【作者】 吴波； 梁悦欢；

【Author】 Wu Bo Liang Yuehuan (State Key Laboratory of Subtropical Building Science,South China Univ.of Technology,Guangzhou 510640)

【机构】 华南理工大学亚热带建筑科学国家重点实验室；

【摘要】 引入具有不同概率水平的钢筋/混凝土相对高温强度——温度关系,在其他参数一定的情况下,通过大量计算分析,揭示了钢筋/混凝土相对高温强度的随机性对轴压柱耐火极限的影响趋势。研究结果表明:①直接选用钢筋/混凝土相对高温强度随温度变化的均值曲线进行计算,可近似得到柱耐火极限的均值;②钢筋/混凝土相对高温强度变异系数的变化范围和最大值明显大于柱耐火极限的变异系数;③钢筋相对屈服强度随温度变化的随机性对柱耐火极限影响不大,而混凝土棱柱体相对抗压强度随温度变化的随机性却对柱耐火极限影响明显;④柱耐火极限服从正态分布。更多还原

【Abstract】 Based on the relationships with different probabilistic levels between relative strengths of steel bar/concrete and high temperature,the influence of random characteristics of relative strengths of steel bar/concrete at elevated temperature on column fire resistance is examined by extensive numerical analyses.Simulation results show that:(a) the mean value of column fire resistance can be obtained through calculation using the mean curves of relative strengths of steel bar/concrete via temperature;(b) the maximum value of variance coefficients of relative strengths of steel bar/concrete at high temperature is larger than that of column fire resistance; (c) the effect of random characteristics of relative yield strength of steel bar at high temperature on column fire resistance is limited,but the influence of random characteristics of relative compressive strength of concrete at high temperature on column fire resistance is significant;and (d) column fire resistance is in accordance with the Normal-distribution.更多还原