低周反复荷载下蜂窝式钢框架梁柱节点性能试验研究
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摘要
为研究蜂窝式钢框架梁柱节点的抗震性能,进行6榀框架边节点的低周反复荷载试验。当轴压比u=0.25和扩张比K=1.5时,在考虑梁上第一个开孔位置与其腹板高度之比d/ht和柱上第一个开孔位置与其腹板高度之比e/hc等控制参数的影响下,对其节点的受力过程、破坏模式、滞回曲线、骨架曲线、延性性能等因素进行研究与分析。研究表明:焊接质量是防止节点脆性破坏的首要保证。明显的焊接缺陷容易导致裂缝过早扩展,从而降低节点延性和耗能能力;与原型钢相比,梁柱腹板开孔扩高后,节点受弯承载力和转动刚度均有较大程度提高,梁端荷载-位移关系的滞回曲线饱满、稳定,刚度退化不明显,具有较好的耗能能力;扩张比一定的情况下,d/ht对节点抗震性能的影响要比e/hc显著,并且控制d/ht可以有效地将塑性铰外移到距节点域较远的梁截面上,大大缓解节点处的高三轴应力状态,降低连接焊缝发生脆性破坏的可能性,改善节点延性性能。
Six edge connections of cellular steel frames(CSF) were tested under low-cyclic reversed loading in order to study the seismic behavior of welded beam-column connection of CSF.The effects of the parameters such as d/ht(ratio of the first opening position on the beam and height of beam web) and e/hc(ratio of the first opening position on the column and height of column web) were considered.The loading process,failure mode,hysteretic loop,skeleton curve,ductility and stiffness degradation of the connections of CSF were analyzed under axial compression ratio u=0.25 and outspread ratio K=1.5.It is indicated that welding quality is the primary assurance to prevent brittle failure of the connections.Welding flaws lead to early crack propagation,which can reduce the ductility and energy dissipation capacity of the connections.Comparing with the original connection without holes on beam-column web,the moment resistance capacity and rotational stiffness of the connections were improved after hole-opening and outspreading of beam-column web.Hysteretic loops of the load-displacement curves were stable and plump.No obvious stiffness degradation was observed.It is demonstrated that the connections of CSF had good energy dissipation capacity.When outspread ratio remains constant,the seismic behavior is influenced by d/ht more significantly than e/hc.Controlling d/ht can effectively change the plastic hinge to the beam section far away from the connection domain.In this way,the triaxial stress state close to the connection zone can be greatly alleviated,possibility of brittle damage of the welding is dramatically reduced,and the ductility performance of the connection is greatly improved.
Six edge connections of cellular steel frames(CSF) were tested under low-cyclic reversed loading in order to study the seismic behavior of welded beam-column connection of CSF.The effects of the parameters such as d/ht(ratio of the first opening position on the beam and height of beam web) and e/hc(ratio of the first opening position on the column and height of column web) were considered.The loading process,failure mode,hysteretic loop,skeleton curve,ductility and stiffness degradation of the connections of CSF were analyzed under axial compression ratio u=0.25 and outspread ratio K=1.5.It is indicated that welding quality is the primary assurance to prevent brittle failure of the connections.Welding flaws lead to early crack propagation,which can reduce the ductility and energy dissipation capacity of the connections.Comparing with the original connection without holes on beam-column web,the moment resistance capacity and rotational stiffness of the connections were improved after hole-opening and outspreading of beam-column web.Hysteretic loops of the load-displacement curves were stable and plump.No obvious stiffness degradation was observed.It is demonstrated that the connections of CSF had good energy dissipation capacity.When outspread ratio remains constant,the seismic behavior is influenced by d/ht more significantly than e/hc.Controlling d/ht can effectively change the plastic hinge to the beam section far away from the connection domain.In this way,the triaxial stress state close to the connection zone can be greatly alleviated,possibility of brittle damage of the welding is dramatically reduced,and the ductility performance of the connection is greatly improved.
