CFRP加固不同箍筋间距高强混凝土柱延性试验
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摘要
目的研究碳纤维(CFRP)布横向包裹加固两种在塑性铰区具有不同箍筋间距柱的延性性能.方法设计并制作了4个高强混凝土柱,对柱施加水平低周反复荷载,对比不同箍筋间距柱在加固前后的延性系数、能量耗散能力和刚度退化等情况,通过引入总体折算体积配箍特征值将柱构件所受外部约束定量化,比较试件所受的约束效果.结果在经过CFRP布加固后,塑性铰区箍筋间距较大(150 mm)柱的延性系数要大于箍筋间距较小(100 mm)未加固的柱,但仍然低于箍筋间距较小的加固后柱.试件的总体折算体积配箍特征值越大,所受外部约束越强,延性越好.结论在实际加固工程中,可以利用CFRP布横向加固方式来弥补柱构件因各种人为原因造成塑性铰区箍筋间距增大而损失的延性性能,加固后可以使其超过无箍筋缺陷时的延性水平.
The purpose of the paper is researching ductility behavior of two kinds of CFRP-confined columns with different stirrup spacing in the plastic hinge zone.Based on the test data of four high strength concrete columns tested under low-frequency cyclic lateral loading,the ductility coefficient,energy dissipation and stiffness degradation were compared.In order to quantify the confinement provided by the stirrups and CFRP sheets and compare the confinement effect between different columns,the parameter λe was defined in this paper.The results show that the CFRP-confined column with larger stirrup spacing(150 mm)exhibits higher ductility performance than the contrast column with smaller stirrup spacing(100 mm),but has lower ductility behavior than the CFRP-confined column with larger stirrup spacing.Along with the increase of the parameter λe value,the confinement caused by the stirrups and CFRP sheets is becoming stronger and stronger and the column ductility behavior is becoming better and better.In the actual strengthening project,when the human factors cause the stirrup spacing of column increased in the plastic hinge zone,the method of the wrapped CFRP sheets can be used to remedy the insufficient ductility,the ductility of strengthened column can exceed the level of column with no stirrup defects.
The purpose of the paper is researching ductility behavior of two kinds of CFRP-confined columns with different stirrup spacing in the plastic hinge zone.Based on the test data of four high strength concrete columns tested under low-frequency cyclic lateral loading,the ductility coefficient,energy dissipation and stiffness degradation were compared.In order to quantify the confinement provided by the stirrups and CFRP sheets and compare the confinement effect between different columns,the parameter λe was defined in this paper.The results show that the CFRP-confined column with larger stirrup spacing(150 mm)exhibits higher ductility performance than the contrast column with smaller stirrup spacing(100 mm),but has lower ductility behavior than the CFRP-confined column with larger stirrup spacing.Along with the increase of the parameter λe value,the confinement caused by the stirrups and CFRP sheets is becoming stronger and stronger and the column ductility behavior is becoming better and better.In the actual strengthening project,when the human factors cause the stirrup spacing of column increased in the plastic hinge zone,the method of the wrapped CFRP sheets can be used to remedy the insufficient ductility,the ductility of strengthened column can exceed the level of column with no stirrup defects.
引文
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[11]Wu Y F,Liu T,Wang L M.Experimental investiga-tion on seismic retrofitting of square RC columns bycarbon FRP sheet confinement combined w ith trans-verse short glass FRP bars in bored holes[J].Journalof Composites for Construction,2008,12(1):53-60.
[12]Elsouri A M,Harajli M H.Seismic repair andstrengthening of lap splices in RC columns:Carbonfiber-reinforced polymer versus steel confinement[J].Journal of Composites for Construction,2011,15(5):721-731.
[13]滕锦光,陈建飞,史密斯,等.FRP加固混凝土结构[M].北京:中国建筑工业出版社,2005.(Teng Jinguang,Chen Jianfei,Smith,et al.Concretestructure strengthened w ith FRP[M].Beijing:ChinaArchitecture and Building Press,2005.)
[14]王泽源.FRP增强高强混凝土T形梁延性机理与试验研究[D].大连:大连理工大学,2011.(Wang Zeyuan.Analytical and experimental studyon ductility of reinforced high strength concrete T-section beams retrofitted w ith FRP[D].Dalian:Dalian University of Technology,2011.)
[15]余文华.CFRP增强高强混凝土柱延性性能研究[D].大连:大连理工大学,2010.(Yu Wenhua.Study on ductility performance of rein-forced high concrete columns confined by CFRP[D].Dalian:Dalian University of Technology,2010.)
