【摘要】 为掌握玻璃纤维增强塑料(GFRP)锚杆的变形特性,采用布里渊光时域反射测量计(BOTDR)技术,对沿光纤的轴向应变进行分布式监测,得到试验锚杆通体的轴向应变.阐述了BOTDR技术的工作原理以及对GFRP锚杆的张拉应变监测试验过程.试验结果表明:光纤能与锚杆同步变形,BOTDR技术对锚杆体轴向应变的监测效果好,可以替代传统的锚杆应变计.更多还原

【Abstract】 Glass fiber reinforced plastic is a complex material and can be used to produce GFRP rebar bar to reinforce slope,but its strain characteristic is not clear. The Brilliouin optical time domain reflectometer is a newly developed innovative measuring technique,which utilizes Brilliouin spectroscopy and optical time domain reflectometer to measure strain generated in optical fibers distributed in the longitudinal direction.Straightforward the optic fiber is stuck to surface of the rebar bar.BOTDR technique is used to measure train generated in optical fibers distributed in the longitudinal direction. Through this method to get the rebar bar longitudiual direction strain.The measuring principles of BOTDR technology and experimental procedure are described.The result shows that the fiber and GFRP anchor bar can strain in-phase,and the monitoring effect is good.So BOTDR technology can be applied in strain monitoring of GFRP anchor bar.更多还原