中文摘要：

利用数值模拟程序RCSSCF, 分析了荷载比、柱计算长度、截面尺寸、荷载偏心率、配筋率和荷载角等参数对ISO834标准升温过程作用下钢筋混凝土等肢L形柱耐火极限的影响规律.针对不同荷载比、柱计算长度、截面尺寸、荷载偏心率、配筋率和荷载角共5 400种工况进行了四周受火时钢筋混凝土等肢L形柱的高温反应分析.在此基础上,定量给出了该类构件耐火极限的实用计算方法.研究结果表明：荷载角对L形柱耐火极限的影响较大,且影响规律较为复杂;严格控制荷载比是提高L形柱耐火极限的有效措施.

英文摘要：

Analyzed in this paper were the influences of several parameters, such as the load ratio, the effective column length, the sectional dimensions, the load eccentricity ratio, the reinforcement ratio and the loading angle on the fire resistance of reinforced concrete columns with L-shaped cross section exposed to the ISO834 standard fire, and 5 400 columns subjected to fire in all sides were used to carry out the fire response analyses, with the above-mentioned parameters being the variables. Based on the analytical results, a practical method to calculate the fire resistance of the column with L-shaped cross section was presented. The results show that the loading angle has significant and complicated effect on the fire resistance of the column, and that reducing the load ratio is an effective method to improve the fire resistance.