Stress Monitoring on GFRP Anchors Based on Fiber Bragg Grating Sensors
Stress Monitoring on GFRP Anchors Based on Fiber Bragg Grating Sensors
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DOI：
10.3390/s19071507
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发表时间：
2019-04-01
期刊：
影响因子：
3.9
通讯作者：
Zhou, Xiao-Long
中科院分区：
文献类型：
--
作者：
Kou, Hai-Lei;Li, Wang;Zhou, Xiao-Long
玻璃纤维增强聚合物（GFRP）锚杆因具有抗腐蚀性好、强度重量比高、电磁特性低等优点，在灌浆锚杆中得到了广泛应用，本文通过现场试验研究了光纤布拉格光栅（FBG）传感器监测GFRP锚杆拉拔试验过程中应力分布的可行性。两个GFRP锚完全仪器与FBG传感器，然后安装到地面使用钻孔和灌浆方法。为了测量沿着试验锚杆的应力分布，将7个裸光纤光栅传感器布置在单根光纤中，然后在挤出成型过程中嵌入GFRP锚杆的中间。首先介绍了将裸光纤布拉格光栅传感器嵌入玻璃钢螺栓的过程。然后，讨论了由光纤光栅传感器的测量值计算的轴向力和剪切应力。现场试验结果表明，埋入式光纤光栅技术用于监测GFRP锚杆拉拔过程中的应力状态是可行的。
Glass fiber-reinforced polymer (GFRP) bolts have been widely used in some applications of grouted anchors because of the advantages of better resistance to corrosion, high strength-to-weight ratio, low electromagnetic properties, and so on. This study presents a field test to assess the feasibility of fiber Bragg grating (FBG) sensors in monitoring the stress profile of GFRP anchors during pulling test. Two GFRP anchors were fully instrumented with FBG sensors and then installed into the ground using a drilling and grouting method. To measure the stress profile along test anchors, seven bare FBG sensors were arranged in a single optical fiber and then embedded in the middle of GFRP bolts in the process of extrusion molding. The procedure for embedding bare FBG sensors into GFRP bolts is introduced first. Then, the axial forces and shear stresses that were calculated from the measurements of the FBG sensors are discussed. The field test results indicate that the embedded FBG technology was feasible to monitor the stress state of GFRP anchors during pulling.