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中文摘要：
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。
英文摘要：
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,wben 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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