CFRP筋粘结式锚具锚固性能试验
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摘要
针对碳纤维增强塑料(CFRP)作为预应力筋或拉索时出现的锚固问题,开发了一种以活性粉末混凝土(RPC)作为粘结介质的粘结式锚具。建立了平均粘结强度及其对应的滑移量、临界锚固长度以及粘结滑移本构模型等计算公式。通过静载试验研究了筋材表面形状、锚固长度、根数、间距、套筒内壁倾角以及筋材预张拉等对锚固性能的影响。结果表明:CFRP筋的表面形状对以RPC作为粘结介质的粘结式锚具的锚固性能有着决定性影响;当表面压纹CFRP筋的抗拉强度不大于3 000 MPa,RPC抗压强度不小于130 MPa时,对于普通粘结试件,临界锚固长度为20倍筋材直径;对于预张拉粘结试件,当预张比为56%时,锚固系统具有最短的临界锚固长度为13倍筋材直径;多筋同时锚固时,其间距不宜小于1倍筋材直径。
Aimed at anchorage problems that carbon fiber reinforced polymer/plastics(CFRP) was used as prestress tendon and cable reactive powder concrete(RPC) was regarded as bond medium and based on it,a new bond-type anchorage was developed.The calculated formulas of average bond strength and its corresponding slip,critical anchorage length,and bond-slip constitutive model were proposed.Influences of surface shape,bond length,number and space of CFRP tendons,slope angle of inner wall of steel sleeve and pretensioning load on anchorage performance were studied by static test.Test results show that the surface shape of CFRP tendon is significant to the anchorage performance of the bond-type anchorage.When the tensile strength of the indented surface CFRP tendon is less than 3 000 MPa and compressive strength of RPC is more than 130 MPa,the critical anchorage length is 20 diameters of general CFRP tendon for common bond specimen,the shortest critical anchorage length in anchorage system is 13 diameters of pretensioning CFRP tendon with ratio of 56% of pretensioning load.The appropriate rod space is not less than rod diameter for the anchorage system with multiple CFRP tendons.
Aimed at anchorage problems that carbon fiber reinforced polymer/plastics(CFRP) was used as prestress tendon and cable reactive powder concrete(RPC) was regarded as bond medium and based on it,a new bond-type anchorage was developed.The calculated formulas of average bond strength and its corresponding slip,critical anchorage length,and bond-slip constitutive model were proposed.Influences of surface shape,bond length,number and space of CFRP tendons,slope angle of inner wall of steel sleeve and pretensioning load on anchorage performance were studied by static test.Test results show that the surface shape of CFRP tendon is significant to the anchorage performance of the bond-type anchorage.When the tensile strength of the indented surface CFRP tendon is less than 3 000 MPa and compressive strength of RPC is more than 130 MPa,the critical anchorage length is 20 diameters of general CFRP tendon for common bond specimen,the shortest critical anchorage length in anchorage system is 13 diameters of pretensioning CFRP tendon with ratio of 56% of pretensioning load.The appropriate rod space is not less than rod diameter for the anchorage system with multiple CFRP tendons.
引文
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[14]高丹盈,朱海棠,谢晶晶.纤维增强塑料筋混凝土粘结滑移本构模型[J].工业建筑,2003,33(7):41-44.GAO Dan-ying,ZHU Hai-tang,XIE Jing-jing.TheConstitutive Models for Bond Slip Relation BetweenFRP Rebars and Concrete[J].Industrial Construc-tion,2003,33(7):41-44.
[2]宿莹,吴智敏,胡程鹤,等.CFRP布加固钢筋混凝土梁的新型复合粘结技术[J].建筑科学与工程学报,2009,26(4):66-72.SU Ying,WU Zhi-min,HU Cheng-he,et al.New Hy-brid Bonding Technique of Reinforced Concrete BeamsStrengthened with CFRP Sheet[J].Journal of Archi-tecture and Civil Engineering,2009,26(4):66-72.
