基于GFRP OFBG筋的桥梁缆索索力测量技术研究

Study on Cable Force Measurement Based on Smart GFRP OFBG Bars

中文关键词:索力测量  光纤光栅传感器  GFRP OFBG筋  钢绞线  平行钢丝拉索  平行钢绞线拉索

英文关键词:cable force measurement  Optical Fiber Bragg grating (OFBG)  GFRP OFBG bar  steel strand  parallel wire cable  parallel strand cable

中文摘要:

      基于内嵌光纤Bragg光栅传感器的光纤光栅 玻璃纤维增强塑料复合筋（GFRP OFBG筋），研究了GFRP OFBG筋自身的应变和温度传感特性，研究结果表明,GFRP OFBG智能筋具有优异的线性传感性能，筋中光栅测量的应变极限达12 000 με以上，波长变化达14 nm；对于用GFRP OFBG筋替换普通钢绞线的中丝而得到的GFRP OFBG智能钢绞线，进行了应变传感、温度敏感和钢绞线松弛试验，试验结果表明,GFRP OFBG智能钢绞线具有优异的线性传感性能和较低的应力松弛率，并可实现钢绞线受载全过

英文摘要:

      Combining the strength properties of Glass Fiber Reinforced Polymer (GFRP) with the sensing properties of Optical Fiber Brag Grating (OFBG), a new kind of smart GFRP OFBG composite bars have been developed. The stress and temperature sensing properties of GFRP OFBG bars are studied. The result shows that GFRP OFBG bars are perfect sensors and the maximum tensile strain is up to 12 000 με. The maximum range of wavelength shift for OFBG is up to 14 nm. The smart strand is made by GFRP OFBG bar replacing the middle wire of normal strand. The sensing property test and stress relaxation test are carried out. The experimental results show that smart GFRP OFBG strand has a good linear sensor performance and a low relaxation rate. OFBG sensor built in GFRP bar can monitor the whole load process. The maximum monitoring strain of OFBG is up to 11 568.2 με and the maximum range of wavelength shift for OFBG is up to 15.966 nm. The smart parallel wire cables and strand cables can be obtained by adding smart GFRP OFBG bars or smart strands. The load sensing property is investigated. The experimental results show that the ultimate sensor range of GFRP OFBG bars is up to 70% ultimate lengths of stay cable. Engineering application of smart cables shows that the load effect of stay cable can be obtained easily by GFRP OFBG bar sensor.