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首先,在合理建立室内火灾传热模型的基础上,利用有限单元法给出了内配圆钢管的钢骨混凝土核心柱高温下温度分布的数值计算方法,并编制了有限单元法的计算程序,通过与所进行的火灾试验对比分析,验证了分析理论及计算程序的正确性;其次,在确定核心柱截面温度场分布后,通过非线性有限元方法和数值积分方法,编制了计算火灾后核心短柱剩余轴压承载力的程序;最后,通过对2根核心柱的高温后承载力试验,验证了理论计算的正确性。理论计算和试验结果都表明,内配圆钢管的钢骨混凝土核心柱在遭受火灾后承载力降幅较小且承载力曲线下降缓慢,表明其具有良好的抗火性能。
Firstly, based on the reasonably establishing heat transfer model of indoor fire, the numerical calculation method of temperature distribution of steel reinforced concrete core column with circular steel tube at high temperature is given by using finite element method, and the calculation program of finite element method is developed. Through comparing with the fire test, the analysis theory and the correctness of the calculation program are validated. Secondly, after determining the temperature field distribution of the core column section, by the nonlinear finite element method and the numerical integration method, Finally, through the test of the bearing capacity of two core columns at high temperature, the correctness of the theoretical calculation is verified. The theoretical calculation and experimental results show that the core column with round steel tube has a small decrease in bearing capacity and a slow decline in bearing capacity after fire, indicating that it has good fire resistance.