[3]陈凤山,赵国藩,王兆忠.CFRP加固损伤钢筋混凝土梁的性能试验[J].建筑科学与工程学报,2008,25(4):116-122.CHEN Feng-shan,ZHAO Guo-fan,WANG Zhao-zhong.Test on Performance of Damaged RC BeamsStrengthened with CFRP[J].Journal of Architectureand Civil Engineering,2008,25(4):116-122.
[4]周士金,刘荣桂,蔡东升,等.CFRP索和钢索斜拉桥地震响应分析与抗震验算[J].建筑科学与工程学报,2009,26(3):76-81.ZHOU Shi-jin,LIU Rong-gui,CAI Dong-sheng,et al.Seismic Response Analysis and Seismic ResistanceChecking of Cable-stayed Bridges with CFRP Cablesand Steel Cables[J].Journal of Architecture and CivilEngineering,2009,26(3):76-81.
[5]NANNI A,BAKIS C E,O NEIL E F,et al.Perform-ance of FRP Tendon-anchor Systems for PrestressedConcrete Structures[J].PCI Journal,1996,41(1):34-43.
[6]TAHA M M R,SHRIVE N G.New Concrete An-chors for Carbon Fiber Reinforced Polymer Post-ten-sioning Tendons-Part1:State-of-the-art Review/De-sign[J].ACI Structural Journal,2003,100(1):86-95.
[7]BRAHIM B,ZHANG B R,ADIL C.Tensile Prop-erties and Pullout Behaviour of AFRP and CFRPRods for Grouted Anchor Applications[J].Construc-tion and Building Materials,2000,14(3):157-170.
[8]吕志涛,梅葵花.国内首座CFRP索斜拉桥的研究[J].土木工程学报,2007,40(1):54-59.LU Zhi-tao,MEI Kui-hua.First Application of CFRPCables for a Cable-stayed Bridge in China[J].ChinaCivil Engineering Journal,2007,40(1):54-59.
[9]蒋业东,邓年春,龙跃,等.多丝碳纤维拉索静载试验研究[J].预应力技术,2006(4):63-67.JIANG Ye-dong,DENG Nian-chun,LONG Yue,et al.The Static Load Tests of Multi-wire CarbonFiber Reinforced Polymer Stay-cables[J].PrestressTechnology,2006(4):63-67.
[10]张继文,朱虹,吕志涛,等.预应力FRP筋锚具的研发[J].工业建筑,2004,34(增):259-262.ZHANG Ji-wen,ZHU Hong,LU Zhi-tao,et al.Devel-opment of Anchor Devices of Prestressed FRP Ten-don[J].Industrial Construction,2004,34(S):259-262.
[11]方志,梁栋,蒋田勇.不同粘结介质中CFRP筋锚固性能的试验研究[J].土木工程学报,2006,39(6):47-51.FANG Zhi,LIANG Dong,JIANG Tian-yong.Experi-mental Investigation on the Anchorage Performance ofCFRP Tendon in Different Bond Mediums[J].ChinaCivil Engineering Journal,2006,39(6):47-51.
[12]BAYARD O,PLE O.Fracture Mechanics of ReactivePowder Concrete:Material Modeling and Experimen-tal Investigations[J].Engineering Fracture Mechan-ics,2003,70(7/8):839-851.
[13]COSENZA E,MANFREDI G,REALFONZO R.Be-havior and Modeling of Bond of FRP Rebars to Con-crete[J].Journal of Composites for Construction,1997,1(2):40-51.
[14]高丹盈,朱海棠,谢晶晶.纤维增强塑料筋混凝土粘结滑移本构模型[J].工业建筑,2003,33(7):41-44.GAO Dan-ying,ZHU Hai-tang,XIE Jing-jing.TheConstitutive Models for Bond Slip Relation BetweenFRP Rebars and Concrete[J].Industrial Construc-tion,2003,33(7):41-44.
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