钢框架梁腹板两半圆孔削弱型节点滞回性能分析
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摘要
提出了梁腹板中心部分不削弱,仅梁腹板上、下开两半圆孔削弱型节点(TSCR),以期使得削弱处有更多的梁截面发展屈曲变形。首先运用有限元软件ABAQUS对已有的腹板圆孔削弱型节点试件进行了循环荷载作用下的模拟验证,然后对不同梁腹板削弱形式的梁柱节点的滞回行为进行对比,最后对TSCR节点的3个关键参数进行分析。结果表明:本文的有限元建模方法可以较好地模拟梁腹板削弱型节点的滞回行为;不同形式的梁腹板削弱不会明显降低节点的承载能力,TSCR节点有更多的梁截面发展屈曲变形,且能较好地缓解焊缝处的Mises应力集中程度;节点的承载力和梁翼缘焊缝处的Mises应力随着半圆孔高度h或开孔半径r的增大而逐渐降低;节点的承载力和梁翼缘焊缝处的Mises应力随着开孔中心距离梁端的距离l的增大而稍有增大;建议参数h=(0.58～0.65)r,r=0.35 h_b,l=(0.85～1.10)h_b,其中h_b为梁截面高度。
The beam-column connection with two semi-circular holes reduction in the beam web without reduction in the beam web center(TSCR) is put forward so that more beam sections in the reduction region could be involved in buckling. First, the finite element analysis ABAQUS is adopted to simulate the tested connection specimen with a circular hole in the beam web under cyclic loading to verify the modeling methods of this paper. The hysteretic performance of connections with different beam web reduction forms is compared then. Last, the parametric analysis is conducted for the TSCR connection's three key parameters. The results show that the modelling methods of this paper could simulate the hysteretic behavior of connections with beam web reduction. The bearing capacity would not decrease significantly. More beam sections could be involved in buckling for the TSCR connection, and the Mises stress concentration in the welds could be improved bitterly. The parametric analysis suggested that: the larger the semi-circular holes height h and hole radius r, the smaller the bearing capacity and the smaller Mises stress in the beam flange welds; the larger the distance between the hole center and the beam end l, the slight larger the bearing capacity and Mises stress in the beam flange welds. It is suggested that the parameters of h=(0.58～0.65) r, r=0.35 h_b, l=(0.85～1.10) h_b are reasonable for use in TSCR connection, where h_b is the beam height.
The beam-column connection with two semi-circular holes reduction in the beam web without reduction in the beam web center(TSCR) is put forward so that more beam sections in the reduction region could be involved in buckling. First, the finite element analysis ABAQUS is adopted to simulate the tested connection specimen with a circular hole in the beam web under cyclic loading to verify the modeling methods of this paper. The hysteretic performance of connections with different beam web reduction forms is compared then. Last, the parametric analysis is conducted for the TSCR connection's three key parameters. The results show that the modelling methods of this paper could simulate the hysteretic behavior of connections with beam web reduction. The bearing capacity would not decrease significantly. More beam sections could be involved in buckling for the TSCR connection, and the Mises stress concentration in the welds could be improved bitterly. The parametric analysis suggested that: the larger the semi-circular holes height h and hole radius r, the smaller the bearing capacity and the smaller Mises stress in the beam flange welds; the larger the distance between the hole center and the beam end l, the slight larger the bearing capacity and Mises stress in the beam flange welds. It is suggested that the parameters of h=(0.58～0.65) r, r=0.35 h_b, l=(0.85～1.10) h_b are reasonable for use in TSCR connection, where h_b is the beam height.
