多国钢结构抗火规范关于受弯构件计算方法的比较与分析

为了研究受弯构件的抗火性能,及对国内外目前的受弯构件抗火设计方法有一个系统的了解,介绍了中国、美国、欧洲、英国和澳大利亚的钢结构抗火设计规范关于受弯构件的计算方法,并对它们的区别和联系进行了分析。设计了一个算例,分别采用不同的规范计算了其临界温度和耐火极限。经对比分析表明:各国规范的计算结果差别较大,相同条件下,澳大利亚规范计算得出的临界温度较低;无防火保护层时,英国规范计算得出的耐火极限较高,而有保护层时,美国规范计算得出的耐火极限较低。

Comparison and Analysis on Standard Methods for Fire Resistance Design of Flexural Members in Different Countries

In order to investigate the fire resistance of flexural members,the standard design methods in China,America,Europe,Britain and Australia are introduced for systematically understanding the existing fire resistance design methods in different countries.Their difference and relationship are compared and discussed.An example was designed and the critical temperature and fire duration of the flexural member were computed using different methods.It is suggest that the results obtained by different methods have great differences even in the same conditions.The critical temperature obtained by Australia standard method is lower than that obtained by others.The fire duration obtained by British standard method is the highest for unprotected steel members,and that obtained by American standard method is the lowest for protected steel members.