BOTDR用于钢筋混凝土T型梁变形监测的试验研究

介绍了布里渊光时域反射计(BOTDR)的分布式光纤应变测量原理,并应用BOTDR技术对钢筋混凝土T型梁加载后的应变分布进行了测量.试验表明,BOTDR的应变测量结果与应变片的测量结果具有很好的一致性,并监测到当荷载加至25 kN时,钢筋混凝土梁出现了裂缝.此外,由BOTDR的实测应变分布还推算出了梁的挠度.这些结果显示出BOTDR作为先进的分布式光纤传感监测技术能够准确地测量出钢筋混凝土结构的应变分布,将其用于钢筋混凝土结构的变形监测和损伤识别是可行的.

Experimental study on the deformation monitoring of reinforced concrete T-beam using BOTDR

The principle of Brillouin optical time domai n reflectometer (BOTDR) is introduced and its application to the strain monitori ng of the strain distribution of the reinforced concrete beam is studied. The ex perimental results show that the strains measured by BOTDR optical fiber sensor are in good agreement with those by strain gauges. By comparing the measured s trains of the steel bar inside the concrete with those attached on the concrete surface at the same level, the damage was detected when the load reached 25 kN. And the deflection of the beam was also calculated with the strain distribution measured by BOTDR. Its concluded that, as an advanced distributed optical fiber sensing technology, BOTDR is good at measuring the strain distribution of reinfo rced concrete structures. It is accurate and feasible to be used in the field of deformation monitoring and damage detection of reinforced concrete structures.