单层带支撑异形柱框架的高温性能研究
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摘要
针对单层异形柱框架,通过高温数值分析,考察了支撑设置和受火位置对结构高温变形及内力的影响。研究结果表明:对于单层多跨异形柱框架,当只有一端有支撑跨时,会在一定程度上增大另一端的边节点水平位移和边柱侧向变形,对结构整体抗火不利;当左、右两端均有支撑跨时,非支撑跨在火灾作用下的梁轴力比很大,升温后期可能因梁跨中竖向位移急剧增大而发生破坏。基于上述研究结果,给出了4类单层带支撑异形柱框架火灾行为的初步判定方法。
The influences of brace and fire locations on deformations and internal forces of single-story RC frames with specially shaped columns at high temperature are investigated.Simulation results show that: In the case that braces are located at one side of a single-story multi-span frame,the lateral deformation of the opposite side column increases,this is disadvantageous for structural fire resistance;In the case that braces are located at both left and right end-spans of a single-story multi-span frame,the axial force ratios of beams in nonbracing spans subjected to fire are large,which may lead to collapse of these beams at the late heating time.At the end,an assessment method is proposed for fire behaviors of four kinds of single-story frames with braces and specially shaped columns.
The influences of brace and fire locations on deformations and internal forces of single-story RC frames with specially shaped columns at high temperature are investigated.Simulation results show that: In the case that braces are located at one side of a single-story multi-span frame,the lateral deformation of the opposite side column increases,this is disadvantageous for structural fire resistance;In the case that braces are located at both left and right end-spans of a single-story multi-span frame,the axial force ratios of beams in nonbracing spans subjected to fire are large,which may lead to collapse of these beams at the late heating time.At the end,an assessment method is proposed for fire behaviors of four kinds of single-story frames with braces and specially shaped columns.
引文
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[7]石晓蕊,邓秀泰,李天.异型柱斜撑框架结构模型振动台试验及建模[J].郑州工业大学学报,1999,20(2):83-85.Shi X R,Deng X T,Li T.Shaking table test andmodel establishment of reinforced concrete framemodel with hetero-columns and diagonal braces[J].Journal of Zhengzhou University of Technology,1999,20(2):83-85.
[8]杨玉成,黄浩华,孙景江,等.七层钢筋混凝土异型柱支撑框架结构模型振动台试验研究[J].地震工程与工程振动,1995,15(1):53-66.Yang Y C,Huang H H,Sun J J,et al.Shaking tabletest study of RC frame model with hetero-columnsand diagonal braces[J].Earthquake Engineering andEngineering Vibration,1995,15(1):53-66.
[9]British Standards Institution BSI.Eurocode 2:Designof concrete structures.General rules and rules forbuildings[S].BS EN 1992-1.1,2004,London.
[10]British Standards Institution BSI.Eurocode 3:Designof steel structures.General Rules and Rules for Build-ings[S].BS EN 1993-1.1,2005,London.
[11]荆亚涛,吴波.不同受火方式下混凝土框架结构的变形研究[J].防灾减灾工程学报,2009,29(4):392-398.Jing Y T,Wu B.Deformations of RC frames subject-ed to different fire exposure cases[J].Journal ofDisaster Prevention and Mitigation Engineering,2009,29(4):392-398.
[2]曹万林,刘建民,王东增.异型柱框架结构底层支撑合理设置研究[J].地震工程与工程振动,1997,17(1):76-81.Cao W L,Liu J M,Wang D Z.The reasonable instal-lation of the first storey bracings for frame structureswith special-shaped columns[J].Earthquake Engi-neering and Engineering Vibration,1997,17(1):76-81.
[3]曹万林,王光远,魏文湘,等.底层带支撑异型柱框架抗震分析初探[J].地震工程与工程振动,1995,15(2):62-74.Cao W L,Wang G Y,Wei W X,et al.Explorationon the aseismic study of the frame with special-shapedcolumns and bracings in the first storey[J].Earth-quake Engineering and Engineering Vibration,1995,15(2):62-74
[4]曹万林,王光远,魏文湘,等.关于两阶段分析底层带支撑异型柱框架延性的问题[J].哈尔滨建筑大学学报,1995,28(6):1-7.Cao W L,Wang G Y,Wei W X,et al.Study on two-stage analysing of the ductility of frame with special-shape columns and bracings in the first story[J].Journal of Harbin University of Architecture and En-gineering,1995,28(6):1-7.
[5]曹万林,桓伟,王宝营,等.合理确定异型柱框架层刚度的研究[J].世界地震工程,1997,13(3):55-60.Cao W L,Huan W,Wang B Y,et al.Research onrationally determining the story-rigidity of frame withspecial-shaped columns[J].World Earthquake Engi-neering,1997,13(3):55-60.
[6]陆新征,江见鲸.利用斜支撑提高异型柱框架结构抗扭性能的研究[J].工业建筑,2002,32(6):39-42.Lu X Z,Jiang J J.Studies on improving the torsionresistance ability of special shape column frames usinginclined supports[J].Industrial Construction,2002,32(6):39-42.
[7]石晓蕊,邓秀泰,李天.异型柱斜撑框架结构模型振动台试验及建模[J].郑州工业大学学报,1999,20(2):83-85.Shi X R,Deng X T,Li T.Shaking table test andmodel establishment of reinforced concrete framemodel with hetero-columns and diagonal braces[J].Journal of Zhengzhou University of Technology,1999,20(2):83-85.
[8]杨玉成,黄浩华,孙景江,等.七层钢筋混凝土异型柱支撑框架结构模型振动台试验研究[J].地震工程与工程振动,1995,15(1):53-66.Yang Y C,Huang H H,Sun J J,et al.Shaking tabletest study of RC frame model with hetero-columnsand diagonal braces[J].Earthquake Engineering andEngineering Vibration,1995,15(1):53-66.
[9]British Standards Institution BSI.Eurocode 2:Designof concrete structures.General rules and rules forbuildings[S].BS EN 1992-1.1,2004,London.
[10]British Standards Institution BSI.Eurocode 3:Designof steel structures.General Rules and Rules for Build-ings[S].BS EN 1993-1.1,2005,London.
[11]荆亚涛,吴波.不同受火方式下混凝土框架结构的变形研究[J].防灾减灾工程学报,2009,29(4):392-398.Jing Y T,Wu B.Deformations of RC frames subject-ed to different fire exposure cases[J].Journal ofDisaster Prevention and Mitigation Engineering,2009,29(4):392-398.
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