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FE ANALYSIS OF CIRCULAR CFST COLUMNS IN FIRE
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摘要: 钢管混凝土组合柱在实际工程应用中有其优良的工作和施工性能。火灾发生时，由于核心混凝土的吸热作用，延缓了钢管的升温，很大程度上提高了钢管混凝土柱的耐火极限。在已有模型的基础上，对圆形截面核心混凝土高温下的材料模型进行了修正，基于ABAQUS大型有限元平台建立了圆形截面钢管混凝土柱的有限元模型，并利用其模型进行了耐火极限的计算，有限元计算结果与国内外相关的试验数据进行了对比，验证了有限元模型的正确性，并对其火灾下轴向变形-受火时间的全过程进行了分析。可在此基础上进一步开展钢管混凝土抗火相关的研究工作。Abstract: CFST(concrete-filled steel tubular) columns are widely used in practical engineering for its excellent working performance.The core concrete can absorb lots of heat,when outer steel tube is exposed to fire(high temperature),making the temperature of the tube increase more slowly than a single steel tube.So CFST columns have a higher fire resistance than that of bare steel columns.Based on the present material models at elevated temperature,a suitable core concrete material model was modified.A finite element model of circular CFST column was established using ABAQUS software to calculate the fire resistance and the axial displacement vs.time curves.A comparison of the fire resistance between the calculated results and experimental data was discussed,and mechanical behavior analysis of CCFST columns was also performed.Using the method mentioned above,further studies on fire behavior of CFST structures can be performed.
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Key words:
- fire /
- material model /
- FEA /
- concrete filled steel tubular column /
- fire resistance /
- ABAQUS
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[2] Lie T T,Chabot M.Experimental Studies on the Fire Resistance ofHollowSteel Columns Filled with Plain Concrete[R].NRC-CNRCInternal Report,No.611,Ottawa:Canda,1992; Lie T T.Fire Resistance of Circular Steel Columns Filled with Bar-Reinforced Concrete[J].Journal of Structural Engineering,ASCE,1994,120(5):1489-1509; [3] Lie TT,Chabot M.AMethodto Predictthe Fire Resistance of CircularConcrete Filled HollowSteel Columns[J].Journal of Fire ProtectionEngineering,1990,2(4):111-126; [4] 韩林海.钢管混凝土结构--理论与实践[M].2版.北京:科学出版社,2007; [5] 过镇海,时旭东.钢筋混凝土的高温性能及其计算[M].北京:清华大学出版社,2003; [7] 南建林,过镇海,时旭东.混凝土的温度-应力耦合本构关系[J].清华大学学报,1997,37(6):87-90; [6] 胡海涛.高温时高强混凝土强度和变形的试验研究[D].西安:西安建筑科技大学,2002; [8] 李华东.高温下钢筋混凝土压弯构件的试验研究[D].北京:清华大学,1994; [9] 胡海涛,董毓利.高温时高强混凝土强度和变形的试验研究[J].土木工程学报,2002,35(6):44-47; [11] 李卫,过镇海.高温下混凝土的温度和变形性能试验研究[J].建筑结构学报,1993,14(1):8-16; [10] 杨华.火灾作用下(后)钢管混凝土柱力学性能研究[D].哈尔滨:哈尔滨工业大学,2003; [12] 李国强,韩林海,楼国彪,等.钢结构及钢-混凝土组合结构抗火设计[M].北京:中国建筑工业出版社,2006; [13] Vecchio FJ,Collins MP.The Modified Compression-Field Theory forReinforced Concrete Elements Subjected to Shear[J].ACI Journal,Proceeding,1986,83(2):219-231; [14] 沈聚敏,王传志,江见鲸.钢筋混凝土有限元与板壳分析[M].北京:清华大学出版社,1993; [15] 王卫华,陶忠.钢管混凝土平面框架温度场有限元分析[J].工业建筑,2007,37(12):39-42; [16] 冯九斌.钢管高强混凝土柱耐火性能研究[D].哈尔滨:哈尔滨工业大学,2001. -
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