变幅反复加卸载下玻璃纤维复合筋与混凝土黏结性能
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摘要
对直径20 mm的玻璃纤维增强聚合物(GFRP)进行单调加载以及两种不同变幅反复加卸载拉拔试验,研究单调静载与变幅反复加卸载作用下GFRP筋与混凝土之间的黏结-滑移关系,加载端滑移量的变化,得到了变幅反复作用对黏结性能的影响规律,并对试验数据与BPE模型上升段曲线进行了拟合分析。结果表明:GFRP筋与混凝土极限黏结强度在反复拉拔荷载作用下会降低,反复加载值越大,降低越多;当拉拔荷载在一定范围时,变幅反复加卸载对黏结强度影响不显著,但均会有残余变形,黏结刚度较单调加载刚度最大可提高1. 76倍;变幅反复加卸载试验全过程黏结滑移曲线与单调加载的曲线不同,但在大于前期荷载时上升段规律与单调加载一致,并与BPE模型上升段曲线较吻合。
Pull-out tests were carried out for glass fiber reinforced polymer( GFRP) bars with 16 mm diameter by monotonic loading and two different variable range cyclic loadings,so as to study the changes of bond-slip relation and the slip of the loading end. The effect law of bond property under variable range loading was obtained,the test data were compared with the curve data of ascending stage of BPE model. The results showed that bond strength of GFRP bars and concrete decreased under variable range drawing loading,the greater the load value,the more the ultimate bond strength decreased; when the drawing load was within a certain bond force,the effect of variable range cyclic loading and unloading on bond strength was not obvious,but residual deformation happened at all stages,and bond stiffness increased 1.76 times higher than monotonic loading's; the bond-slip curve of variable range cyclic loading and unloading was different from monotonic loading's,but the law of ascending stage was consistent with monotonous loading when the loading was larger than previous load,and it was in good agreement with the curve of BPE model.
Pull-out tests were carried out for glass fiber reinforced polymer( GFRP) bars with 16 mm diameter by monotonic loading and two different variable range cyclic loadings,so as to study the changes of bond-slip relation and the slip of the loading end. The effect law of bond property under variable range loading was obtained,the test data were compared with the curve data of ascending stage of BPE model. The results showed that bond strength of GFRP bars and concrete decreased under variable range drawing loading,the greater the load value,the more the ultimate bond strength decreased; when the drawing load was within a certain bond force,the effect of variable range cyclic loading and unloading on bond strength was not obvious,but residual deformation happened at all stages,and bond stiffness increased 1.76 times higher than monotonic loading's; the bond-slip curve of variable range cyclic loading and unloading was different from monotonic loading's,but the law of ascending stage was consistent with monotonous loading when the loading was larger than previous load,and it was in good agreement with the curve of BPE model.
引文
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[26]AIELLO M A,LEONE M,PECCE M.Bond Performances of FRPRebars-Reinforced Concrete[J].Journal of Materials in Civil Engineering,2007,19(3):205-213.
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[28]FOCACCI F,NANNI A,BAKIS C E.Local Bond-Slip Relationship for FRP Reinforcement in Concrete[J].Journal of Composites for Construction,2000,4(1):24-31.
[29]COSENZA E,MANFREDI G,REALFONZO R.Behavior and Modeling of Bond of FRP Rebars to Concrete[J].Journal of Composites for Construction,1997,1(2):40-51.
[30]ELIGEHAUSEN R,POPOV E P,BERTERO V V.Local Bond Stress-Slip Relationships of Deformed Bars Under Generalized Excitations[R].California:California the University,1983.
[2]周洪,刘军,宋旱云.玻璃纤维筋拉伸力学性能试验研究[J].北京建筑工程学报,2013,29(3):20-23.
[3]刘小艳,王新瑞,刘爱华,等.海洋工程中GFRP筋耐久性研究进展[J].水利水电科技进展,2012(3):86-89.
[4]ZAMAN A,GUTUB S A,WAFA M A.A Review on FRPComposites Applications and Durability Concerns in the Construction Sector[J].Journal of Reinforced Plastics and Composites,2013,32(24):1966-1988.
[5]MA M L,WANG G L,MIAO D M,et al.A Review on Engineering Application of FRP Material:Case Study and Practice[J].Advanced Materials Research,2013,800:308-311.
[6]GU X,YU B,WU M.Experimental Study of the Bond Performance and Mechanical Response of GFRP Reinforced Concrete[J].Construction&Building Materials,2016,114:407-415.
[7]薛伟辰,王圆,方志庆.黏砂变形GFRP筋与约束混凝土之间的黏结性能[J].建筑材料学报,2013(1):6-11.
