无端板矩形钢管混凝土构件基本剪切性能研究
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摘要
该文进行了8个无端板矩形钢管混凝土构件基本剪切性能试验,考察了截面尺寸和剪跨比(0.3～0.8)对构件抗剪承载力及钢管和混凝土滑移的影响规律。结果表明:剪跨比为0.3时构件发生剪切破坏,随着剪跨比增大,构件破坏模式从剪切破坏逐步向弯曲破坏转化,并且随着剪跨比增大,构件抗剪承载力显著降低,核心混凝土滑移量也呈现减小趋势。同时,用有限元软件ABAQUS对试验结果进行了数值模拟,计算结果与试验结果总体上吻合良好,验证了建模方法的可靠性。在此基础上,研究了钢管与核心混凝土之间的摩擦粘结、构件有无端板及加载主轴方向对矩形钢管混凝土构件基本剪切性能的影响规律。表明钢管与混凝土接触面摩擦系数取0.25时与试验结果符合程度较好;端板对构件荷载-位移关系曲线屈服荷载无太大影响,但对曲线后期强化有一定影响;不同加载主轴方向对构件抗剪承载力有显著影响。
The shear performance of 8 concrete filled rectangular steel tubular members without end-plate was tested. The influences of the section size and shear-span ratio(0.3-0.8) on shear capacity and slip behavior were studied. The result indicates that the specimens experience shear failure when the shear-span ratio is 0.3. With the increasing of shear-span ratio, the failure pattern of the specimens changes from shear failure to bending failure, the shear capacity decreases, and the slip of core concrete decreases. The numerical simulation was carried out using ABAQUS, and the calculating results agree well with the test results in general. The model was verified by the tested results. The influences of parameters such as friction and bonding, with or without end-plate and different axial loading were investigated on the shear performance of the specimens. The results show that calculating results agree well with the test results when the friction coefficient is 0.25 in finite element model. The end-plate has a small effect on the yield platform of load-displacement curves, but it has a great effect on the strength of load-displacement curves. The axial load affects the shear capacity significantly.
The shear performance of 8 concrete filled rectangular steel tubular members without end-plate was tested. The influences of the section size and shear-span ratio(0.3-0.8) on shear capacity and slip behavior were studied. The result indicates that the specimens experience shear failure when the shear-span ratio is 0.3. With the increasing of shear-span ratio, the failure pattern of the specimens changes from shear failure to bending failure, the shear capacity decreases, and the slip of core concrete decreases. The numerical simulation was carried out using ABAQUS, and the calculating results agree well with the test results in general. The model was verified by the tested results. The influences of parameters such as friction and bonding, with or without end-plate and different axial loading were investigated on the shear performance of the specimens. The results show that calculating results agree well with the test results when the friction coefficient is 0.25 in finite element model. The end-plate has a small effect on the yield platform of load-displacement curves, but it has a great effect on the strength of load-displacement curves. The axial load affects the shear capacity significantly.
引文
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[9]李志强,陈以一.方?矩形钢管混凝土剪切性能研究现状[J].建筑科学与工程学报,2013,30(3):62―70.Li Zhiqiang,Chen Yiyi.Research status on shearing performance of square and rectangular concrete-filled tubes[J].Journal of Architecture and Civil Engineering,2013,30(3):62―70.(in Chinese)
[10]王志滨,周继忠.矩形钢管混凝土构件剪切性能研究[J].广西大学学报(自然科学版),2013,38(1):28―35.Wang Zhibin,Zhou Jizhong.Research on shear property of rectangular concrete-filled steel tubular specimens[J].Journal of Guangxi University:Natural Science Edition,2013,38(1):28―35.(in Chinese)
[11]Ye Y,Han L H,Tao Z,et al.Experimental behavior of concrete-filled steel tubular members under lateral shear loads[J].Journal of Constructional Steel Research,2016,122:226―237.
[12]Beck J,Kiyomiya O.Fundamental pure torsional properties of concrete filled circular steel tubes[J].Materials,Construct Structure Pavements,JSCE,2003,739(60):285―296.
[2]肖岩,黄叙.圆钢管混凝土轴压短柱弹塑性全过程分析[J].建筑结构学报,2011,32(12):195―201.Xiao Yan,Huang Xu.Analytical study of circular concrete-filled steel tube stub columns under axial compression[J].Journal of Building Structures,2011,32(12):195―201.(in Chinese)
[3]Li G C,Liu D,Yang Z J,et al.Flexural behavior of high strength concrete filled high strength square steel tube[J].Journal of Constructional Steel Research,2017,128:732―744.
[4]尧国皇,韩林海.钢管自密实高性能混凝土压弯构件力学性能研究[J].建筑结构学报,2004,25(4):34―42.Yao Guohuang,Han Linhai.Research on behavior of self-consolidation concrete filled steel tubular beam-columns[J].Journal of Building Structures,2004,25(4):34―42.(in Chinese)
[5]陶忠,王志滨,韩林海.矩形冷弯型钢钢管混凝土柱的力学性能研究[J].工程力学,2006,23(3):147―155.Tao Zhong,Wang Zhibin,Han Linhai.Behavior of rectangular cold-formed steel tubular columns filled with concrete[J].Engineering Mechanics,2006,23(3):147―155.(in Chinese)
[6]肖从真,蔡绍怀,徐春丽.钢管混凝土抗剪性能试验研究[J].土木工程学报,2005,38(4):5―11.Xiao Congzhen,Cai Shaohuai,Xu Chunli.Experimental study on shear resistance performance of concrete-filled steel tube columns[J].China Civil Engineering Journal,2005,38(4):5―11.(in Chinese)
[7]钱稼茹,崔瑶,方小丹.钢管混凝土柱受剪承载力试验[J].土木工程学报,2007,40(5):1―9.Qian Jiaru,Cui Yao,Fang Xiaodan.Shear strength tests of concrete-filled steel tube columns[J].China Civil Engineering Journal,2007,40(5):1―9.(in Chinese)
[8]Han L H,Tao Z,Yao G H.Behaviour of concrete-filled steel tubular members subjected to shear and constant axial compression[J].Thin-Walled Structures,2008,46(3):765―780.
[9]李志强,陈以一.方?矩形钢管混凝土剪切性能研究现状[J].建筑科学与工程学报,2013,30(3):62―70.Li Zhiqiang,Chen Yiyi.Research status on shearing performance of square and rectangular concrete-filled tubes[J].Journal of Architecture and Civil Engineering,2013,30(3):62―70.(in Chinese)
[10]王志滨,周继忠.矩形钢管混凝土构件剪切性能研究[J].广西大学学报(自然科学版),2013,38(1):28―35.Wang Zhibin,Zhou Jizhong.Research on shear property of rectangular concrete-filled steel tubular specimens[J].Journal of Guangxi University:Natural Science Edition,2013,38(1):28―35.(in Chinese)
[11]Ye Y,Han L H,Tao Z,et al.Experimental behavior of concrete-filled steel tubular members under lateral shear loads[J].Journal of Constructional Steel Research,2016,122:226―237.
[12]Beck J,Kiyomiya O.Fundamental pure torsional properties of concrete filled circular steel tubes[J].Materials,Construct Structure Pavements,JSCE,2003,739(60):285―296.