[16]周长东.玻璃纤维聚合物加固混凝土柱的力学性能研究[D].大连:大连理工大学,2003.(Zhou Changdong.Study on mechanical behavior ofRC columns strengthened w ith GFRP[D].Dalian:Dalian University of Technology,2003.)
[2]王文炜.FRP加固混凝土结构技术及应用[M].北京:中国建筑工业出版社,2007.(Wang W W.FRP strengthening of concrete struc-tures[M].Beijing:China Building Industry Press,2007)
[3]Ye L P,Zhang K,Zhao S H,et al.Experimentalstudy on seismic strengthening of RC columns w ithw rapped CFRP sheets[J].Construction and BuildingMaterials,2003,17(6-7):499-506.
[4]王苏岩,韩克双,曲秀华.CFRP加固高强混凝土柱改善延性的试验研究[J].世界地震工程,2005,21(3):7-10.(Wang Suyan,Han Keshuang,Qu Xiuhua.Experi-mental research on ductility behavior of high-strengthreinforced concrete columns strengthened w ith carbonfiber sheets[J].World Earthquake Engineering,2005,21(3):7-10)
[5]Anggawidjaja D,Ueda T,Dai J G,et al.Deformationacpacity of RC piers w rapped by new fiber-rrein-forced polymer w ith large fracture strain[J].Cementand Concrete Composites,2006,28(10):914-927.
[6]Binici B,Mosalam K M.Analysis of reinforced con-crete columns retrofitted w ith fiber reinforced poly-mer lamina[J].Composites Part B:Engineering,2007,38(2):265-276.
[7]Lin H J,Liao C I.Compressive strength of reinforcedconcrete column confined by composite material[J].Composite Structures,2004,65(2):239-250.
[8]Parvin A,Wang W.Concrete columns confined byfiber composite w raps under combined axial and cy-clic lateral loads[J].Composite Structures,2002,58(4):539-549.
[9]董旭华,王伟,肖岩,等.纤维塑料加固与修复RC短柱抗震性能试验[J].沈阳建筑大学学报:自然科学版,2006,22(2):252-256.(Dong Xuhua,Wang Wei,Xiao Yan,et al.Experi-mental study on seismic retrofit and repair of circularreinforcement concrete short columns by fiber rein-forced plastic[J].Journal of Shenyang Jianzhu Uni-versity:Natural Science,2006,22(2):252-256.)
[10]赵彤,周晓洁,谢剑,等.用碳纤维布改善钢筋混凝土极短柱抗震性能的试验研究[J].地震工程与工程振动,2002,22(1):85-91.(Zhao Tong,Zhou Xiaojie,Xie Jian,et al.Researchon improving seismic behavior of reinforced concreteshort column w ith continuous carbon fiber sheet[J].Earthquake Engineering and Engineering Vibration,2002,22(1):85-91.)
[11]Wu Y F,Liu T,Wang L M.Experimental investiga-tion on seismic retrofitting of square RC columns bycarbon FRP sheet confinement combined w ith trans-verse short glass FRP bars in bored holes[J].Journalof Composites for Construction,2008,12(1):53-60.
[12]Elsouri A M,Harajli M H.Seismic repair andstrengthening of lap splices in RC columns:Carbonfiber-reinforced polymer versus steel confinement[J].Journal of Composites for Construction,2011,15(5):721-731.
[13]滕锦光,陈建飞,史密斯,等.FRP加固混凝土结构[M].北京:中国建筑工业出版社,2005.(Teng Jinguang,Chen Jianfei,Smith,et al.Concretestructure strengthened w ith FRP[M].Beijing:ChinaArchitecture and Building Press,2005.)
[14]王泽源.FRP增强高强混凝土T形梁延性机理与试验研究[D].大连:大连理工大学,2011.(Wang Zeyuan.Analytical and experimental studyon ductility of reinforced high strength concrete T-section beams retrofitted w ith FRP[D].Dalian:Dalian University of Technology,2011.)
[15]余文华.CFRP增强高强混凝土柱延性性能研究[D].大连:大连理工大学,2010.(Yu Wenhua.Study on ductility performance of rein-forced high concrete columns confined by CFRP[D].Dalian:Dalian University of Technology,2010.)
[16]周长东.玻璃纤维聚合物加固混凝土柱的力学性能研究[D].大连:大连理工大学,2003.(Zhou Changdong.Study on mechanical behavior ofRC columns strengthened w ith GFRP[D].Dalian:Dalian University of Technology,2003.)
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