无粘结预应力筋与简支梁耦合振动的特性
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摘要
为了研究无粘结预应力梁振动特性,基于预应力筋和梁的分离式模型及其耦合振动特性,建立了预应力筋随梁耦合振动的张拉力变化时程方程和耦合振动特征方程。通过6根无粘结预应力钢筋混凝土梁电磁激振器扫频试验,测试了不同预应力条件下梁的基频。理论和试验的研究结果表明无粘结预应力对等值杆梁结构自振频率没有直接影响,但其布筋形态和预应力筋抗拉刚度影响梁自振特征值。
Based on the separate model and the characteristics on couple vibration of beam and tendons,time-integration equation of the tension cohesionless tendons with beam vibration and the frequency equation of beam vibration were presented to study the vibration characteristic of cohesionless prestressed concrete beam.In experimentation the basic frequencies were tested by sweep frequencies in electromagnetism vibration exciter to cohesionless tendons beams.Theoretical and experimental results show the infection of prestressing forces are very small in the basic frequencies of beam,and the frequency of prestressed beams with cohesionless tendons is influenced by the shape and extensional rigidity of tendons.
Based on the separate model and the characteristics on couple vibration of beam and tendons,time-integration equation of the tension cohesionless tendons with beam vibration and the frequency equation of beam vibration were presented to study the vibration characteristic of cohesionless prestressed concrete beam.In experimentation the basic frequencies were tested by sweep frequencies in electromagnetism vibration exciter to cohesionless tendons beams.Theoretical and experimental results show the infection of prestressing forces are very small in the basic frequencies of beam,and the frequency of prestressed beams with cohesionless tendons is influenced by the shape and extensional rigidity of tendons.
引文
[1]张耀庭,李宏健.全预应力混凝土梁动力性能试验研究[J]。工程力学,2008,25(1):71-75.
[2]YUNG HIN LIN,KUO CHUN CHANG,CHERN J C,et al.The health monitoring of a prestressed concrete beam by usingfiber Bnigg rating sensors[J].Smart Materials and Structures,2004,13(4):712-718.
[3]MAECK J,PEETERS B,DE ROECK G.Damageidentification.the Z24 bridge using vibration monitoring[J].Smart Materials and Structures,2001,10(3):512-517;
[4]MOISEA A.ABRAHAM,SOOYONG PAD,NORRISSTUBBS.Loss of prestress prediction based on nondestructivedamage location algorithms[C]∥Proceedings of SPIE-Thelntemational Society for Optical Engineering,1995,2446:60-67.
[5]JEONG-TAE KIM,YEON-SUN RYU,CHUNG-BANG YUN.Vibration-based method to detect prestress-loss in beam-typebridges[J].Proceedings of the SPIE-The International Societyfor Optical Engineering,2003,Vol.5057:559-568.
[6]王佳伟,贾艳敏.预应力简支钢箱梁自振频率研究[J].工程力学,2009,26(1):120-124.
[7]张耀庭,邱继生,黄恒卫.无粘结预应力混凝土梁的研究现状综述[J],华中科技大学学报2002,19(4):86-91.
[8]HARAJLI.M.Strengthening of concrete beam by externalprestressing[J].PCI Journal,1993,38(6):76-88.
[9]PISANI.M.A.Strengthening by means of external pre-stressing[J].Journal of Bridge Engineering,1999,ASCE,4(2):131-135.
[10]AYAHO,MIYAMOTO.Behavior of prestressed beamstrengthened with external tendons[J].Journal of StructuralEngineering,ASCE,2000,126(9):1033-1044.
[11]熊学玉,王寿生.体外无粘结预应力梁振动特性的分析与研究[J].地震工程与工程振动,2005,25(2):55-61.
[12]张道明,梁力.预应力内荷载的新计算方法—直接内载法[J].工程力学,2007,241(3):104-109.
[13]张道明,梁力,李明.预应力筋线型及预应力内荷载的分布规律[J].东北大学学报,2006,27(5):567-570.
[14]王勋文,刘建亮.关于“预应力对混凝土桥梁振动频率的影响”一文的讨论[J].国外桥梁,1998,3:32-34.
[15]刘晶波,杜修力.结构动力学[M].北京:机械工业出版社,2009.
[2]YUNG HIN LIN,KUO CHUN CHANG,CHERN J C,et al.The health monitoring of a prestressed concrete beam by usingfiber Bnigg rating sensors[J].Smart Materials and Structures,2004,13(4):712-718.
[3]MAECK J,PEETERS B,DE ROECK G.Damageidentification.the Z24 bridge using vibration monitoring[J].Smart Materials and Structures,2001,10(3):512-517;
[4]MOISEA A.ABRAHAM,SOOYONG PAD,NORRISSTUBBS.Loss of prestress prediction based on nondestructivedamage location algorithms[C]∥Proceedings of SPIE-Thelntemational Society for Optical Engineering,1995,2446:60-67.
[5]JEONG-TAE KIM,YEON-SUN RYU,CHUNG-BANG YUN.Vibration-based method to detect prestress-loss in beam-typebridges[J].Proceedings of the SPIE-The International Societyfor Optical Engineering,2003,Vol.5057:559-568.
[6]王佳伟,贾艳敏.预应力简支钢箱梁自振频率研究[J].工程力学,2009,26(1):120-124.
[7]张耀庭,邱继生,黄恒卫.无粘结预应力混凝土梁的研究现状综述[J],华中科技大学学报2002,19(4):86-91.
[8]HARAJLI.M.Strengthening of concrete beam by externalprestressing[J].PCI Journal,1993,38(6):76-88.
[9]PISANI.M.A.Strengthening by means of external pre-stressing[J].Journal of Bridge Engineering,1999,ASCE,4(2):131-135.
[10]AYAHO,MIYAMOTO.Behavior of prestressed beamstrengthened with external tendons[J].Journal of StructuralEngineering,ASCE,2000,126(9):1033-1044.
[11]熊学玉,王寿生.体外无粘结预应力梁振动特性的分析与研究[J].地震工程与工程振动,2005,25(2):55-61.
[12]张道明,梁力.预应力内荷载的新计算方法—直接内载法[J].工程力学,2007,241(3):104-109.
[13]张道明,梁力,李明.预应力筋线型及预应力内荷载的分布规律[J].东北大学学报,2006,27(5):567-570.
[14]王勋文,刘建亮.关于“预应力对混凝土桥梁振动频率的影响”一文的讨论[J].国外桥梁,1998,3:32-34.
[15]刘晶波,杜修力.结构动力学[M].北京:机械工业出版社,2009.
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