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。

Based on the study background for structural health monitoring (SHM), fiber Bragg grating (FBG) sensor is researched. The study on FBG starts and matures in the field of telecommunication, and the corresponding study in the field of civil engineering is in a development stage even. To improve its further developments and promote its application in engineering, two kinds of quasi-distributed FBG sensors placements are considered, one for the fiber reinforced plastics (FRP) package and the other for without package. The sensors are pasted on the bottom of the beam. Study on the detecting effectiveness and damaqe locating of the quasi-distributed FBG sensor when the reinforced concrete beam specimen cracks appear are carried out. The experimental results show that the crack can be roughly located, and the strain sensitivity of the FBG sensor with FRP package declines relative to the rare FBG sensor.