多种纤维层间混杂黏贴对钢筋混凝土梁延性影响的试验研究
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摘要
针对碳纤维黏贴的钢筋混凝土梁的强度增强和延性改善不一致的现象,采用多种纤维层间混杂黏贴方式对钢筋混凝土梁进行处理,通过三分点加载试验研究纤维的种类、黏贴顺序以及混杂比例对试验梁抗弯承载力、变形能力以及延性的影响。研究结果表明:纤维材料的极限拉伸强度越大,配布量越大,对试验梁极限承载力提高越明显,与无加固梁相比提高了38.8%～65.3%;纤维材料的断裂延伸率越大,加固梁的变形能力就越好;各试验方案中,芳纶/玄武岩/碳纤维层间混杂黏贴的方式对试验梁的延性提升作用最明显,其综合延性指标和能量延性指标相比于碳纤维梁分别提高了44.8%和125.0%,该混杂纤维加固方式可为有抗震要求的加固设计提供参考。
In view of the phenomenon that the strength and ductility of the reinforced concrete beam bonded with carbon fiber are inconsistent, the reinforced concrete beam is strengthened by a variety of fiber hybrid methods.The effect of fiber type, pasting sequence, and mixing ratio on the bending capacity, deformation capacity, and ductility of the test beam was investigated by a three-point loading test. The test results show that the greater the ultimate tensile strength of the fiber material and the greater the amount of the distribution, the more significant the ultimate bearing capacity of the test beam is, which is increased by 38.8%～65.3% compared with the non-reinforced beam; the greater the elongation at break of the fiber material, the better the deformability of the reinforcing beam; in all experimental schemes, the aramid/basalt/carbon fiber interlaminar hybrid method has the most obvious effect on the ductility of the test beam. The comprehensive ductility index and energy ductility index increase by 44.8% and 125.0% respectively compared to the carbon fiber beam. The hybrid fiber reinforcement method can provide reference for the reinforcement design with seismic requirements.
In view of the phenomenon that the strength and ductility of the reinforced concrete beam bonded with carbon fiber are inconsistent, the reinforced concrete beam is strengthened by a variety of fiber hybrid methods.The effect of fiber type, pasting sequence, and mixing ratio on the bending capacity, deformation capacity, and ductility of the test beam was investigated by a three-point loading test. The test results show that the greater the ultimate tensile strength of the fiber material and the greater the amount of the distribution, the more significant the ultimate bearing capacity of the test beam is, which is increased by 38.8%～65.3% compared with the non-reinforced beam; the greater the elongation at break of the fiber material, the better the deformability of the reinforcing beam; in all experimental schemes, the aramid/basalt/carbon fiber interlaminar hybrid method has the most obvious effect on the ductility of the test beam. The comprehensive ductility index and energy ductility index increase by 44.8% and 125.0% respectively compared to the carbon fiber beam. The hybrid fiber reinforcement method can provide reference for the reinforcement design with seismic requirements.
引文
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[16]GB/T3354-1991,定向纤维增强塑料拉伸性能试验方法[S].GB/T3354-1991,Test method for tensile properties of oriented fiber reinforced plastics[S].
[17]庄江波.预应力CFRP布加固钢筋混凝土梁的试验研究与分析[D].北京:清华大学,2005:14-25.ZHUANG Jiangbo.Experimental study and analysis of RC T-beams strengthened with prestressed CFRPsheets[D].Beijing:Tsinghua University,2005:14-25.
[2]LI Jianchun,Steve L Bakoss.Reinforcement of concrete beam-column connections with hybrid FRP sheet[J].Composite Structures,1999(47):805-812.
[3]褚云朋,贾彬.混杂纤维布加固损伤混凝土梁抗弯承载性能试验研究[J].混凝土与水泥制品,2016(10):38-42.CHU Yunpeng,JIA Bin.Experimental research on bending capacity properties of hybrid fiber reinforced damaged concrete beam[J].China Concrete and Cement Products,2016(10):38-42.
