带肋中空夹层方钢管混凝土柱轴压性能的试验研究
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摘要
由于普通钢管混凝土柱容易出现局部屈曲等问题,近年来,出现了在钢管混凝土内设置加劲肋的新型组合柱的应用与研究,期望通过结构形式的变化改善钢管混凝土的力学性能。作者研究了不同加劲肋类型对钢管混凝土柱的力学性能的影响。本试验设计了单肋、三角形肋、方形肋3种加劲肋形式和不同长细比的中空夹层方钢管混凝土,对其进行了轴心抗压试验。采用数字图像相关法对试件进行了全场应变监测和分析,同时,研究和分析了加劲肋形式对其极限承载力、延性、局部屈曲、荷载位移的影响。试验结果表明,不同长细比试件产生局部屈曲的位置最容易发生在其长度的1/8处至端面范围内或者距离端面1/8处至3/8处范围内。相较于无肋中空钢管混凝土,带肋试件的延性明显提高,其中,采用三角形肋的试件的延性平均提高了76%,但其承载力有不同程度的下降。对试件的极限承载力进行了预测,计算结果与试验结果吻合较好。
Due to the problem that local bucking is easy to occur on steel tube of concrete-filled skin steel tube(CFST) columns, the applications and researches of a new type composite column, CFST with stiffening ribs, have been reported in recent years, and the problem of CFST is expected to be solved through the change of structural form. In this paper, the effects of different types of stiffening ribs on mechanical properties of concrete-filled double skin steel tube(CFDST) columns were studied. Three types of stiffeners including single rib, triangle rib, and square rib were designed to strength CFDST columns, and three slenderness ratios of 4.0, 5.0 and 6.0 were applied for each section type of CFDST columns.The axial compression tests of CFDST columns were conducted, and full-filled strain of specimens were monitored and analyzed. Besides, the influences of different stiffener types on the ultimate bearing capacity, ductility, local bucking and load-displacement curve were investigated and analyzed. It was found that local bucking of CFDST columns with different slenderness ratios are most likely to occur from 1/8 of height to end face or from 1/8 to 3/8 of height. Compared with no-stiffener CFDST columns, the ductility of CFDST columns with stiffeners has improved greatly, and the specimens with triangle ribs show a 76% increase on average in ductility. However, the ultimate bearing capacity has different decrease. A modified formula is built and the calculated values are matched with test results well.
Due to the problem that local bucking is easy to occur on steel tube of concrete-filled skin steel tube(CFST) columns, the applications and researches of a new type composite column, CFST with stiffening ribs, have been reported in recent years, and the problem of CFST is expected to be solved through the change of structural form. In this paper, the effects of different types of stiffening ribs on mechanical properties of concrete-filled double skin steel tube(CFDST) columns were studied. Three types of stiffeners including single rib, triangle rib, and square rib were designed to strength CFDST columns, and three slenderness ratios of 4.0, 5.0 and 6.0 were applied for each section type of CFDST columns.The axial compression tests of CFDST columns were conducted, and full-filled strain of specimens were monitored and analyzed. Besides, the influences of different stiffener types on the ultimate bearing capacity, ductility, local bucking and load-displacement curve were investigated and analyzed. It was found that local bucking of CFDST columns with different slenderness ratios are most likely to occur from 1/8 of height to end face or from 1/8 to 3/8 of height. Compared with no-stiffener CFDST columns, the ductility of CFDST columns with stiffeners has improved greatly, and the specimens with triangle ribs show a 76% increase on average in ductility. However, the ultimate bearing capacity has different decrease. A modified formula is built and the calculated values are matched with test results well.
引文
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[14]Tao Zhong,Han Linhai,Huang Hong.Concrete-filled double skin steel tubular column with square section under recentric loads[J].China Civil Engineering Journal,2003,36(2):33-40.[陶忠,韩林海,黄宏.方中空夹层钢管混凝土偏心受压柱力学性能的研究[J].土木工程学报,2003,36(2):33-40.]
[2]Tao Z,Uy B,Han L H,et al.Analysis and design of concretefilled stiffened thin-walled steel tubular columns under axial compression[J].Thin-Walled Structures,2009,47(12):1544-1556.
[3]Liang W,Dong J F,Yuan S C,et al.Behavior of self-compacting concrete-filled steel tube columns with Inclined stiffener ribs under axial compression[J].Strength of Materials,2017,49(1):125-132.
[4]Huang C S,Yeh Y K,Liu G Y,et al.Axial load behavior of stiffened concrete-filled steel columns[J].Journal of Structural Engineering,2002,128(9):1222-1230.
[5]Long Y L,Cai J.Stress-strain relationship of concrete confined by rectangular steel tubes with binding bars[J].Journal of Constructional Steel Research,2013,88:1-14.
[6]Huang Hong,Zhang An′ge,Li Yi,et al.Experimental research and finite element analysis on mechanical performance of concrete-filled stffened square steel tubular stub columns subjected to axial compression[J].Journal of Building Strctures,2011,32(2):75-82.[黄宏,张安哥,李毅,等.带肋方钢管混凝土轴压短柱试验研究及有限元分析[J].建筑结构学报,2011,32(2):75-82.]
[7]Tao Z,Han L H,Wang Z B.Experimental behaviour of stiffened concrete-filled thin-walled hollow steel structural(HSS)stub columns[J].Journal of Constructional Steel Research,2005,61(7):962-983.
[8]Sun Yanyan,Wang Zhenbo,Sheng Chao,et al.The experimental research and finite element analysis of mechanics behavior of short concrete-filled square steel tubular columns with tibs[J].Chinese Journal of Applied Mechanics,2017,34(1):136-141.[孙焱焱,王振波,盛超,等.带肋方钢管混凝土短柱承载力及延性研究[J].应用力学学报,2017,34(1):136-141.]
[9]Nepomuceno M C S,de Pereira Oliveira L A,Lopes S MR.Methodology for the mix design of self-compacting concrete using different mineral additions in binary blends of powders[J].Construction and Building Materials,2014,64:82-94.
[10]Gao Jianxin,Zhou Xingeng.Principle and applications of digital speckle correlation method[J].Acta Mechanica Sinica,1995,27(6):724-731.[高建新,周辛庚.数字散斑相关方法的原理与应用[J].力学学报,1995,27(6):724-731.]
[11]Uy B.Local and post-local buckling of concrete filled steel welded box columns[J].Journal of Constructional Steel Research,1998,47(1):47-72.
[12]Xiao Jiangzhuang,Yang Jie,Huang Yijie,et al.Experimental study on recycled concrete confined by steel tube under axial compression[J].Journal of Building Structures,2011,32(6):92-98.[肖建庄,杨洁,黄一杰,等.钢管约束再生混凝土轴压试验研究[J].建筑结构学报,2011,32(6):92-98.]
[13]Han L H,Hou C,Wang Q L.Square concrete filled steel tubular(CFST)members under loading and chloride corrosion:Experiments[J].Journal of Constructional Steel Research,2012,71:11-25.
[14]Tao Zhong,Han Linhai,Huang Hong.Concrete-filled double skin steel tubular column with square section under recentric loads[J].China Civil Engineering Journal,2003,36(2):33-40.[陶忠,韩林海,黄宏.方中空夹层钢管混凝土偏心受压柱力学性能的研究[J].土木工程学报,2003,36(2):33-40.]