重大工程结构在服役期间常遭受各种作用而导致抗力衰减。一旦这些结构失效,将会导致区域功能瘫痪和生态灾难,造成巨大的经济损失和人员伤亡,因此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,而准确地测量结构的响应信息是损伤识别方法有效的前提。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,其准确性和工程量之大对于工程应用来说是不可取的。采用准分布式长标距光纤布拉格光栅(FBG)应变传感器,并结合其在组合梁中损伤识别的应用以验证其性能。试验结果表明,随着标距的增加,准分布式长标距FBG应变传感器损伤识别的效率降低。 Major engineering structures often suffer various effects during service and result in resistance decay. Once these structures fail, they will lead to the paralysis of regional functions and ecological disasters, resulting in huge economic losses and casualties. Therefore, it is of great practical significance to establish a health monitoring system for major project structures. Damage identification is one of the core technologies in structural health diagnosis. Accurate measurement of structure response information is an effective prerequisite for damage identification. Due to the complexity of structural loads, the structural damage is unpredictable. If the strain gage technology is used, its accuracy and large engineering quantities are not suitable for engineering applications. A quasi-distributed long gauge fiber FBG strain sensor is used in combination with its application to damage identification in composite beams to verify its performance. The experimental results show that as the gauge length increases, the damage detection efficiency of the quasi-distributed FBG strain gauge sensor decreases.