光纤传感技术在道路结构荷载监测中的应用

Application of Optical Fiber Sensing Technology in Road Structure Load Monitoring

光纤传感技术在结构荷载监测中的应用越来越广泛,为厘清光纤在监测沥青混凝土路面荷载响应时的信号规律,文章采用室内试验的方法,依托小型加速加载试验,对埋设裸光纤和PVC光纤的车辙板试件进行加载,获取荷载作用下的光纤信号,提出信号强度和信号敏感度两个特征值,并对其规律特征进行分析。结果表明,光纤信号强度在标准荷载的长期作用下较为稳定,耐久性能较好。同时,随着荷载作用次数不断增加,裸光纤的敏感度比PVC光纤的信号敏感度强,其对荷载的分辨能力较PVC光纤强。

The application of optical fiber sensing technology in structural load monitoring is more and more extensive.In order to clarify the signal law of optical fiber in monitoring the load response of asphalt concrete pavement,uses indoor test methods,relying on small accelerated loading tests,to load the rut plate specimens embedded with bare optical fiber and PVC optical fiber,obtain the optical fiber signal under the load,and propose two characteristic values of signal strength and signal sensitivity,and analyze its regular characteristics.The results show that the optical fiber signal strength is relatively stable under the long-term action of standard load,and the durability is good.At the same time,with the increasing number of load applications,the sensitivity of bare optical fiber is stronger than that of PVC optical fiber,and its load resolution is stronger than that of PVC optical fiber.