分布式光纤传感测试系统(BOTDA)用于H型钢梁变形监测的实验研究  

Experimental Study of H Steel Beam Deformation Monitoring Based on BOTDA

作　　者：郝英奇[1] 丁勇[2] 何宁[2] 

机构地区：[1]安徽建筑工业学院土木工程学院,安徽合肥230022 [2]南京水利科学研究院,江苏南京210029

出　　处：《实验力学》2011年第4期447-456,共10页Journal of Experimental Mechanics

基　　金：安徽建筑工业学院2008年教学研究项目(2008jx02)

摘　　要：介绍了分布式光纤传感测试系统(BOTDA)的应变测量原理,并应用BOTDA技术对H型钢梁加载后的应变分布进行了测量。试验表明,BOTDA的应变测量结果与电阻应变片的测量结果及理论值具有良好的一致性。光纤测量的数据是连续的,因而更加适用于那些需要测试连续变形的结构。由BOTDA的实测应变分布推算出的H型钢梁的弯矩和挠度,与理论分析结果高度吻合。作为先进的监测技术手段,分布式光纤传感测试系统应用于SMW工法桩施工监测是完全可行的。Principle of strain measurement based on Brillouin optical time domain analyzer（BOTDA）is introduced and the strain distribution of a loaded H steel beam was measured by using BOTDA. Experimental results show that the strain measured by BOTDA is in good agreement with theoretical value and that measured by resistance strain gauge. Optical measurement data is continuous and therefore is more suitable for those structures that need to test their continuous deformation. The calculated bending moment and the deflection of tested beam based on the strain distribution measured by BOTDA are also in good agreement with theoretical analysis results. So, as an advanced distributed optical fiber sensing technology, BOTDA is accurate and feasible to be used in the construction monitoring of soil mixing wall technology（SMW）.

关 键 词：分布式光纤传感测试系统(BOTDA) 地基连续墙(SMW)工法 H型钢梁 施工监测 

分 类 号：TU91[建筑科学—建筑理论]