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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 is of great practical significance to establish a set of health monitoring system for the major engineering structures. Damage identification is one of the core technologies of structural health diagnosis. Although a variety of damage identification methods have been developed, accurately measuring the structure response information is the precondition of the damage identification method. Due to the unpredictability of structural damage caused by the complexity of structural loads, the accuracy and quantity of the strain gauges are not desirable for engineering applications. A GFRP-FBG strain sensor with a quasi-distributed long gauge distance based on fiberglass-reinforced composite materials was used to verify its performance by combining with its application to damage identification in simply supported beams. The experimental results show that using the GFRP-FBG strain gauge sensor can effectively predict the damage, locate the damage and judge the damage degree of the bending stiffness.