光纤Bragg光栅监测混凝土小立柱表面应变的试验研究

Experimental Study on Surface Strain of Small Concrete Columns Monitored by Fiber Bragg Grating

采用一种新型的表面式FBG应变计和裸光栅监测混凝土小立柱在受压过程中的表面应变,研究了混凝土小立柱受压过程中的应变特征。试验过程中将2小立柱分别置于室内和室外,分析FBG在室外雨天情况下的传感特性与在室内情况下的差异,同时与常规应变片监测方法进行比较,实现对混凝土结构表面应变的监测,并对其工作状态进行了评价。试验结果与理论值、常规应变片监测结果一致,为其应用于实际工程提供了可行性依据。

We used a new type of surface FBG strain gauge and the bare grating to monitor the strain of small concrete columns during the compression process. Two small columns have been respectively arranged indoor and outdoor during the experiment. We will analyze the difference of sensing characteristic between the situation of FBG indoors and rainy outdoors.Compared with the conventional strain gauge monitoring method,the strain of the surface concrete have been monitored, and the working state was also evaluated. The test results and the theoretical value and the routine monitoring results of strain gauge are all consistent. So that a feasible basis will be provide for the practical engineering.