火灾作用下轻型钢构件结构)热-力耦合类相似理论研究
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；
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[2] MCGUIRE J H.The scaling of dimensions in heat conduction problems[R].Boreham Wood:Fire Research Station,1954.
[3] MCGUIRE J H.The scaling of dimensions in BS 476 fire-resistance tests[R].Boreham Wood:Fire Research Station,1954.
[4] MCGUIRE J H,STANZAK W W,LAW M.The scaling of fire resistance problems[J].Fire Technology,1975,11(3):191-205.
[5] O'CONNOR D J,SILCOCK G W H.A strategy for the fire testing of reduced scale structural models[J].Fire Technology,1992,28(1):48-69.
[6] O'CONNOR D J,SILCOCK G W H,MORRIS B.Furnace heat transfer processes applied to a strategy for the fire testing of reduced scale structural models[J].Fire Safety Journal,1996,27(1):1-22.
[7] REDDY D V,SOBHAN K,LIU L X,et al.Size effect on fire resistance of structural concrete[J].Engineering Structures,2015,99:468-478.
[8] 陈适才，王尚则，王亚辉，等.钢结构火灾反应相似模型及试验研究与分析[J].工程力学，2019,36(8):79-86,105.
[9] 邱仓虎，张耕源，李白宇，等.火灾作用下轻型钢构件(结构)温度场类相似理论研究[J].工程力学，2020,37(11):176-184.
[10] 姚振刚，刘祖华.建筑结构试验[M].上海：同济大学出版社，1996.
[11] 范钦珊.材料力学[M].北京：高等教育出版社，2000.
[12] 龙驭球，包世华，匡文起，等.结构力学[M].北京：高等教育出版社，2006.
[13] 钢结构防火涂料：GB 14907—2002[S].北京：中国标准出版社，2002.
[14] LIE T T,CHABOT M.A method to predict the fire resistance of circular concrete filled hollow steel columns[J].Journal of Fire Engineering,1990,2(4):111-126.
[15] LIE T T.Fire resistance of circular steel columns filled with bar-reinforced concrete[J].Journal of Structural Engineering,1994,120(5):1489-1509.
[16] 钢结构设计规范：GB 50017—2017[S].北京：中国建筑工业出版社，2018.
[17] 建筑构件耐火试验方法第1部分：通用要求：GB/T 9978.1—2008[S].北京：中国标准出版社，2008.
Research on quasi-similarity theory of thermo-mechanical coupling of light steel members(structures) under fire
Abstract: Based on the similarity theory of structural static test and quasi-similarity theory of temperature field, the study was conducted on the quasi-similarity theory of thermo-mechanical coupling of light steel members(structures). The theory was validated by comparing and analyzing the fire resistance limits of prototype structures and the fire resistance time of scaled models of steel columns, steel beams, and steel frames. The results show that by combining the similarity theory of structural static test and quasi-similarity theory of temperature field, the fire resistance time of the scaled model can be made identical to the fire resistance limit of the prototype structure under the ISO834 standard temperature rise curve, thus proving the validity of the quasi-similarity theory of thermo-mechanical coupling of light steel members(structures) under fire. When the influence of the model's own weight on the load cannot be ignored, it is possible to compensate for the insufficient 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 retardant coating; numerical simulation; fire resistance limit
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