隔板贯通方钢管柱-H型钢梁异型节点强震突变机理分析
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摘要
为研究隔板贯通方钢管柱-H型钢梁异型节点强震灾变机理和延性节点构造,对常规异型节点进行了低周往复循环加载试验和基于结构钢椭球面断裂模型及偶联的椭球面屈服模型的断裂分析.结果显示,常规异型节点在大截面梁翼缘对接焊缝边缘开裂,节点的塑性转角约为0.015rad,达不到FEMA要求的0.03rad.提出隔板圆弧扩大头节点构造并进行数值分析,结果表明,扩大头构造消除了对接焊缝沿梁翼缘宽度的几何突变,降低了对接焊缝的应力集中程度和脆断风险,塑性转角均达到了0.03rad,承载力较常规异型节点提高15.9%~39%.
In order to study disaster mechanism and ductile construction of diaphragm-through irregular joints of square steel tubular column and H-section steel beams under severe earthquakes,a diaphragmthrough conventional irregular joint was tested under low-cycle reversed loading,while fracture analysis was performed based on the elliptical fracture model coupled with an elliptical yield model of constructional steel.The results show that conventional irregular joint cracks at the edges of butt weld between flanges of large section beam and diaphragm ribs.The plastic rotation of the conventional irregular joint is about0.015 rad and could not match the minimum requirement 0.03 rad in FEMA.Therefore,an improved joint with enlarged arc junctures is designed and numerical simulated.The results show that the enlarged arc junctures eliminate the sharply changed geometry mutation of butt weld along the width of beam flanges,and reduce stress concentration and brittle fracture risk of butt weld.The plastic rotation of joints with enlarged arc junctures reaches at 0.03 rad.The bearing capacity of the irregular joints with enlarged arc junctures increases by 15.9%~39% compared with that of conventional irregular joints.
In order to study disaster mechanism and ductile construction of diaphragm-through irregular joints of square steel tubular column and H-section steel beams under severe earthquakes,a diaphragmthrough conventional irregular joint was tested under low-cycle reversed loading,while fracture analysis was performed based on the elliptical fracture model coupled with an elliptical yield model of constructional steel.The results show that conventional irregular joint cracks at the edges of butt weld between flanges of large section beam and diaphragm ribs.The plastic rotation of the conventional irregular joint is about0.015 rad and could not match the minimum requirement 0.03 rad in FEMA.Therefore,an improved joint with enlarged arc junctures is designed and numerical simulated.The results show that the enlarged arc junctures eliminate the sharply changed geometry mutation of butt weld along the width of beam flanges,and reduce stress concentration and brittle fracture risk of butt weld.The plastic rotation of joints with enlarged arc junctures reaches at 0.03 rad.The bearing capacity of the irregular joints with enlarged arc junctures increases by 15.9%~39% compared with that of conventional irregular joints.
引文
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[10]王万祯,陈飞益,黄友钱,等.箱型柱-H型钢梁节点断裂机理及梁翼缘扩大头和长槽孔节点研究[J].工程力学,2013,30(6):197-204.WANG Wan-zhen,CHEN Fei-yi,HUANG You-qian,et al.Fracture mechanism of joint of H-style steel beam-square steel tubular column and study on joints with horizontal haunch and slot holes at beam flanges[J].Engineering Mechanics,2013,30(6):197-204.
[11]毛辉,王燕.钢框架梁翼缘扩翼型节点受力性能研究.西安建筑科技大学学报(自然科学版)[J],2010,42(1):36-41.MAO Hui,WANG Yan.Study on the mechanical properties of wildened beam flange connections of steel frame[J].Journal of Xi’an University of Architecture Technology(Natural Science Edition),2010,42(1):36-41.
[12]王万祯.结构钢开裂准则及断裂试验分析[J].工程力学,2008,25(5):27-31.WANG Wan-zhen.Crack criterion and fracture tests of structural steel[J].Engineering Mechanics,2008,26(5):27-31.
[13]WANG Wan-zhen,QIAN Xu-dong,YANG Bao-zheng.Fracture in concrete-filled square hollow section to H-section joints under low-cycle loading[J].Journal of Constructional Steel Research,2014,101(10):363-372.
