桥梁结构智能监测新技术研究
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摘要
桥梁在其服役期间,由于各种原因,会出现损伤和局部的破坏。为了保证桥梁的安全服役和延长使用寿命,应该实时地把握累积损伤的状况和结构继续服役的安全程度。本文利用预先埋入的光纤布拉格光栅传感器,实现了混凝土结构损伤过程中内部应变的测量,根据载荷-应变关系曲线斜率的分歧点,可确定结构内部损伤的形成和扩展,是实现桥梁结构智能监测的一种新技术。
As a result of various causes,the concrete bridge will be subj ec ted to certain damage and local crack during the service period.In order to ens ure bridge structure safety service and extend service life,it is necessary to keep informed on state of damage and continue service safety.This paper presen ts a new technique on bridge structure smart health monitoring.The internal str ain measurement has completed,using the Fibre Bragg Grating(FBG)sensors em-bedded into con crete bridge structure.Thus,on the basis of branch point of Load-Strain curve,the damage initiation and damage extend can be determined.
As a result of various causes,the concrete bridge will be subj ec ted to certain damage and local crack during the service period.In order to ens ure bridge structure safety service and extend service life,it is necessary to keep informed on state of damage and continue service safety.This paper presen ts a new technique on bridge structure smart health monitoring.The internal str ain measurement has completed,using the Fibre Bragg Grating(FBG)sensors em-bedded into con crete bridge structure.Thus,on the basis of branch point of Load-Strain curve,the damage initiation and damage extend can be determined.
引文
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[3]CIMerzbacher,ADKersey,EJFriebele.FiberOpticSensorsinConcreteStructures[J].AReview,SmartMater.Struct,1996,(5):196-208.
[4]杨朝晖.工程结构安全监测的光纤传感技术及神经网络方法研究[D].成都:四川联合大学,1996.
[5]蔡德所.大坝裂缝光纤监测技术研究及坝基稳定性分析[R].哈尔滨:哈尔滨建筑大学,1998.
[6]欧进萍,关新春.土木工程智能结构体系的研究与发展[J].地震工程与工程振动,1999,(2).
[7]孙圣和,王延云,徐影.光纤测量与传感技术[M].哈尔滨:哈尔滨工业大学出版社,2000.
[8]鲍振武,刘钊,刘晶.传感器用特种光纤[J].光纤与光缆及应用技术,2000,(1).
[9]毛良明,孟爱东,张德银.光纤微弯传感器研究[J].传感技术学报,1999,(1).
[10]马乃兵,骆飞,张德银.光纤微弯压力传感器[J].光纤与光缆及其应用技术,1999,(1).
[11]杨建良,向清,黄德修.城墙型光纤应变传感器[J].电子学报,1997,(8).
[12]查开德.用于大型结构应变测量的光纤传感器[J].中国激光,1995,(10).
[13]MasoudVaziri&Chin-linChen.EtchedFibersasStainGauges[J].J.OfLightwaveTechnology,1992,(10):836-841.
[14]AxelHolst,WolfgangHabel,RainerLessing.Fiber-OpticInten-sity-modulatedSensorsforContinousOberservationofConcreteandRock-fillDams[J].SPIE,1stEuropeanconf.OnSmartStruc-turesandMaterials,Glasgow,1992.
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