引文
[1] GB 50011-2010, 建筑抗震设计规范[S]GB 50011-2010, Code for seismic design of building[S](in Chinese)
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[4] 戴绍斌, 刘文吉, 黄俊. 狗骨式刚性连接节点的受力性能试验研究[J]. 武汉理工大学学报, 2004: 26(12): 56-58Dai Shao-bin, Liu Wen-ji, Huang Jun. Experimental research on working behavior of dog-bone style connection joint[J]. Journal of Wuhan University of Technology, 2004,26(12): 56-58(in Chinese)
[5] 杨庆山. 梁腹板开圆孔的钢框架抗震节点[J]. 中国安全科学学报, 2005, 15(2): 45-50Yang Qing-shan. Aseismic connection of steel moment-resisting frame with opening on beam web[J]. China Safety Science Journal, 2005, 15(2): 45-50(in Chinese)
[6] 杨庆山, 李波, 杨娜. 梁腹板开圆孔钢框架梁柱节点的性能研究[J]. 工程力学, 2007, 24(9): 111-121Yang Qing-shan, Li Bo, Yang Na. Investigation on behaviors of the connection with opening in beam web of steel moment resisting frames[J]. Engineering Meahanics, 2007, 24(9): 111-121(in Chinese)
[7] 卢林枫, 徐莹璐, 郑宏, 等. 带混凝土楼板的钢框架梁柱弱轴连接节点滞回性能试验研究[J]. 建筑结构学报, 2017, 38(12): 12-21Lu Lin-feng, Xu Ying-lu, Zheng Hong, et al. Experimental investigation on cyclic performance of beam-to-column weak-axis connections with concrete slab in steel frame[J]. Journal of Building Structures, 2017, 38(12): 12-21(in Chinese)
[8] Hedayat A A, Celikag M. Post-northridge connection with modified beam end configuration to enhance strength and ductility[J]. Journal of Constructional Steel Research, 2009, 65: 1413-1430
[9] 马江萍, 刘清颖, 赵冉. 梁腹板开平行长孔型节点滞回性能分析[J]. 钢结构, 2018, 33(1): 12-18Ma Jiang-ping, Liu Qing-ying, Zhao Ran. Hysteretic behavior analysis on beam-to-column connections with parallel rectangle perforations in the beam web[J]. Steel Construction, 2018, 33(1): 12-18(in Chinese)
[2] Jones S L, Fry G T, Engelhardt M D. Experimental evaluation of cyclically loaded reduced beam section moment connections[J]. Journal of Structural Engineering, 2002, 128(4): 441-451
[3] Momenzadeh S, Kazemi M T, Asl M H. Seismic performance of reduced web section moment connections[J]. International Journal of Steel Structures, 2017, 17(2): 413-425
[4] 戴绍斌, 刘文吉, 黄俊. 狗骨式刚性连接节点的受力性能试验研究[J]. 武汉理工大学学报, 2004: 26(12): 56-58Dai Shao-bin, Liu Wen-ji, Huang Jun. Experimental research on working behavior of dog-bone style connection joint[J]. Journal of Wuhan University of Technology, 2004,26(12): 56-58(in Chinese)
[5] 杨庆山. 梁腹板开圆孔的钢框架抗震节点[J]. 中国安全科学学报, 2005, 15(2): 45-50Yang Qing-shan. Aseismic connection of steel moment-resisting frame with opening on beam web[J]. China Safety Science Journal, 2005, 15(2): 45-50(in Chinese)
[6] 杨庆山, 李波, 杨娜. 梁腹板开圆孔钢框架梁柱节点的性能研究[J]. 工程力学, 2007, 24(9): 111-121Yang Qing-shan, Li Bo, Yang Na. Investigation on behaviors of the connection with opening in beam web of steel moment resisting frames[J]. Engineering Meahanics, 2007, 24(9): 111-121(in Chinese)
[7] 卢林枫, 徐莹璐, 郑宏, 等. 带混凝土楼板的钢框架梁柱弱轴连接节点滞回性能试验研究[J]. 建筑结构学报, 2017, 38(12): 12-21Lu Lin-feng, Xu Ying-lu, Zheng Hong, et al. Experimental investigation on cyclic performance of beam-to-column weak-axis connections with concrete slab in steel frame[J]. Journal of Building Structures, 2017, 38(12): 12-21(in Chinese)
[8] Hedayat A A, Celikag M. Post-northridge connection with modified beam end configuration to enhance strength and ductility[J]. Journal of Constructional Steel Research, 2009, 65: 1413-1430
[9] 马江萍, 刘清颖, 赵冉. 梁腹板开平行长孔型节点滞回性能分析[J]. 钢结构, 2018, 33(1): 12-18Ma Jiang-ping, Liu Qing-ying, Zhao Ran. Hysteretic behavior analysis on beam-to-column connections with parallel rectangle perforations in the beam web[J]. Steel Construction, 2018, 33(1): 12-18(in Chinese)