矩形钢管混凝土柱的耐火性能和抗火设计方法  

Fire performance and design method of concrete-filled steel rectangular hollow section columns

作　　者：杨有福[1] 韩林海[1] 

机构地区：[1]福州大学土木建筑工程学院,福建福州350002

出　　处：《建筑结构学报》2004年第1期25-35,共11页Journal of Building Structures

基　　金：福建省自然科学基金重点项目(E0120001);福建省青年科技人才创新项目资金资助(2003J014)。

摘　　要：进行了8个轴心受压或偏心受压矩形钢管混凝土柱,按ISO—834和GB/T9978—1999规定的标准升温曲线升温作用下耐火极限的实验研究。实验结果表明,截面尺寸和防火保护层厚度对构件耐火极限的影响较大,而荷载偏心率的影响则相对较小。分析结果还表明,国家规范GB50045—95中钢结构柱防火保护层厚度的确定方法不适合于矩形钢管混凝土柱。在大规模参数分析结果的基础上,提出了矩形钢管混凝土柱耐火极限及防火保护层厚度的简化计算公式,公式的计算结果与数值计算结果和实验结果均吻合较好,且总体上偏于安全。本文的研究成果可为有关矩形钢管混凝土工程进行抗火设计时提供参考。Eight concrete filled steel rectangular hollow section columns with or without fire protection subjected to axial or eccentric loads under standard fire curve (ISO—834 and GB/T9978—1999) had been experimentally investigated and the results were presented in this paper. The experimental results showed that the sectional dimension and the fire protection thickness had a significant influence on the fire resistance time of rectangular composite columns, however, the load eccentricity ratio had moderate influence on the fire resistance time, and the fire protection thickness determination methods for pure steel structure columns in GB50045—95 were unsuitable for the composite columns. Based on the parametric analysis, the simplified formulas for the calculation of the fire resistance time and the fire protection thickness of the composite columns are put forward, the calculating results are in good agreement with the numerical and experimental results, and tend to safety in general. The achievements in this paper may be referenced for the fire protection design of practical engineering with concrete filled steel rectangular hollow section columns.

关 键 词：钢管混凝土 矩形空心截面 组合柱 耐火极限 抗火设计 

分 类 号：TU398.9[建筑科学—结构工程]