基于光纤光栅传感技术的桥梁结构内部应变监测

利用预先埋入的光纤布拉格光栅(FBGs)实现了实际大型钢筋混凝土工程结构的内部应变监测。在施工期间，将多个FBGs传感器布设到黑龙江呼兰河大桥内部，探索了在建筑施工现场对光纤传感器进行安装、埋入以及传感线路保护的解决方案，并在桥梁施工、桥梁静载实验和桥梁运营阶段监测了呼兰河大桥局部的应变响应。现场实验表明，本系统满足土木工程结构长期健康监测的要求，为建立重要工程设施的结构健康监测系统奠定了基础。

Internal Strain Monitoring of Bridge Structure Based on Fiber Bragg Grating Sensing Technology

Internal strain monitoring in an actual civil engineering structure was implemented with the embedded fiber Bragg grating(FBG) sensors,and several on-site embedded and protected schemes of FBGs sensors were developed.Internal strain response of a pre-stressed RC beam,which is one of box beams of the Chinese Hulan-river bridge,was monitored during the tension process and a static test.The internal strain and temperature of the beam were monitored under traffic loads FBG.The practical results indicate that FBG sensors have the ability to provide continuous and accurate information for the health monitoring of major civil infrastructures.