为重大工程结构建立一套健康监测系统具有重要的现实意义。损伤识别是结构健康诊断的核心技术之一，虽然已发展出多种损伤识别方法，但准确地测量结构的响应信息是损伤识别方法有效性的前提。由于结构荷载的复杂性致使结构损伤具有不可预见性，如果采用电阻应变片技术，其准确性和工程量对于工程应用来说是不可取的。采用准分布式长标距基于玻璃纤维增强复合材料封装的光纤布拉格光栅（GFRP-FBG）应变传感器，并结合其在简支钢梁中损伤识别的应用以验证其性能。实验结果表明，利用准分布式长标距GFRP-FBG应变传感器可有效地预警损伤、定位损伤和判断抗弯刚度损伤程度。

It has important and practical significance to establish a complete set of health monitoring system for massive project structure. Damage detection is one of the core technologies for structural health identification. Although a variety of damage identification methods have been developed, accurately measuring the response of the structural information is the premise of the effectiveness of damage identification. Damage inside the structure cannot be predicted, so it is not advisable for health monitoring by means of strain gauges. We use quasi-distributed long-gage optical fiber Bragg grating based on glass-fiber reinforced composite material package (GFRP-FBG) and combine it with the damage detection application in simply supported steel beam to verify the performance of the quasi-distributed long-gage GFRP-FBG strain sensor. The test results show that using quasi-distributed long-gage GFRP-FBG strain sensor can effectively perform damage fore-warning and damage location, and estimate the damage degree of bending stiffness.