喷射FRP拉伸力学性能的试验与分析
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摘要
为研究喷射FRP的拉伸力学性能,文中对13组试件进行了单向拉伸力学性能试验,分析其应力—应变曲线、抗拉强度、拉伸弹性模量、断裂伸长率等力学性能指标。研究纤维类型、树脂种类、纤维体积率、纤维长度、试件厚度等因素对喷射FRP力学性能的影响。结果显示:纤维类型和树脂种类对喷射FRP拉伸力学性能的影响十分明显;纤维体积率为20%~25%,纤维长度为40 mm时,喷射FRP能获得较好的力学性能;喷射FRP试件厚度增加并不能持续有效的增强力学性能,不宜过厚。研究表明:为获得较好的力学性能,喷射FRP宜采用碳纤维喷射纱和乙烯基酯树脂加工制作,纤维体积率和长度宜控制在一定范围,且材料厚度不宜过厚。
To study the tensile properties of sprayed FRP,13 groups of specimens were tested for their tensile properties,and the index of stress-strain curve,tensile strength,elastic modulus,elongation and other mechanical properties were analyzed. Influence of fiber type,resin type,fiber volume fraction,fiber length,specimen thickness and other factors on the mechanical properties of sprayed FRP was studied. The results show that the effect of fiber type and resin type on the tensile properties of sprayed FRP is very obvious; that,when the fiber volume fraction is 20% ~ 25% and the fiber length is 40 mm,sprayed FRP demonstrates better mechanical properties; that the mechanical properties of sprayed FRP specimens cannot be effectively enhanced with the increase of the thickness of specimens,and the sprayed FRP should not be too thick. In order to obtain better mechanical properties,sprayed FRP had better be produced by carbon fiber sprayed yarn and vinyl ester resin,the volume ratio and length of fiber should be limited to a certain range,and the thickness of the material should not be too thick.
To study the tensile properties of sprayed FRP,13 groups of specimens were tested for their tensile properties,and the index of stress-strain curve,tensile strength,elastic modulus,elongation and other mechanical properties were analyzed. Influence of fiber type,resin type,fiber volume fraction,fiber length,specimen thickness and other factors on the mechanical properties of sprayed FRP was studied. The results show that the effect of fiber type and resin type on the tensile properties of sprayed FRP is very obvious; that,when the fiber volume fraction is 20% ~ 25% and the fiber length is 40 mm,sprayed FRP demonstrates better mechanical properties; that the mechanical properties of sprayed FRP specimens cannot be effectively enhanced with the increase of the thickness of specimens,and the sprayed FRP should not be too thick. In order to obtain better mechanical properties,sprayed FRP had better be produced by carbon fiber sprayed yarn and vinyl ester resin,the volume ratio and length of fiber should be limited to a certain range,and the thickness of the material should not be too thick.
引文
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[2]BOYD A J,LIANG N,GREEN P S,et al.Sprayed FRP repair of simulated impact in prestressed concrete girders[J].Construction and Building Materials,2008,22(3):411-416.
[3]YANG Zhao,WU Cai.Analysis on the seismic performance of RC frame beam-column joints strengthened by sprayed FRP[J].Applied Mechanics and Materials,2014,578-579:835-838.
[4]谷倩,张广海,蒋华,等.喷射GFRP抗震加固开门洞砌体墙试验研究[J].华中科技大学学报:自然科学版,2011,39(9):102-107.
[5]GB/T 1447-2005纤维增强塑料拉伸性能试验方法[S].北京:中国标准出版社,2005.
[6]周乾,闫维明,纪金豹,等.CFRP加固古建筑榫卯节点振动台试验[J].广西大学学报:自然科学版,2011,36(1):37-44.
[7]张智.喷射GFRP加固砌体结构抗震性能试验研究与理论分析[D].武汉理工大学土木工程与建筑学院,2010.
[8]BOYD A J.Rehabilitation of reinforced concrete beams with sprayed glass giber reinforced polymers[D].Doctoral Thesis,The University of British Columbia,2000.
[9]王彬,杨勇新,岳清瑞,等.复合理论预测国产碳纤维复合材料筋拉伸强度的离散性研究[J].玻璃钢/复合材料,2014(12):63-67.
[10]王自柯.国产碳纤维及其增强树脂基复合材料的结构与性能研究[D].哈尔滨工业大学土木工程学院,2012.
[11]彭雨佳.喷射混杂BF/CFRP加固震损混凝土框架柱抗震性能的试验研究[D].武汉理工大学土木工程与建筑学院,2013.
[2]BOYD A J,LIANG N,GREEN P S,et al.Sprayed FRP repair of simulated impact in prestressed concrete girders[J].Construction and Building Materials,2008,22(3):411-416.
[3]YANG Zhao,WU Cai.Analysis on the seismic performance of RC frame beam-column joints strengthened by sprayed FRP[J].Applied Mechanics and Materials,2014,578-579:835-838.
[4]谷倩,张广海,蒋华,等.喷射GFRP抗震加固开门洞砌体墙试验研究[J].华中科技大学学报:自然科学版,2011,39(9):102-107.
[5]GB/T 1447-2005纤维增强塑料拉伸性能试验方法[S].北京:中国标准出版社,2005.
[6]周乾,闫维明,纪金豹,等.CFRP加固古建筑榫卯节点振动台试验[J].广西大学学报:自然科学版,2011,36(1):37-44.
[7]张智.喷射GFRP加固砌体结构抗震性能试验研究与理论分析[D].武汉理工大学土木工程与建筑学院,2010.
[8]BOYD A J.Rehabilitation of reinforced concrete beams with sprayed glass giber reinforced polymers[D].Doctoral Thesis,The University of British Columbia,2000.
[9]王彬,杨勇新,岳清瑞,等.复合理论预测国产碳纤维复合材料筋拉伸强度的离散性研究[J].玻璃钢/复合材料,2014(12):63-67.
[10]王自柯.国产碳纤维及其增强树脂基复合材料的结构与性能研究[D].哈尔滨工业大学土木工程学院,2012.
[11]彭雨佳.喷射混杂BF/CFRP加固震损混凝土框架柱抗震性能的试验研究[D].武汉理工大学土木工程与建筑学院,2013.