混凝土内部应变分布式光纤实时检测方法及试验研究
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摘要
布里渊散射光时域分析技术(BOTDA)是1种新型光电监测技术,可对沿光纤轴向的应变、温度进行分布式监测,并具有长距离、分布式、高精度和耐久性等特点,适用于结构的健康监测。系统介绍了基于BOTDA的混凝土内部分布式应变的检测方法,并通过试验研究标定了由气吹再灌浆技术铺设的埋入式传感光纤的工作性能,解决了工程应用中无法将长距离分布式传感光纤埋入混凝土内部的技术难题。试验结果表明,以气吹再灌浆技术铺设的埋入式光纤传感器能有效检测混凝土内部分布式应变,可应用于结构物的全面、长期、稳定、实时的健康监测。
The Brilliouin optical time domain analysis(BOTDA) is a newly developed technique adopted to measure and monitor the strain and temperature generated along optical fibers.The BOTDA has the characteristics of distributed measurement,long distance,high precision and durability,so it is suitable to structural health monitoring.Then a new optical fiber sensor embedded method based on air-blowing and vacuum grouting is introduced.It can lay the long distance distributed optical fiber into the concrete easily in short time.An experiment has been set up to study the validity of the new method,which shows that the embedded optical fiber can measure the concrete strain accurately,and it can realize the comprehensive,long-term,stable and real-time health monitoring to the civil structure.
The Brilliouin optical time domain analysis(BOTDA) is a newly developed technique adopted to measure and monitor the strain and temperature generated along optical fibers.The BOTDA has the characteristics of distributed measurement,long distance,high precision and durability,so it is suitable to structural health monitoring.Then a new optical fiber sensor embedded method based on air-blowing and vacuum grouting is introduced.It can lay the long distance distributed optical fiber into the concrete easily in short time.An experiment has been set up to study the validity of the new method,which shows that the embedded optical fiber can measure the concrete strain accurately,and it can realize the comprehensive,long-term,stable and real-time health monitoring to the civil structure.
引文
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[13]傅翼,金伟良,粟京,等.海底管道中长距离徼管真空灌浆试验研究[J].新型建筑材料.2005,10:14-19FU YI,JIN WEI-LIANG,SUJING,et al.Experi mentalstudy on vacuumgrouting for long distance microtubuleof submarine pipeline[J].Chinese Journal of NewBuilding Materials,2005,10:14-19.
[14]GB50152-92混凝土结构试验方法标准[S].北京:中国建筑工业出版社,1992.
[2]施斌,徐学军,王镝,等.隧道健康诊断BOTDR分布式光纤应变监测技术研究[J].岩石力学与工程学报,2005,24(15):2622-2627.SHI BIN,XU XUE-JUN,WANG DI,et al.Study onBOTDA-based distributed optical fiber strainmeasurement for tunnel health diagnosis[J].ChineseJournal of Rock Mechanics and Engineering,2005,24(15):2622-2627.
[3]葛捷.分布式布里渊光纤传感技术在海堤沉降监测中的应用[J].岩土力学,2009,30(6):1857-1860.GE JIE.Application of BOTDRto monitoring sea dykesubsidence[J].Rock and Soil Mechanics,2009,30(6):1857-1860.
[4]FABIO MATTA,FILIPPO BASTIANINI,NESTOREGALATI.Distributed strain measurement in steelbridge with fiber optic sensors:validation throughdiagnostic load test[J].Journal of performance ofconstructed facilities,2008,22(4);264-273.
[5]金伟良,赵羽习.混凝土结构耐久性研究的回顾与展望[J].浙江大学学报,2002,36(4):371-402JIN WEI-LIANG,ZHAO YU-XI.State-of-the-art ondurability of concrete structures[J].Journal ofZhejiang University,2002,36(4):371-402.
[6]ZHOUZHI,HEJIAN-PING,YAN KAI,et al.Fiber-reinforced polymer-packaged optical fiber sensors basedon brillouin optical ti me-domain analysis[J].OpticalEngineering,2008,47(1):1-10.
[7]KAI TAI WAN,CHRISTOPHER K Y LEUNG.Applications of a distributed fiber optic crack sensor forconcrete structures[J].Sensors and Actuators,2007,135:458-464.
[8]金伟良.基于布里渊时域分析技术在公路隧道结构健康监测系统中的研究[R].杭州:浙江大学,2009.
[9]张桂生,毛江鸿,何勇,等.基于BOTDA的隧道变形监测技术研究[J].公路交通科技:应用技术版.2009,56(8):190-192.ZHANG GUI-SHENG,MAO JIANG-HONG,HEYONG,et al.Tunnel deformation monitoring methodbased on BOTDA[J].Journal of Highway andTransportation Research and Development:ApplidedTechnique.2009,56(8):190-192.
[10]UCHIYAMA H,SAKAIRI Y,NOZAKI T.Anoptical fiber strain distribution measurement instrumentusing the new detection method[J].ANDO TechnicalBulletin,2002,October:52-60.
[11]KWON I-B,KI M C-Y,CHOI M.Y.Distributedstrain and temperature measurement of a beam usingfiber optical BOTDA sensor[J].Proc SPIE,2003,5057:486-496.
[12]ANSARI,F,YUAN,L.Mechanics of bond andinterface shear transfer in optical fiber sensors[J].J.Engrg.Mech,ASCE,1998,124(4):385-394.
[13]傅翼,金伟良,粟京,等.海底管道中长距离徼管真空灌浆试验研究[J].新型建筑材料.2005,10:14-19FU YI,JIN WEI-LIANG,SUJING,et al.Experi mentalstudy on vacuumgrouting for long distance microtubuleof submarine pipeline[J].Chinese Journal of NewBuilding Materials,2005,10:14-19.
[14]GB50152-92混凝土结构试验方法标准[S].北京:中国建筑工业出版社,1992.
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