(1 中国建筑科学研究院有限公司, 北京 100013; 2 杭州市会展新城开发建设有限公司, 杭州311200; 3 安徽理工大学土木建筑学院, 淮南 232001)

摘要: 基于结构静力试验相似理论与温度场类相似理论,对轻型钢构件(结构)的热-力耦合类相似理论进行了研究. 并通过钢柱、钢梁和钢框架的原型结构耐火极限与缩尺模型的耐火时间对比分析,对该理论进行了验证. 结果表明:结合结构静力试验相似理论与温度场类相似理论,可使缩尺模型的耐火时间与 ISO834 标准升温曲线作用下原型结构的耐火极限相同,即火灾作用下轻型钢构件(结构)热-力耦合类相似理论成立. 当模型自重对荷载的影响不可忽略时,可通过人工附加配重的方法来弥补缩尺模型材料容重的不足.

关键词: 轻型钢构件(结构); 热-力耦合类相似理论; 非膨胀型防火涂料; 数值模拟; 耐火极限

中图分类号:TU398. 5 文献标志码:A 文章编号:1002-848X(2023)12-0007-08

DOI:10. 19701 / j. jzjg. 20201485

Research on quasi-similarity theory of thermo-mechanical coupling of light steel members(structures) under fire

ZHANG Gengyuan1, CHEN Xiao2, QIU Canghu1, JIAO Bing1, WANG Guangyong1,ZHANG Wei1, SHI Yanyan1, CAO Bo3

(1 China Academy of Building Research, Beijing 100013, China; 2 Hangzhou Convention and Exhibition of New CenturyCity Development and Construction Co. , Ltd. , Hangzhou 311200, China; 3 School of Civil Engineering and Architecture,Anhui University of Science and Technology, Huainan 232001, China)

Abstract: Based on the similarity theory of structural static test and quasi-similarity theory of temperature field, the studywas conducted on the quasi-similarity theory of thermo-mechanical coupling of light steel members (structures). The theorywas validated by comparing and analyzing the fire resistance limits of prototype structures and the fire resistance time ofscaled models of steel columns, steel beams, and steel frames. The results show that by combining the similarity theory ofstructural static test and quasi-similarity theory of temperature field, the fire resistance time of the scaled model can bemade identical to the fire resistance limit of the prototype structure under the ISO834 standard temperature rise curve, thusproving the validity of the quasi-similarity theory of thermo-mechanical coupling of light steel members ( structures) underfire. When the influence of the model's own weight on the load cannot be ignored, it is possible to compensate for theinsufficient material density of the scaled model by artificially adding additional weights.

Keywords:light steel member (structure); quasi-similarity theory of thermo-mechanical coupling; non-bulgy fire retardantcoating; numerical simulation; fire resistance limit

∗中国建筑科学研究院自筹基金科研项目(20190111330730002),国家重点研发计划(2017YFC0803300).

第一作者:张耕源,硕士,工程师,主要从事建筑结构、建筑防火研究,Email: zhagy10@ 126. com.

[引用本文] 张耕源,陈骁,邱仓虎,等. 火灾作用下轻型钢构件(结构)热-力耦合类相似理论研究[J]. 建筑结构,2023,53(12):7-14,29. ZHANG Gengyuan,CHEN Xiao,QIU Canghu,et al. Research on quasi-similarity theory of thermomechanical coupling of light steel members (structures) under fire[J]. Building Structure,2023,53(12):7-14,29.