基于应变指标的桥梁损伤识别方法
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摘要
为了更好地实现桥梁的损伤识别、确保结构安全,探讨了应变指标(弯曲正应变和剪切应变)在桥梁损伤识别中的应用,给出了具体的应用方式,并通过多个数值模拟实例进行了验证;考虑到该指标的显著局部性,给出了测点优化布置的方法;考虑实际应用时的具体情况,分析了该方法识别结果的存在性、惟一性和稳定性问题,给出了有效的处理方法,使之有了很强的实用性。结果表明:该方法能直接发现损伤,对小损伤比较敏感,而且处理方式简单、结果可靠。
In order to safeguard the safety of bridges,capabilities to locate and quantify damage of strain indexes(including bending strain and shear strain) were considered as basic characteristics of the method to be investigated.The application processes of this kind of indexes were proposed and the effectivenesses were demonstrated by several numerical simulation examples.The optimization manner of measurement point was also proposed to meet the requirement of actual application.Furthermore,the existence,uniqueness and stability of the detection results were analyzed and then suggestions for improvement were provided.Results show that the method based on strain index is sensitive to tiny damage and allows simple,convenient detection for bridge damages.
In order to safeguard the safety of bridges,capabilities to locate and quantify damage of strain indexes(including bending strain and shear strain) were considered as basic characteristics of the method to be investigated.The application processes of this kind of indexes were proposed and the effectivenesses were demonstrated by several numerical simulation examples.The optimization manner of measurement point was also proposed to meet the requirement of actual application.Furthermore,the existence,uniqueness and stability of the detection results were analyzed and then suggestions for improvement were provided.Results show that the method based on strain index is sensitive to tiny damage and allows simple,convenient detection for bridge damages.
引文
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[19]任更锋,徐岳,石利强,等.基于层次分析法的在役RC桥梁耐久性评估[J].长安大学学报:自然科学版,2008,28(6):41-45,50.REN Geng-feng,XU Yue,SHI Li-qiang,et al.Dur-ability Evaluation of Existing Reinforced ConcreteBridges Based on AHP[J].Journal of Chang an Uni-versity:Natural Science Edition,2008,28(6):41-45,50.
[20]郭琦,史强,宋一凡,等.在役缺损梁桥动力分析的有限条刚度修正法[J].长安大学学报:自然科学版,2008,28(4):57-61.GUO Qi,SHI Qiang,SONG Yi-fan,et al.FiniteStripe Method of Stiffness Correction Based onModal Parameters for Existing Beam Bridge[J].Journal of Chang an University:Natural Science Edi-tion,2008,28(4):57-61.
[21]王树栋,卜建清,娄国充.基于过桥汽车动力响应的桥梁损伤识别[J].长安大学学报:自然科学版,2008,28(3):63-67.WANG Shu-dong,BU Jian-qing,LOU Guo-chong.Bridge Damage Identification by Dynamic Responseof Passing Vehicle[J].Journal of Chang an Univer-sity:Natural Science Edition,2008,28(3):63-67.
[2]MORASSI A.Damage Detection and GeneralizedFourier Coefficients[J].Journal of Sound and Vibra-tion,2007,302(1/2):229-259.
[3]HUTH O,FELTRIN G,MAECK J,et al.DamageIdentification Using Modal Data:Experiences on aPrestressed Concrete Bridge[J].Journal of StructuralEngineering,2005,131(12):1898-1910.
[4]CURADELLI R O,RIERA J D,AMBROSINI D,et al.Damage Detection by Means of StructuralDamping Identification[J].Engineering Structures,2008,30(12):3497-3504.
[5]REYNDERS E,DE ROECK G,BAKIR P G,et al.Damage Identification on the Tilff Bridge by Vibra-tion Monitoring Using Optical Fiber Strain Sensors[J].Journal of Engineering Mechanics,2007,133(2):185-193.
[6]LI Y Y,CHENG L,YAM L H,et al.Identification ofDamage Locations for Plate-like Structures UsingDamage Sensitive Indices:Strain Modal Approach[J].Composite Structures,2002,80(25):1881-1894.
[7]LIU X,LIEVEN N A J,ESCAMILLA-AMBROSIOP J.Frequency Response Function Shape-basedMethods for Structural Damage Localization[J].Mechanical Systems and Signal Processing,2009,23(4):1243-1259.
