内置FRP约束混凝土的方钢管混凝土轴压承载力
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摘要
钢管混凝土FRP混凝土(SCFC)组合柱是新近提出的一种新型组合柱形式。提出考虑外钢管与FRP的双重约束效果,采用双剪统一理论分析了SCFC组合柱外钢管、外层混凝土、FRP管以及内层混凝土的应力状态,根据静力平衡条件得到了SCFC组合柱的轴压承载力计算公式,其与试验结果能够较好吻合。分析了含钢率、FRP与钢的相对配置率、FRP径厚比以及FRP管直径对轴压承载力提高系数的影响,结果表明:随着含钢率的增加、FRP与钢的相对配置率的提高以及FRP径厚比的减小,SCFC组合柱轴压承载力提高系数都有一定程度提高;内FRP管直径与外钢管边长之比在0.65~0.75之间时,轴压承载力增益效果较好。
The sectional form of steel-concrete-FRP-concrete(SCFC)column,as a novel composite column,has a steel tube as the outer layer and a circular FRP tube as the inner layer,and concrete filled between these two layers and within the FRP tube.Considering the confinements from both outer steel and inner FRP layers,the twin shear unified strength theory and force equilibrium condition are utilized to develop an analytical model of bearing capacity of SCFC column.The accuracy of the proposed model is evidenced through being compared with experimental data.The parametrical study is conducted in order to evaluate the confinements affected by the sectional steel proportion,ratio of FRP to steel,ratio of diameter to thickness of FRP and FRP diameter itself.The results indicate that the greater sectional steel proportion,the larger ratio of FRP to steel,and smaller ratio of diameter to thickness of FRP have positivecontributions on the confinements of SCFC.The ratio of FRP diameter to steel side length locates between0.65-0.75 can lead to a better confinement.
The sectional form of steel-concrete-FRP-concrete(SCFC)column,as a novel composite column,has a steel tube as the outer layer and a circular FRP tube as the inner layer,and concrete filled between these two layers and within the FRP tube.Considering the confinements from both outer steel and inner FRP layers,the twin shear unified strength theory and force equilibrium condition are utilized to develop an analytical model of bearing capacity of SCFC column.The accuracy of the proposed model is evidenced through being compared with experimental data.The parametrical study is conducted in order to evaluate the confinements affected by the sectional steel proportion,ratio of FRP to steel,ratio of diameter to thickness of FRP and FRP diameter itself.The results indicate that the greater sectional steel proportion,the larger ratio of FRP to steel,and smaller ratio of diameter to thickness of FRP have positivecontributions on the confinements of SCFC.The ratio of FRP diameter to steel side length locates between0.65-0.75 can lead to a better confinement.
引文
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[11]FENG P,CHENG S,BAI Y,et al.Mechanical behavior of concrete-filled square steel tube with FRPconfined concrete core subjected to axial compression[J].Composite Structures,2015,123:312-324.
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[15]李天华,魏雪英,赵均海,等.内置CFRP圆管的方钢管混凝土短柱力学性能研究[J].建筑结构学报,2009(Sup2):249-254.LI T H,WEI X Y,ZHAO J H,et al.Mechanical behavior of concrete filled square steel tube short columns with inner CFRP circular tube[J].Journal of Building Structures,2009(Sup2):249-254.(in Chinese)
[16]江佳斐,吴宇飞,李奔奔.约束混凝土内摩擦角的特性研究[C]//第23届全国结构工程学术会议论文集(第Ⅱ册),2014:47-51.
[2]CHEN J,JIN W L.Experimental investigation of thinwalled complex section concrete-filled steel stub columns[J].Thin-Walled Structures,2010,48(9):718-724.
[3]HEECHEUL K,HUN L K,HAK L Y,et al.Axial behavior of concrete-filled carbon fiber-reinforced polymer composite columns[J].Structural Design of Tall&Special Buildings,2012,21(3):178-193.
