光纤布拉格光栅传感器在钢架结构健康监测中的应用研究
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摘要
光纤布拉格光栅(FBG)传感器凭借其体积小、灵敏度高、耐腐蚀、抗电磁干扰、分布或者准分布式测量、可实现远距离的监测与传输等优点,在土木工程健康监测中得到日益广泛的应用。本文在光纤布拉格光栅(FBG)传感器的传感原理、标定试验研究基础上,讨论了利用FBG传感系统监测钢架结构在冲击荷载作用下的应变和加速度的可行性;同时利用ANSYS有限元分析软件建立了适用于结构分析的有限元模型,对钢架结构进行了详细的仿真分析计算,最后对理论计算结果及实测结果进行了详细的对比分析,所取得的结果比较接近。研究表明,光纤布拉格光栅传感器可以很好的测量钢架结构的动态响应。
Fiber Bragg grating(FBG) sensors present a great deal of potential in monitoring the structural due to their advantages such as immunity to electromagnetic interference,light weight,small size,multiplexing capabilities,ease of installation and durability.In this paper,the sensing principle is explained at first, and the strain transferring character is conducted in the calibration experiment on the steel plate using universal testing machine,then the research work focus on the dynamic strain measurement and natural frequencies of a steel frame with three stories using a FBG sensing system through experimental and numerical calculation.Two FBG strain sensors were designed and mounted on the steel frame. In a series of impact loading experiments,the data measured by FBG sensors were collected throughout a commercial FBG wavelength interrogation system.The comparison of experimental and numerical results revealed that the FBG sensors have ability of measurement of the dynamic strain of the steel frame structure in real time.
Fiber Bragg grating(FBG) sensors present a great deal of potential in monitoring the structural due to their advantages such as immunity to electromagnetic interference,light weight,small size,multiplexing capabilities,ease of installation and durability.In this paper,the sensing principle is explained at first, and the strain transferring character is conducted in the calibration experiment on the steel plate using universal testing machine,then the research work focus on the dynamic strain measurement and natural frequencies of a steel frame with three stories using a FBG sensing system through experimental and numerical calculation.Two FBG strain sensors were designed and mounted on the steel frame. In a series of impact loading experiments,the data measured by FBG sensors were collected throughout a commercial FBG wavelength interrogation system.The comparison of experimental and numerical results revealed that the FBG sensors have ability of measurement of the dynamic strain of the steel frame structure in real time.
引文
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[11]周智.土木工程结构光纤光栅智能传感元件及其监测系统[D].哈尔滨:哈尔滨工业大学,2003.Zhou Z.Optical fiber smart bragg grating sensors andintelligent monitoring systems of civil infrastructures[D].Harbin:Harbin Institute of Technology,2003.
[2]李宏男,李东升,赵柏东.光纤健康监测方法在土木工程中的研究与应用进展[J].地震工程与工程振动,2002,22(6):76-83.Li H N,Li D S,Zhao B D.Progress in study and ap-plication of smart health monitoring method by fiberoptic sensor in civil engineering[J].Earthquake Engi-neering and Engineering Vibration,2002,22(6):76-83.
[3]Lee B.Review of the present status of optical fibersensors[J].Optical Fiber Technology,2003,2(9):57-79.
[4]CasasJ R,Cruz P J S.Fiber optic sensors for bridgemonitoring[J].Journal of Bridge Engineering,2003,8(6):362-373.
[5]Schroeck M,Eoke W,Graupner A.Strain monitor-ing in steel rock bolts using FBG sensor arrays[C]∥Application of Optical Fiber Sensors.Newport Beach:Editor Proceedings of SPIE 2000.4074.
[6]涂亚庆,刘兴长.光纤智能结构[M].重庆:重庆出版社,2000.Tu Y Q,Liu X C.Intelligent Structures Based onOptical Fibers[M].Chongqing:Chongqing Publish-ing house,2000.
[7]Nellen P M,Anderegg P,Bronnimann R,et al.Appli-cation of fiber optical and resistance strain gauges forlong-term surveillance of civil engineering Structures[C]∥Smart Systems for Bridges,Structures,andHighways.Editor Proceedings of SPIE 1997.77-861.
[8]薛伟辰,徐壮涛,刘晟.光纤光栅传感器在上海旗忠网球中心施工监控中的应用研究[J].结构工程师,2007,23(1):91-96.Xue W C,Xu Z T,Liu S.Application of fiber bragggrating sensors in construction monitoring of Shanghaiqizhong tennis center[J].Structural Engineers,2007,23(1):91-96.
[9]孙丽.光纤光栅传感技术与工程应用研究[D].大连:大连理工大学,2006.Sun L.Research of fiber bragg grating sensing tech-nology and engineering application[D].Dalian:DalianUniversity of Technology,2006.
[10]李宏男,李东升.土木工程结构安全性评估、健康监测及诊断述评[J].地震工程与工程振动,2002,22(3):82-90.Li H N,Li D S.Safety assessment,health monitor-ing and damage diagnosis for structures in civil engi-neering[J].Earthquake Engineering and EngineeringVibration,2002,22(3):82-90.
[11]周智.土木工程结构光纤光栅智能传感元件及其监测系统[D].哈尔滨:哈尔滨工业大学,2003.Zhou Z.Optical fiber smart bragg grating sensors andintelligent monitoring systems of civil infrastructures[D].Harbin:Harbin Institute of Technology,2003.
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