主管夹层灌混凝土的K型搭接节点滞回耗能分析
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摘要
为了探究主管夹层灌混凝土加强措施对圆钢管K型搭接节点滞回性能的影响,对1个主管夹层灌混凝土的K型搭接节点试件和1个未加强K型搭接节点试件进行低周往复拟静力试验,得到了节点的滞回曲线、骨架曲线、承载力、延性系数和能量耗散系数等抗震性能指标,试验结果表明:主管夹层灌混凝土,可有效提高节点的承载力、强度储备和耗能能力,但对节点的延性影响不大。利用ANSYS软件建立节点数值分析模型,模拟结果与试验结果吻合较好,并针对内套管钢材等级、主管钢材等级及混凝土等级开展有限元参数分析。分析结果表明:内套管钢材等级的增加不利于节点的滞回耗能,当采用Q235B时节点的滞回性能最好;当主管钢材等级为Q345B时,节点的各项性能均表现良好,滞回耗能能力最优;而混凝土等级对节点滞回性能影响较小,分析结果可为该类节点的优化设计提供一些参考。
In order to investigate the hysteretic behavior of unstiffened overlapped K-joints of circular tubular with the chord strengthened by the concrete-filled double skin, quasi-static test of low-cycle reciprocating is carried out for a unreinforced unstiffened overlapped K-joint and a unstiffened overlapped K-joint with the chord strengthened by the concrete-filled double skin. The hysteresis curve, skeleton curve, bearing capacity, ductility coefficient and energy dissipation coefficient of the joints are obtained. The results show that: the bearing capacity, strength reserve and energy dissipation capacity of the joints can be improved effectively by the concrete-filled double skin, but it has little effect on ductility of joints. The ANSYS software is used to establish the numerical analysis model of joints. The simulation results are in good agreement with the test results, and the finite element parameters are analyzed for the steel grade of the inner casing, the steel grade of the chord and the concrete grade. The analysis results show that the increase of the steel grade of the inner casing is not conducive to the hysteretic performance and energy dissipation of the joints; when the inner casing adopts Q235 B, the hysteretic performance of the joints is the best; when the steel grade of the chord is Q345, the performance of the joints is good and the hysteretic energy dissipation is optimal. The concrete grade has little effect on the hysteretic behavior of the joints, which provides some references for the optimization and design of this kind of joints.
In order to investigate the hysteretic behavior of unstiffened overlapped K-joints of circular tubular with the chord strengthened by the concrete-filled double skin, quasi-static test of low-cycle reciprocating is carried out for a unreinforced unstiffened overlapped K-joint and a unstiffened overlapped K-joint with the chord strengthened by the concrete-filled double skin. The hysteresis curve, skeleton curve, bearing capacity, ductility coefficient and energy dissipation coefficient of the joints are obtained. The results show that: the bearing capacity, strength reserve and energy dissipation capacity of the joints can be improved effectively by the concrete-filled double skin, but it has little effect on ductility of joints. The ANSYS software is used to establish the numerical analysis model of joints. The simulation results are in good agreement with the test results, and the finite element parameters are analyzed for the steel grade of the inner casing, the steel grade of the chord and the concrete grade. The analysis results show that the increase of the steel grade of the inner casing is not conducive to the hysteretic performance and energy dissipation of the joints; when the inner casing adopts Q235 B, the hysteretic performance of the joints is the best; when the steel grade of the chord is Q345, the performance of the joints is good and the hysteretic energy dissipation is optimal. The concrete grade has little effect on the hysteretic behavior of the joints, which provides some references for the optimization and design of this kind of joints.
引文
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[2] 吴捷,蒋剑峰,戴雅萍,等.K形圆钢管搭接节点受力特点及极限承载力分析研究[J].工业建筑, 2009, 39(1): 122-127Wu Jie,Jiang Jianfeng,Dai Yaping,et al.Research on forced performance and ultimate capacity of overlapped tubular K-joint[J].Industrial Construction,2009, 39(1): 122-127(in Chinese)
[3] 赵宪忠,吴晓风,陈以一,等.施工工艺对空间 KK 型圆钢管搭接节点静力性能的影响研究[J].建筑结构学报, 2016, 37(8): 123-130Zhao Xianzhong,Wu Xiaofeng,Chen Yiyi,et al.Study on effect of construction process multiplanar overlapped CHS on static behavior of KK-joints[J].Journal of Building Structures, 2016, 37(8): 123-130(in Chinese)
[4] 杨文伟,王秀丽.钢管桁架结构K形搭接节点抗震性能试验研究[J].建筑结构学报, 2013, 34(1): 85-92Yang Wenwei, Wang Xiuli. Experimental research on seismic behavior of unstiffenedoverlapped CHS K-joints[J]. Journal of Building Structures, 2013,34(1):85-92(in Chinese)
[5] 陈宝春,黄文金.圆管截面桁梁极限承载力试验研究[J].建筑结构学报, 2007,28(3): 31-36Chen Baochun,Huang Jinwen.Experimental research on ultimate load carrying capacity of truss girders made with circular tubes[J]. Journal of Building Structures,2007,28(3): 31-36(in Chinese)
[6] 陈宝春,黄文金.钢管混凝土K形相贯节点极限承载力试验研究[J].土木工程学报, 2009,42 (12): 91-98Chen Baochun,Huang Jinwen.Experimental study on ultimate bearing capacity of CFST directly welded K-joints [J].China Civil Engineering Journal, 2009,42(12): 91-98(in Chinese)
[7] Chen Y, Feng R, Xiong L. Experimental and numerical investigations on steel-concrete-PVC SHS joints under axial compression[J]. Construction and Building Materials, 2016, 102: 654-670
[8] Yin Y, Han Q H, Bai L J, et al. Experimental study on hysteretic behaviour of tubular N-joints[J]. Journal of Constructional Steel Research, 2009, 65(2): 326-334
[9] 陈娟,陈驹,金伟良.圆钢管混凝土T形相贯节点耗能机制研究[J].建筑结构学报, 2013, 34(S1): 128-133Chen Juan, Chen Ju, Jin Weiliang. Study of energy dissipation mechanism of concrete-filled steel tubular T-joints[J]. Journal of Build-ing Structures, 2013,34(S1):128-133(in Chinese)
[10] van der VEGTE G J, CHOO Y S, LIANG J X,et al. Static strength of T-joints reinforced with doubler or collar plates Ⅱ:numerical simulations[J].Journal of Structural Engineering,ASCE,2005,131(1): 129-138