[8]TEKLE B H,KHENNANE A,KAYALI O.Bond Behaviour of GFRP Reinforcement in Alkali Activated Cement Concrete[J].Construction and Building Materials,2017,154:972-982.
[9]CARO M,JEMAA Y,DIRAR S,et al.Bond Performance of Deep Embedment FRP Bars Epoxy-Bonded into Concrete[J].Engineering Structures,2017,147:448-457.
[10]VINT L M.Investigation of Bond Properties of Glass Fibre Reinforced Polymer(GFRP)Bars in Concrete Under Direct Tension[D].Toronto:University of Toronto,2012.
[11]张卫东,王振波,孙文彬.FRP筋与混凝土黏结性能研究进展[J].玻璃钢/复合材料,2015(9):99-103,51.
[12]CARVELLI V,PISANI M A,POGGI C.High Temperature Effects on Concrete Members Reinforced with GFRP Rebars[J].Composites Part B:Engineering,2013,54:125-132.
[13]罗小勇,唐谢兴,孙奇.冻融循环作用下GFRP筋黏结性能试验研究[J].铁道科学与工程学报,2014(5):1-4.
[14]DAVALOS J F,KODKANI S S,RAY I,et al.Fracture Evaluation of GFRP-Concrete Interfaces for Freeze-Thaw and WetDry Cycling[J].Journal of Composite Materials,2008,42(14):1439-1466.
[15]SILVA M A G,BISCAIA H C.Effects of Exposure to Saline Humidity on Bond Between GFRP and Concrete[J].Composite Structures,2010,93(1):216-224.
[16]YAN F,LIN Z,YANG M.Bond Mechanism and Bond Strength of GFRP Bars to Concrete:a Review[J].Composites Part B:Engineering,2016,98:56-69.
[17]ALVES J,ELRAGABY A,ELSALAKAWY E.Durability of GFRP Bars’Bond to Concrete Under Different Loading and Environmental Conditions[J].Journal of Composites for Construction,2010,15(3):249-262.
[18]JULIANA A,EL-RAGABY A,EL-SALAKAWY E.Bond Strength of Glass FRP Bars in Concrete Subjected to Freeze-Thaw Cycles and Sustained Loads[C]//Proceedings of the 5th International Conference on FRP Composites in Civil Engineering(CICE2010).Beijing:2010.
[19]何政,孙颖.高应力重复加卸载下GFRP筋与混凝土的黏结性能[J].复合材料学报,2006(6):149-157.
[20]VELJKOVIC A,HAFFKE M M,CARVELLI V P.Matthias.Static and Fatigue Bond Behaviour of GFRP Bars and Concrete[C]//Proceedings of the 8th International Conference on FibreReinforced Polymer(FRP)Composites in Civil Engineering.Hong Kong:2016.
[21]BAENA M,TORRES L,TURON A,et al.Experimental Study of Bond Behaviour Between Concrete and FRP Bars Using a Pull-Out Test[J].Composites Part B:Engineering,2009,40(8):784-797.
[22]VILANOVA I,BAENA M,TORRES L,et al.Experimental Study of Bond-Slip of GFRP Bars in Concrete Under Sustained Loads[J].Composites Part B:Engineering,2015,74:42-52.
[23]ACI Committee.Guide Test Methods for Fiber-Reinforced Polymers(FRPs)for Reinforcing or Strengthening Concrete Structures:ACI440.3R-04[S].American Conctrte Institute,2004.
[24]CSA.Design and Construction of Building Structures with FiberReinforced Polymers:CSA S806-12[S].Toronto,Canada:Canadian Standards Association International,2012.
[25]COSENZA E,MANFREDI G,REALFONZO R.Development Length of FRP Straight Rebars[J].Composites Part BEngineering,2002,33(7):493-504.
[26]AIELLO M A,LEONE M,PECCE M.Bond Performances of FRPRebars-Reinforced Concrete[J].Journal of Materials in Civil Engineering,2007,19(3):205-213.
[27]MENG W J,LIU H X,LIU G J,et al.Bond-Slip Constitutive Relation Between BFRP Bar and Basalt Fiber Recycled-Aggregate Concrete[J].KSCE Journal of Civil Engineering,2016,20(5):1996-2006.
[28]FOCACCI F,NANNI A,BAKIS C E.Local Bond-Slip Relationship for FRP Reinforcement in Concrete[J].Journal of Composites for Construction,2000,4(1):24-31.
[29]COSENZA E,MANFREDI G,REALFONZO R.Behavior and Modeling of Bond of FRP Rebars to Concrete[J].Journal of Composites for Construction,1997,1(2):40-51.
[30]ELIGEHAUSEN R,POPOV E P,BERTERO V V.Local Bond Stress-Slip Relationships of Deformed Bars Under Generalized Excitations[R].California:California the University,1983.