【作者】 焦冰； 邱仓虎； 张耕源；

【Author】 Jiao Bing;Qiu Canghu;Zhang Gengyuan;China Academy of Building Research;

【机构】 中国建筑科学研究院有限公司；

【摘要】 目前《建筑钢结构防火技术规范》中对火灾下钢构件升温的计算忽略了火焰辐射的影响,可能导致大空间火灾中钢构件温度计算值偏低。本文介绍了三种考虑火焰辐射的钢构件升温历程计算方法,对既往大空间火灾试验进行数值模拟与计算,验证了三种方法的准确性,并针对不同的火灾场景与构件位置进行了对比计算分析。分析结果表明在本文的火灾场景下考虑火焰辐射的计算温度最多可比不考虑火焰辐射的计算结果增大13%,三种方法中AST原理对不同的火灾场景和构件位置具有较好的灵活性和适用性,可以计算构件沿截面的温度变化,可应用于实际工程的钢结构抗火计算。更多还原

【Abstract】 The influence of flame radiation is neglected in the calculation of temperature rise of steel members under fire in the Code for Fire Safety of Steel Structures in Buildings,which may cause the calculated temperature of steel members to be low in large space fire.This paper introduces three methods for calculating the heating process of steel members considering flame radiation,namely numerical simulation based on AST principle,Du Yong’s model and Zhang Guowei’s model.The accuracy of the three methods is verified by the numerical simulation and calculation of previous large space fire experiment,and comparative calculation and analysis of different fire scenes and member positions are carried out.Results show that the calculated temperature with flame radiation can be increased by 13% at most compared with those without flame radiation under the fire scenes of this paper.Among the three methods,AST principle has good flexibility and applicability for different fire scenes and member positions,and can calculate the temperature change of members along the section.It can be applied to the fire-resistance calculation of steel structures in practical engineering.更多还原