钢筋增强PP ECC长柱试验
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摘要
目的研究钢筋增强PP ECC长柱力学性能,以期满足工程设计的抗震要求.方法对6根钢筋增强PP ECC柱和1根混凝土长柱进行轴压试验研究,分析不同长细比、龄期、配筋率等参数对柱子的破坏形态、变形特点和力学性能的影响.结果试验参数范围内,轴压长柱的承载力随着长细比的增加缓慢下降,PP ECC柱的破坏形态与普通混凝土明显不同.极限状态时,PP ECC的裂纹宽度控制在0.05 mm以内,并且未出现PP ECC的压溃崩碎现象.PP ECC的承载力随着配筋率的增加而增加,但延性呈缓慢下降趋势.随着龄期的增长,PP ECC延性有所下降,承载力虽然呈上升趋势,但变化不明显.结论轴压PP ECC柱的破坏形态未出现普通混凝土的压溃崩碎现象,其延性优于普通混凝土,抗震性能优异.
This paper is aimed at studying the mechanical properties of steel reinforced PP ECC columns,in the hope of meeting seismic requirements of the engineering design.Axial compression test was performed for 6 steel reinforced PP ECC and 1 concrete long columns,analyzing the effect of different slenderness ratio,age,reinforcement ratio and other parameters on the columns of failure forms,deformation characteristics and mechanical properties.Within the scope of test parameters,the bearing capacity of long columns under axial compression declines slowly with the slenderness ratio increases.Failure forms of PP ECC columns are apparently different from that of common concrete columns.In the limit state,PP ECC crack width is controlled within 0.05mm and crushing phenomenon does not appear.The bearing capacity of PP ECC long columns is increased with reinforcement ratio increases,but the ductility decreased slowly.With the growth of age,ductility of PP ECC declines,the bearing capacity rises,but not significantly.Failure form of PP ECC columns does not present the crushing phenomenon of common concrete columns,ductility is superior to common concrete,and seismic performance is excellent.
This paper is aimed at studying the mechanical properties of steel reinforced PP ECC columns,in the hope of meeting seismic requirements of the engineering design.Axial compression test was performed for 6 steel reinforced PP ECC and 1 concrete long columns,analyzing the effect of different slenderness ratio,age,reinforcement ratio and other parameters on the columns of failure forms,deformation characteristics and mechanical properties.Within the scope of test parameters,the bearing capacity of long columns under axial compression declines slowly with the slenderness ratio increases.Failure forms of PP ECC columns are apparently different from that of common concrete columns.In the limit state,PP ECC crack width is controlled within 0.05mm and crushing phenomenon does not appear.The bearing capacity of PP ECC long columns is increased with reinforcement ratio increases,but the ductility decreased slowly.With the growth of age,ductility of PP ECC declines,the bearing capacity rises,but not significantly.Failure form of PP ECC columns does not present the crushing phenomenon of common concrete columns,ductility is superior to common concrete,and seismic performance is excellent.
引文
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[16]Yang E H,Li V C.Strain-hardening fiber cement op-timization and component tailoringby means of a mi-cromechanical model[J].Construction and BuildingMaterials,2010,24(2):130-139.
[2]Anun P,Worsak K.Health monitoring of highwaybridges based on a global flexibility index[J].Engi-neering Structures,2005,27:1385-1391.
[3]陈婷,高强.高弹PVA纤维增强水泥基材料的研制与性能[D].合肥:合肥工业大学,2004.(ChenTing,GaoQiang.High play PVA fiber rein-forced cement base material research and perform-ance[D].Hefei:Hefei University of Technology,2004.)
[4]Sahmaran M,Li V C.Influence of micro-cracking onw ater absorption and sorptivity of ECC[J].RILEMJ.of Materials and Structures,2009,42:593-603.
[5]Li Hongnan,Li Bing.Study of a new macro-finite el-ement model for seismic performance of RC shearw alls using quasi-static experiments[J].Advances inStructural Engineering,2006,9(2):173-184.
[6]于洁,陈玲俐.钢筋混凝土框架节点抗震性能研究进展[J].世界地震工程,2005,26(2):65-71.(Yu Jie,Chen Linli.Seismic performance of rein-forced concrete frame research[J].World Earth-quake Engineering,2005,26(2):65-71.)
[7]Victor C L,Dhanada K M,Hwai-Chung Wu,et al.Matrix design for pseudo strain-hardening fiber rein-forced cementitious composites[J].RILEM J.Mate-rials and Structures,2005,28(183):586-595.
[8]Qian Jiaru,Zhao Zuozhou,Peng Mingying,et al.Ex-periments on flexural behavior of steel tw isted box-section members of the national stadium[J].Journalof Building Structures,2007,18(2):112-119.
[9]Li V C.On engineered cementitious composites(ECC)-a review of the material and its applications[J].Advanced Concrete Technology,2003,1(3):215-230.
[10]Li V C,Wang S,Wu C.Tensile strain-hardening be-havior of PVA-ECC[J].ACI Materials,2001,98(6):483-492.
[11]高淑玲.PVA纤维增强水泥基复合材料假应变硬化及断裂特性研究[D].大连:大连理工大学,2006.(Gao Shuling.PVA fiber reinforced cement basecomposite materials false strain hardening and frac-ture characteristics research[D].Dalian:Dalian Uni-versity of Technology,2006.)
[12]饶芳芬.粉煤灰对超高韧性水泥基复合材料弯曲性能的影响试验研究[D].大连:大连理工大学,2008.(Rao Fangfen.Fly ash to the extremely high tough-ness cement base composite mate-rial influence onthe performance of the bending test research[D].Dalian:Dalian University of Technology,2008.)
[13]关天发,袁鸿.CFRP加固钢筋混凝土曲梁的抗弯性能试验研究[J].中山大学学报,2008,40(2):109-113.(Guan Tianfa,Yuan Hong.Experimental study onbending properties of RC curved beam strengthenedw ith CFRP[J].Acta Scientiarum Naturalium Uni-versitatis Sunyatren,2008,40(2):109-113.)
[14]李庆华.配筋超高韧性水泥基复合材料受弯构件计算理论与试验研究[D].大连:大连理工大学,2009.(Li Qinghua.Reinforcement high toughness cementbase composite materials subject-ed to bending com-putational theory and the experimental research[D].Dalian:Dalian University of Technology,2009.)
[15]田艳华.自密实超高韧性水泥基复合材料试验研究[D].大连:大连理工大学,2008.(Tian Yanhua.Self-compacting high toughness ce-ment base composite material test research[D].Dalian:Dalian University of Technology,2008.)
[16]Yang E H,Li V C.Strain-hardening fiber cement op-timization and component tailoringby means of a mi-cromechanical model[J].Construction and BuildingMaterials,2010,24(2):130-139.
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