引文
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[10]贾连光,张绍武,董富军,等.利用柱腹板屈曲后强度的钢框架节点板域抗震性能试验研究[J].地震工程与工程振动,2002,22(4):85-89(Jia Lianguang,ZhangShaowu,Dong Fujun,et al.Experimental study onaseismatic property of steel frame joints utilizing post-buckling strength of column web[J].EarthquakeEngineering and Engineering Vibration,2002,22(4):85-89(in Chinese))
[11]贾连光,许峰,张绍武,等.轻型钢框架结构的抗震性能试验研究[J].工业建筑,2005,35(10):64-68(JiaLianguang,Xu Feng,Zhang Shaowu,et al.Experimentalstudy on aseismatic property of lightweight steel frame[J].Industrial Construction,2005,35(10):64-68(inChinese))
[12]戴绍斌,黄俊,朱健.翼缘削弱型刚性连接节点的受力性能研究[J].华中科技大学学报:城市科学版,2005,22(3):18-20,24(Dai Shaobin,Huang Jun,Zhu Jian.Mechanical performance of flange weakening type rigidconnection joint[J].Journal of Huazhong University ofScience and Technology:Urban Science Edition,2005,22(3):18-20,24(in Chinese))
[13]陆铁坚,贺子瑛,余志武,等.钢-混凝土组合梁与混凝土柱节点的抗震性能试验研究[J].建筑结构学报,2008,29(1):70-74(Lu Tiejian,He Ziying,Yu Zhiwu,etal.Experimental research on seismic behavior of SC beamto RC column connection[J].Journal of BuildingStructures,2008,29(1):70-74(in Chinese))
[14]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997(JGJ 101—1996 Specification oftesting methods for earthquake resistant building[S].Beijing:China Architecture&Building Press,1997(inChinese))
[15]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989
[2]Popov E P,Yang T S,Chang S P.Design of steel MRFconnections before and after 1994 Northridge earthquake[J].Engineering Structures,1998,20(12):1030-1038
[3]Jaspart J P.General report:session on connections[J].Journal of Constructional Steel Research,2000,55(1/2/3):69-89
[4]苏益声.圆形孔与多边形孔蜂窝钢梁的试验分析[J].广西大学学报:自然科学版,2003,28(1):5-9(SuYisheng.The experiment and analysis of the circular andpolygon holes’honeycombed steel beams[J].Journal ofGuangxi University:Natural Science Edition,2003,28(1):5-9(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):45-50(Yang Qingshan.Aseismic connection of steel moment-resisting frame withopening on beam web[J].China Safety Science Journal,2005,15(2):45-50(in Chinese))
[6]FEMA-267A.Interim guideline:advisory No.1,supplementto FEMA-267[R].Sacramento,Calif:SAC JointVenture,1997
[7]石永久,李兆凡,陈宏,等.高层钢框架新型梁柱节点抗震性能试验研究[J].建筑结构学报,2002,23(3):2-7(Shi Yongjiu,Li Zhaofan,Chen Hong,et al.Experimental research on cyclic behavior of new types ofbeam-column connections in highrise steel frames[J].Journal of Building Structures,2002,23(3):2-7(inChinese))
[8]姚国春,霍立兴,张玉凤,等.焊接钢结构梁柱节点地震下的断裂行为研究[J].钢结构,2000,15(4):25-27(Yao Guochun,Huo Lixing,Zhang Yufeng,et al.Investigation on fracture behavior of welded steel structurebeam-column connections under earthquakes[J].SteelConstruction,2000,15(4):25-27(in Chinese))
[9]陈宏,石永久,王元清,等.钢框架梁柱节点受力性能的非线性分析[J].工业建筑,2001,31(5):56-58(ChenHong,Shi Yongjiu,Wang Yuanqing,et al.Research onstressing properties of steel beam-column connections bynonlinear analysis[J].Industrial Construction,2001,31(5):56-58(in Chinese))
[10]贾连光,张绍武,董富军,等.利用柱腹板屈曲后强度的钢框架节点板域抗震性能试验研究[J].地震工程与工程振动,2002,22(4):85-89(Jia Lianguang,ZhangShaowu,Dong Fujun,et al.Experimental study onaseismatic property of steel frame joints utilizing post-buckling strength of column web[J].EarthquakeEngineering and Engineering Vibration,2002,22(4):85-89(in Chinese))
[11]贾连光,许峰,张绍武,等.轻型钢框架结构的抗震性能试验研究[J].工业建筑,2005,35(10):64-68(JiaLianguang,Xu Feng,Zhang Shaowu,et al.Experimentalstudy on aseismatic property of lightweight steel frame[J].Industrial Construction,2005,35(10):64-68(inChinese))
[12]戴绍斌,黄俊,朱健.翼缘削弱型刚性连接节点的受力性能研究[J].华中科技大学学报:城市科学版,2005,22(3):18-20,24(Dai Shaobin,Huang Jun,Zhu Jian.Mechanical performance of flange weakening type rigidconnection joint[J].Journal of Huazhong University ofScience and Technology:Urban Science Edition,2005,22(3):18-20,24(in Chinese))
[13]陆铁坚,贺子瑛,余志武,等.钢-混凝土组合梁与混凝土柱节点的抗震性能试验研究[J].建筑结构学报,2008,29(1):70-74(Lu Tiejian,He Ziying,Yu Zhiwu,etal.Experimental research on seismic behavior of SC beamto RC column connection[J].Journal of BuildingStructures,2008,29(1):70-74(in Chinese))
[14]JGJ101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997(JGJ 101—1996 Specification oftesting methods for earthquake resistant building[S].Beijing:China Architecture&Building Press,1997(inChinese))
[15]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989
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