的发展,推广其在工程中的应用,通过在混凝土简支梁的底部布置经纤维增强复合塑料(FRP)封装的准分布式FBG传感器和未经封装的准分布式FBG传感器,研究了准分布式FBG传感器对钢筋混凝土构件裂缝出现时的有效感知及定位问题。实验结果表明可实现裂缝的大致定位,经FRP封装的FBG传感器相对于裸光纤光栅,其应变灵敏度有所下降。
Taking the structural health monitoring system as the research background, the fiber Bragg grating (FBG) sensor is studied. The research on FBG has started and matured in the field of communications, while its research in the field of civil engineering is still in its development stage. In order to further promote the development of FBG sensor and promote its application in engineering, by arranging the quasi-distributed FBG sensor and the un-packaged quasi-distributed FBG sensor in the bottom of concrete simply supported beam by fiber reinforced composite plastic (FRP) , The quasi-distributed FBG sensor is used to effectively detect and locate the cracks in the reinforced concrete members. Experimental results show that the approximate location of the crack can be achieved. The FBG sensor encapsulated by FRP has a lower sensitivity to strain than the bare FBG.