大空间单跨门式刚架结构抗火性能影响因素的客观权重研究

火灾时的大空间单跨门式刚架结构抗火性能,受钢构件温升和结构整体抗火临界温度的影响.本文通过对无保护大空间建筑钢构件温升数据的统计分析,获得包含火源功率、建筑体积、钢构件截面形状系数的钢构件温升拟合公式；结合单跨门式刚架结构整体抗火临界温度数据的统计分析,获得包含荷载比、柱高和系数K的结构整体抗火临界温度拟合公式；通过分...

Study on Objective Weight of Fire Resistance Factors of Large-Space Single-Span Steel Portal Frame Structures

Fire resistance behavior of large-space single-span portal frame structures is influenced by steel components temperature rise and fire-resistance critical temperature of whole structure.Based on statistic analysis of temperature rise data of non-protected large-space structure steel components,we got a temperature rise fitting formula of steel component considering fire source power,building volume,cross-section shape coefficient of steel component.Combining with the statistic analysis of the whole structural fire-resistant critical temperatures data of single span steel portal frames,we got an another whole structural fire-resistance critical temperature fitting formula considering loading rate,column high and coefficient K.Through the analysis of influence of above factors on the temperature gradient of steel components and fire-resistant critical temperature change rate,we obtained objective weights of different factors,and used them for some specific cases.Results show that loading rate is the most important factor with a maximum weight about 0.4.Fire source power is the second important factor.When the building volume,cross-section shape coefficient and coefficient K are small,their weight values are great,their weight values decrease with increases of themselves.This study offers a support to fire risk assessment of non-protected portal frame structural buildings and give a reference to fire-resistance design and fire control management.