[8]HU H W,WU C B.Development of Scanning Dam-age Index for the Damage Detection of Plate Struc-tures Using Modal Strain Energy Method[J].Mechanical Systems and Signal Processing,2009,23(2):274-287.
[9]CAO M S,QIAO P Z.Novel Laplacian Scheme andMulti Resolution Modal Curvatures for StructuralDamage Identification[J].Mechanical Systems andSignal Processing,2009,23(4):1223-1242.
[10]TRENTADUE B,MESSINA A,GIANNOCCARO NI.Detecting Damage Through the Processing of Dy-namic Shapes Measured by a PSD-triangular LaserSensor[J].International Journal of Solids and Struc-tures,2007,44(17):5554-5575.
[11]KIM J T,PARK J H,LEE B J.Vibration-based Dam-age Monitoring in Model Plate-girder Bridges UnderUncertain Temperature Conditions[J].EngineeringStructures,2007,29(7):1354-1365.
[12]GUO H Y,LI Z L.A Two-stage Method to IdentifyStructural Damage Sites and Extents by Using Evi-dence Theory and Micro-search Genetic Algorithm[J].Mechanical Systems and Signal Processing,2009,23(3):769-782.
[13]CHEN H P.Application of Regularization Methodsto Damage Detection in Large Scale Plane FrameStructures Using Incomplete Noisy Modal Data[J].Engineering Structures,2008,30(11):3219-3227.
[14]PERERA R,HUERTA C,ORQUI N J M.Identifica-tion of Damage in RC Beams Using Indexes Based onLocal Modal Stiffness[J].Construction and BuildingMaterials,2008,22(8):1656-1667.
[15]张启伟,周艳.桥梁健康监测技术的适用性[J].中国公路学报,2006,19(6):54-58.ZHANG Qi-wei,ZHOU Yan.Applicability of BridgeHealth Monitoring Technology[J].China Journal ofHighway and Transport,2006,19(6):54-58.
[16]向天宇,赵人达.结构损伤识别的双重网格算法[J].中国公路学报,2006,19(4):94-97.XIANG Tian-yu,ZHAO Ren-da.Dual Mesh Methodfor Structure Damage Detection[J].China Journal ofHighway and Transport,2006,19(4):94-97.
[17]邵长江,吴永红,钱永久.混凝土桥梁结构非线性地震损伤演化[J].中国公路学报,2006,19(5):41-45.SHAO Chang-jiang,WU Yong-hong,QIAN Yong-jiu.Evolution of Nonlinear Seismic Damage of Con-crete Bridge Structure[J].China Journal of Highwayand Transport,2006,19(5):41-45.
[18]刘义艳,段晨东,巨永锋,等.基于神经网络与特征融合的损伤诊断方法[J].长安大学学报:自然科学版,2008,28(6):106-110.LIU Yi-yan,DUAN Chen-dong,JU Yong-feng,et al.Diagnosis Method of Structure Damage UsingNeural Network and Feature Fusion[J].Journal ofChang an University:Natural Science Edition,2008,28(6):106-110.
[19]任更锋,徐岳,石利强,等.基于层次分析法的在役RC桥梁耐久性评估[J].长安大学学报:自然科学版,2008,28(6):41-45,50.REN Geng-feng,XU Yue,SHI Li-qiang,et al.Dur-ability Evaluation of Existing Reinforced ConcreteBridges Based on AHP[J].Journal of Chang an Uni-versity:Natural Science Edition,2008,28(6):41-45,50.
[20]郭琦,史强,宋一凡,等.在役缺损梁桥动力分析的有限条刚度修正法[J].长安大学学报:自然科学版,2008,28(4):57-61.GUO Qi,SHI Qiang,SONG Yi-fan,et al.FiniteStripe Method of Stiffness Correction Based onModal Parameters for Existing Beam Bridge[J].Journal of Chang an University:Natural Science Edi-tion,2008,28(4):57-61.
[21]王树栋,卜建清,娄国充.基于过桥汽车动力响应的桥梁损伤识别[J].长安大学学报:自然科学版,2008,28(3):63-67.WANG Shu-dong,BU Jian-qing,LOU Guo-chong.Bridge Damage Identification by Dynamic Responseof Passing Vehicle[J].Journal of Chang an Univer-sity:Natural Science Edition,2008,28(3):63-67.
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