[4]WU Zhishen,NIU Hedong.Recent developments in FRPstrengthening techniques[C]//The 3th China FRPAcademic Thesis Album,Nanjing:Industrial construction,2004:1-8.
[5]杨建中.混杂纤维复合材料的匹配及其在混凝土结构加固中的应用研究[D].汕头:汕头大学,2009:86-87.YANG Jianzhong.Matching of hybrid fiber composites and their applied research in strengthening concrete structures[D].Shantou:Shantou University,2009:86-87.
[6]邓宗才,李建辉.混杂纤维布加固钢筋混凝土梁抗弯性能试验及理论研究[J].工程力学,2009,26(2):115-123.DENG Zongcai,LI Jianhui.Experimental and theoretical research on flexrual performance of RC beams strengthened with hybrid fiber sheets[J].Engineering Mechanics,2009,26(2):115-123.
[7]邓宗才,张戊晨.混杂纤维增强RPC加固混凝土梁抗弯性能[J].哈尔滨工程大学学报,2015,36(9):1199-1205.DENG Zongcai,ZHANG Wuchen.Flexrual performance of reinforced concrete beams reinforced with hybrid fiber reactive powder concrete[J].Journal of Harbin Engineering University,2015,36(9):1199-1205.
[8]王丹,郭志昆,邵飞,等.混杂纤维布加固轻骨料混凝土梁的试验研究[J].长安大学学报(自然科学版),2016,36(2):52-58.WANG Dan,GUO Zhikun,SHAO Fei,et al.Experimental study on LC beams strengthened with hybrid fiber sheets[J].Journal of Chang’an University(Natural Science Edition),2016,36(2):52-58.
[9]郭晓博.CFRP/GFRP层间混杂加固钢筋混凝土梁抗弯性能研究[D].重庆:重庆交通大学,2014:38-58.GUO Xiaobo.Experimental research on flexural performance of RC beams strengthened with hybrid CFRP/GFRP[D].Chongqing:Chongqing Jiaotong University,2014:38-58.
[10]彭利英,梁家熙,卫军.混杂纤维复合材料纵向拉伸性能的试验研究[J].世界地震工程,2016,32(2):25-30.PENG Liying,LIANG Jiaxi,WEI Jun.Experimental study on longitudinal tensile properties of hybrid fiber reinforced composites[J].World Earthquake Engineering,2016,32(2):25-30.
[11]Abdelrahaman A A,Tadro G,Rozkalla S H.Test model for the first Canadian smart highway bridge[J].ACIStructural Journal,1995,92(4):451-458.
[12]Mufti A A,Newhook J P,Tadros G.Deformability versus ductility in concrete beams with FRP reinforcement[C]//Proceedings of 2nd International on Advanced Composite Materials in Bridges and Structures Montreal,Quebec:CSCE,1996:189-199.
[13]Jaeger L G,Mufti A A,Macneill D W.Experimental verification of J-factor for steel and GFRP reinforcement in concrete T-beam[C]//Proceedings of Annual Conference of the Canadian Society for Civil Engineering Sherbrooke,Quebec:CSCE,1997:91-100.
[14]冯鹏,叶列平,黄羽立.受弯构件的变形性与新的性能指标的研究[J].工程力学,2005,22(6):29-36.FENG Peng,YE Lieping,HUANG Yuli.Deformability and new performance indices of flexural members[J].Engineering Mechanics,2005,22(6):29-36.
[15]Naaman A E,Jeong S M.Structural ductility of concrete beams prestressed with FRP tendons[C]//Proceedings of2nd International RILEM Symposium(FRPRCS-2)London:E&FN Spon,1995:379-401.
[16]GB/T3354-1991,定向纤维增强塑料拉伸性能试验方法[S].GB/T3354-1991,Test method for tensile properties of oriented fiber reinforced plastics[S].
[17]庄江波.预应力CFRP布加固钢筋混凝土梁的试验研究与分析[D].北京:清华大学,2005:14-25.ZHUANG Jiangbo.Experimental study and analysis of RC T-beams strengthened with prestressed CFRPsheets[D].Beijing:Tsinghua University,2005:14-25.
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