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为对已有的椭圆中空截面(EHS)钢柱性能试验进行补充,该文根据烃类火灾曲线对其进行了数值分析。基于12根EHS钢柱试验建立3D有限元分析(FEM)模型,其中6根钢柱无约束,6根钢柱受到轴向约束,钢柱包含两种长细比λz=40.1和λz=50.8。在校准过程中使用三种不同的荷载水平(αL=0.3,0.45,0.6),测得EHS的温度曲线和轴向位移。将EC3第1～2部分详细描述的高温下碳钢的材料和热力性质,应用于钢结构设计中。轴向位移曲线表明,在校准过程中强调如何判断膨胀系数和几何缺陷时,有限元分析结果和试验结果十分吻合。最后,该文将详细介绍椭圆中空截面钢柱(钢号S355J2H)的热学分析,为综合性参数性火灾研究提供平台。
In order to supplement the existing EHS steel column performance test, this paper conducts a numerical analysis based on the hydrocarbon fire curve. Based on 12 EHS steel columns, a 3D finite element analysis (FEM) model was established, in which 6 steel columns were unconstrained and 6 steel columns were axially restrained. The steel columns contained two slenderness ratios λz = 40.1 and λz = 50.8. Three different load levels (αL = 0.3, 0.45, 0.6) were used in the calibration process to measure the temperature profile and axial displacement of the EHS. The material and thermal properties of carbon steels, as described in detail in Section 1 to 2 of EC3, are used in the design of steel structures. The axial displacement curve shows that the finite element analysis is in good agreement with the experimental results when emphasizing how to determine the expansion coefficient and geometric defects during calibration. Finally, the article will introduce in detail the thermal analysis of elliptical hollow section steel columns (steel No. S355J2H), providing a platform for comprehensive parametric fire research.