火灾作用下轻型钢构件(结构)温度场类相似理论研究  

RESEARCH ON THE SIMILARITY THEORY OF TEMPERATURE FIELD OF LIGHT STEEL MEMBERS(STRUCTURES)UNDER FIRE

作　　者：邱仓虎 张耕源 李白宇 仝玉 刘庆 王广勇 QIU Cang-hu;ZHANG Geng-yuan;LI Bai-yu;TONG Yu;LIU Qing;WANG Guang-yong(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013

出　　处：《工程力学》2020年第11期176-184,共9页Engineering Mechanics

基　　金：国家重点研发计划项目(2017YFC0803300);中国建筑科学研究院自筹基金科研项目(20190111330730002)。

摘　　要：基于传热学理论,对火灾作用下轻型钢构件(结构)的温度场类相似理论进行了研究,提出了简化后的实验模型炉内升温曲线表达式,并对表达式进行了数值模拟与实验验证,同时对有、无非膨胀型防火涂料保护的轻型钢构件(结构)温度场类相似理论影响因素进行了对比研究。结果表明:采用理论推导出时间相似常数为1的实验模型炉内升温曲线表达式,可使实验模型温度与ISO834标准升温曲线作用下的原型结构温度相同,即火灾作用下轻型钢构件(结构)温度场类相似理论成立;实验模型炉温与钢材密度、比热成负相关关系,与比表面积、尺寸相似常数成正相关关系,对于非膨胀型防火涂料保护的轻型钢构件(结构)来说,还与涂料热阻成负相关关系,与涂料厚度相似常数成正相关关系。Based on heat transfer theory,the similarity theory of temperature field focusing on light steel members(structures)under fire is researched,and the simplified furnace temperature curves are proposed and proved by numerical and experimental methods.Meanwhile,the factors that influence the similarity theory of temperature field focusing on light steel members(structures)with or without non-bulgy fire retardant coating are compared.The results show that the temperature of experimental models under the simplified furnace temperature curves with time similarity constant"1"s basically the same as that of prototype structures under the standard ISO834 temperature curve.This implies that the similarity theory of temperature field focusing on light steel members(structures)under fire is valid.Furnace temperature curves are negatively correlated with steel density and specific heat,and positively correlated with specific surface area and size similarity constant.For light steel members(structures)with non-bulgy fire retardant coating,they are also negatively correlated with coating thermal resistance,and positively correlated with the coating thickness similarity constant.

关 键 词：轻型钢构件 温度场类相似理论 数值模拟 火灾实验 非膨胀型防火涂料 

分 类 号：TU352.5[建筑科学—结构工程]