[4]WU Y F,JIANG C.Effect of load eccentricity on the stress-strain relationship of FRP-confined concrete columns[J].Composite Structures,2013,98(3):228-241.
[5]LAM L,TENG J G.Design-oriented stress-strain model for FRP-confined concrete[J].Construction&Building Materials,2003,17(6):471-489.
[6]HASSANEIN M F,KHAROOB O F,LIANG Q Q.Circular concrete-filled double skin tubular short columns with external stainless steel tubes under axial compression[J].Thin-Walled Structures,2013,73(4):252-263.
[7]钱稼茹,张扬,纪晓东,等.复合钢管高强混凝土短柱轴心受压性能试验与分析[J].建筑结构学报,2011,32(12):162-169.QIAN J R,ZHANG Y,JI X D,et al.Test and analysis of axial compressive behavior of short composite-sectioned high strength concrete filled steel tubular columns[J].Journal of Building Structures,2011,32(12):162-169.(in Chinese)
[8]李帼昌,麻丽,杨景利,等.内置CFRP圆管的方钢管高强混凝土轴压短柱承载力计算初探[J].沈阳建筑大学学报(自然科学版),2008,24(1):62-66.LI G C,MA L,YANG J L,et al.Bearing capacity of short columns of high-strength concrete filled square steel tubular with inner CFRP circular tubular under axially compressive load[J].Journal of Shenyang Jianzhu University(Natural Science),2008,24(1):62-66.(in Chinese)
[9]李帼昌,侯东序,李宁.内置CFRP圆管的方钢管高强混凝土偏压短柱试验[J].沈阳建筑大学学报(自然科学版),2009,25(5):871-876.LI G C,HOU D X,LI N.research on high-strength concrete filled square steel tubular short columns with inner CFRP circular tubeunder eccentric load[J].Journal of Shenyang Jianzhu University(Natural Science),2009,25(5):871-876.(in Chinese)
[10]李帼昌,邢娜,邢忠华.内置CFRP圆管的方钢管高强混凝土轴压短柱试验[J].沈阳建筑大学学报(自然科学版),2009,25(5):244-249.LI G C,XING N,XING Z H.experimental study on short columns of high strength concrete filled square steel tube with inner CFRP circular tube under axial compressive load[J].Journal of Shenyang Jianzhu University(Natural Science),2009,25(5):244-249.(in Chinese)
[11]FENG P,CHENG S,BAI Y,et al.Mechanical behavior of concrete-filled square steel tube with FRPconfined concrete core subjected to axial compression[J].Composite Structures,2015,123:312-324.
[12]CHENG S,FENG P,BAI Y,et al.Load-strain model for steel-concrete-FRP-concrete columns in axial compression[J].Journal of Composites for Construction,2016,20(5):0401617.
[13]韩林海,陶忠.方钢管混凝土轴压力学性能的理论分析与试验研究[J].土木工程学报,2001,34(2):17-25.HAN L H,TAO Z.Study on behavior of concrete filled square steel tubes under axial load[J].China Civil Engineering Journal,2001,34(2):17-25.(in Chinese)
[14]李小伟,赵均海,朱铁栋,等.方钢管混凝土轴压短柱的力学性能[J].中国公路学报,2006,19(4):77-81.LI X W,ZHAO J H,ZHU T D,et al.Mechanics behavior of axially loaded short columns with concretefilled square steel tube[J].China Journal of Highway and Transport,2006,19(4):77-81.(in Chinese)
[15]李天华,魏雪英,赵均海,等.内置CFRP圆管的方钢管混凝土短柱力学性能研究[J].建筑结构学报,2009(Sup2):249-254.LI T H,WEI X Y,ZHAO J H,et al.Mechanical behavior of concrete filled square steel tube short columns with inner CFRP circular tube[J].Journal of Building Structures,2009(Sup2):249-254.(in Chinese)
[16]江佳斐,吴宇飞,李奔奔.约束混凝土内摩擦角的特性研究[C]//第23届全国结构工程学术会议论文集(第Ⅱ册),2014:47-51.