穿芯高强螺栓-端板节点方钢管混凝土框架抗震性能数值分析
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摘要
为研究采用穿芯高强螺栓-端板节点的方钢管混凝土框架的抗震性能,基于一榀两层两跨方钢管混凝土框架的拟静力试验研究结果,利用有限元软件ABAQUS对试验试件进行了非线性数值分析。研究框架的破坏机制、延性、耗能能力及节点性能。在峰值荷载前,数值分析结果与试验结果吻合较好。对轴压比、节点端板厚度、加劲肋厚度以及高强螺栓预拉力等因素进行了分析。结果表明,框架滞回曲线饱满,具有良好的延性和耗能能力,节点在加载过程中未产生塑性变形。当框架柱的轴压比较小时,可形成理想的梁铰破坏机制。增大端板厚度和设置梁端加劲肋可提高结构的刚度与承载力,使框架刚度的退化趋于平缓。高强螺栓预拉力对框架性能无显著影响。
This study is based on the experimental results of a two-story two-bay composite frame under cyclic loading, built to study the seismic behavior of square concrete-filled steel tube frame with through bolt-end plate joints. The nonlinear numerical analysis was conducted using the finite element software(FES) ABAQUS to analyze the failure mechanism, ductility, energy dissipation and connection behavior of this structure. Before maximum load, reasonable agreement was observed between the analysis results and experimental ones. Considering different parameters, including axial compression ratios, the thickness of end plates, beam stiffeners, and the pre-tension of high strength bolts, the mechanical performance of frames was investigated. The results show that the hysteresis curves of the frame are stable, and the frame has excellent ductility and energy dissipation capacity. The joints have no plastic deformation during the loading procedure. When the axial compression ratio is low, the failure mechanism of frame is acceptable. Increasing the thickness of the end plates and providing beam stiffeners increase the stiffness and ultimate load, and postpone the decrease of stiffness. The pre-tensioning of high strength bolts has no influence on the behavior of frame.
This study is based on the experimental results of a two-story two-bay composite frame under cyclic loading, built to study the seismic behavior of square concrete-filled steel tube frame with through bolt-end plate joints. The nonlinear numerical analysis was conducted using the finite element software(FES) ABAQUS to analyze the failure mechanism, ductility, energy dissipation and connection behavior of this structure. Before maximum load, reasonable agreement was observed between the analysis results and experimental ones. Considering different parameters, including axial compression ratios, the thickness of end plates, beam stiffeners, and the pre-tension of high strength bolts, the mechanical performance of frames was investigated. The results show that the hysteresis curves of the frame are stable, and the frame has excellent ductility and energy dissipation capacity. The joints have no plastic deformation during the loading procedure. When the axial compression ratio is low, the failure mechanism of frame is acceptable. Increasing the thickness of the end plates and providing beam stiffeners increase the stiffness and ultimate load, and postpone the decrease of stiffness. The pre-tensioning of high strength bolts has no influence on the behavior of frame.
引文
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[2]Herrera R,Ricles J M,Sause R.Seismic Performance evaluation of a large-scale composite MRF using pseudo-dynamic testing[J].Journal of Structural Engineering,2008,134(2):279―288.
[3]Tsai K C,Weng Yuantao,Lin Minlang,et al.Pseudo-dynamic tests of a full-scale CFT/BRB frame-Part I:Specimen design,experiment and analysis[J].Earthquake Engineering&Structural Dynamics,2008,37(7):1081―1098.
[4]Cenk Tort,Jerome F,Hajjar.Mixed finite-element modeling of rectangular concrete-filled steel tube members and frames under static and dynamic loads[J].Journal of Structural Engineering,2010,36(6):654―664.
[5]聂建国,黄远,樊健生.考虑楼板组合作用的方钢管混凝土组合框架受力性能试验研究[J].建筑结构学报,2011,32(3):99―108.Nie Jianguo,Huang Yuan,Fan Jiansheng.Experimental study on load-bearing behavior of rectangular CFST frame considering composite action of floor slab[J].Journal of Building Structures,2011,32(3):99―108.(in Chinese)
[6]王文达,王军.远场地震作用下钢管混凝土组合框架的地震反应分析[J].工程力学,2012,29(增刊1):124―129.Wang Wenda,Wang Jun.Seismic response of composite frame with CFST columns under far-field ground motion[J].Engineering Mechanics,2012,29(Suppl 1):124―129.(in Chinese)
[7]安钰丰,李威.钢管混凝土柱-钢梁多层平面框架倒塌分析研究[J].工程力学,2012,29(增刊1):115―118.An Yufeng,Li Wei.Collapse analysis of concrete filled steel tubular column-steel beam planar frames[J].Engineering Mechanics,2012,29(Suppl 1):115―118.(in Chinese)
[8]王先铁,郝际平,周观根,等.方钢管混凝土柱-钢梁平面框架抗震性能试验研究[J].建筑结构学报,2010,31(8):8―14.Wang Xiantie,Hao Jiping,Zhou Guan’gen,et al.Experimental research on seismic behavior of concrete filled square steel tube columns and steel beam planar frames[J].Journal of Building Structures,2010,31(8):8―14.(in Chinese)
[9]陈曦,周德源.五种本构模型在钢管混凝土有限元中的比较[J].工程力学,2009,26(6):116―121.Chen Xi,Zhou Deyuan.Comparison among five constitutive models in finite element analyses of concrete-filled steel tube[J].Engineering Mechanics,2009,26(6):116―121.(in Chinese)
[10]刘威.钢管混凝土局部受压时的工作机理研究[D].福建:福州大学,2005.Liu Wei.Research on mechanism of concrete-filled steel tubes subjected to local compression[D].Fujian:Fuzhou University,2005.(in Chinese)
[11]韩林海.钢管混凝土结构-理论与实践[M].第二版.北京:科学出版社,2007:106.Han Linhai.Concrete filled steel tubular structure-theory and practice[M].2nd ed.Beijing:Science Press,2007:106.(in Chinese)
[12]ABAQUS Inc.ABAQUS Version 6.10 documentation[CP].Pawtuchek,RI,USA,2010.6.30.
[13]GB50017-2003,钢结构设计规范[S].北京:中国计划出版社,2003.GB50017-2003,Code for design of steel structures[S].Beijing:China Planning Press,2003.(in Chinese)
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