钢管混凝土结构是介于钢结构和钢筋混凝土结构之间的一种新型结构。它利用钢管和混凝土两种材料在受力过程中的相互制约，弥补两种材料各自的缺点，充分发挥二者的优点。使这种结构不仅具备优越的力学特性，也具有较好的耐火性能。钢管混凝土构件在高温（火灾）作用下，承载能力随温度的升高而下降。为确定钢管混凝土结构的耐火性能，必须确定高温（火灾）作用下钢管混凝土的温度场。利用ANSYS建立求解钢管混凝土温度场的有限元模型。模型理论分析结果与试验结果符合较好。%Fire is one of the most numerous and destructive disasters among all kinds of the disasters. The economic loss it brings directly is only less than drought and flood. The dimension of fire also enlarge with them, building fire-resistance arouse people more and more regard, so it is very important for people to seek for the new type of structure that strongly resisting fire. CFST （concrete filled steel tubes） is a new type structure between steel and reinforced concrete. CFST utilize the mutual restriction of material steel and concrete, and make up the shortage of them, so the virtue of the two kinds of material can be exerted. Therefore CFST not only has predominant mechanical performance but also good fire resistance. The carry- ing capacity of CFST under high temperatures （fire） will be reduced with the temperature~s raise. In order to obtain the fire resistance of CFST, the temperature field of CFST under high temperature must be deter- mined. Finite element model for the calculation of the temperature fields of concrete filled steel tubes have been set up in this paper. And a comparison between calculated results using this model and testing results has done is a good agreement.
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