[14]王万祯,王伟焘,谢光杰.隔板贯通式箱型柱-H型钢梁节点循环加载试验和破坏机理分析[J].工程力学,2015,32(4):1-10.WANG Wan-zhen,WANG Wei-tao,XIE Guang-jie.Reversed loading tests and fracture mechanism on diaphragm-through joints of steel box column and H-section steel beam[J].Engineering Mechanics,2015,32(4):1-10.
[15]FEMA-267.Interim Guidelines:Evaluation,Repair,Modification and Design of Steel Moment Frames[R].Report No.SAC-95-02,SAC Joint Venture,California,1995:35-68.
[2]POPOV E P.Seismic moment connections for MRFs construct[J].Steel Research,1988,10:163-168.
[3]NAKASHIMA M,KANAO I,LIU D W.Lateral instability and lateral bracing of steel beams subjected to cyclic loading[J].Journal of Structural Engineering,ASCE,2002,128(10):1308-1316.
[4]KIM T,WHITTAKER A S,GILANI A S J,et al.Cover-plate and flange-plate steel moment-resisiting connections[J].Journal of Structural Engineering,ASCE,2002,128(4):474-482
[5]KIM T,KIM J.Collapse analysis of steel moment frames with various seismic connections[J].Journal of Constructional Steel Research,2008,65(6):1316-1322.
[6]LEE C H,JEON S W,KIM J H,et al.Effects of panel zone strength and beam web connection method on seismic performance of reduced beam section moment connections[J].Journal of Structural Engineering,ASCE,2005,131(12):1854-1865.
[7]庄磊.方管柱-H型钢梁隔板贯通式节点抗震性能的研究[J].建筑结构,2008,38(9):120-123.ZHUANG Lei,Seismic performance of H-beam to square tubular column connections with through diaphragms[J].Building Structure,2008,38(9):120-123.
[8]张文元,王想军,朱福军.梁端翼缘扩大型梁柱节点抗震性能和设计方法[J].哈尔滨工业大学学报,2009,41(12):16-22.ZHANG Wen-yuan,WANG Xiang-jun,ZHU Fu-jun.Sismic behavior and design method of beam-to-column connections with beam-end horizontal haunches[J].Journal of Harbin Institute of Technology,2009,41(12):16-22.
[9]张文元,朱福军.梁端翼缘扩大型钢框架梁柱节点的受力性能分析[J].建筑钢结构进展,2007,9(6):33-38.ZHANG Wen-yuan,ZHU Fu-jun.Study on the behavior of beam-to-column connections with beam-end flange haunch[J].Progress in Steel Building Structures,2007,9(6):33-38.
[10]王万祯,陈飞益,黄友钱,等.箱型柱-H型钢梁节点断裂机理及梁翼缘扩大头和长槽孔节点研究[J].工程力学,2013,30(6):197-204.WANG Wan-zhen,CHEN Fei-yi,HUANG You-qian,et al.Fracture mechanism of joint of H-style steel beam-square steel tubular column and study on joints with horizontal haunch and slot holes at beam flanges[J].Engineering Mechanics,2013,30(6):197-204.
[11]毛辉,王燕.钢框架梁翼缘扩翼型节点受力性能研究.西安建筑科技大学学报(自然科学版)[J],2010,42(1):36-41.MAO Hui,WANG Yan.Study on the mechanical properties of wildened beam flange connections of steel frame[J].Journal of Xi’an University of Architecture Technology(Natural Science Edition),2010,42(1):36-41.
[12]王万祯.结构钢开裂准则及断裂试验分析[J].工程力学,2008,25(5):27-31.WANG Wan-zhen.Crack criterion and fracture tests of structural steel[J].Engineering Mechanics,2008,26(5):27-31.
[13]WANG Wan-zhen,QIAN Xu-dong,YANG Bao-zheng.Fracture in concrete-filled square hollow section to H-section joints under low-cycle loading[J].Journal of Constructional Steel Research,2014,101(10):363-372.
[14]王万祯,王伟焘,谢光杰.隔板贯通式箱型柱-H型钢梁节点循环加载试验和破坏机理分析[J].工程力学,2015,32(4):1-10.WANG Wan-zhen,WANG Wei-tao,XIE Guang-jie.Reversed loading tests and fracture mechanism on diaphragm-through joints of steel box column and H-section steel beam[J].Engineering Mechanics,2015,32(4):1-10.
[15]FEMA-267.Interim Guidelines:Evaluation,Repair,Modification and Design of Steel Moment Frames[R].Report No.SAC-95-02,SAC Joint Venture,California,1995:35-68.