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当钢柱三面受火时,沿截面方向会产生温度不均匀分布的现象。而现行规范假设各种受火情况下钢柱沿截面方向的温度分布均匀,并以此为前提提出了钢构件温度的计算公式。研究了受厚型防火涂料保护的钢柱在三面受火条件下截面温度的分布规律,利用有限元软件ABAQUS进行参数分析,参数分析的变量主要为截面形状系数,通过改变截面高度和腹板厚实现对截面形状系数的影响。通过对EC3中采用的受保护钢构件受火升温公式进行修正,建立了截面不同部位升温的计算方法,并给出沿截面不同温度分布曲线的计算公式。
When the steel column on three sides by the fire, along the cross-sectional direction will produce uneven temperature distribution phenomenon. However, the existing code assumes that the temperature distribution of the steel columns along the cross-section direction under various fire conditions is uniform, and based on this, the formula for calculating the temperature of steel components is proposed. The distribution law of the section temperature of steel columns protected by thick fire retardant coating under three fire conditions was studied. The parameters were analyzed by the finite element software ABAQUS. The variables of the parameter analysis were mainly the cross-sectional shape coefficients. By changing the section height and web thickness The realization of the cross-sectional shape coefficient. Through the correction of the fire-heating formula of the protected steel members used in EC3, the calculation method of temperature rise in different parts of the cross-section was established and the formulas for calculating the temperature distribution curves along the cross-section were given.