Flexural behaviour of beams made of cold-formed steel sigma-shaped sections at ambient and fire conditions
Flexural behaviour of beams made of cold-formed steel sigma-shaped sections at ambient and fire conditions
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冷弯型钢西格玛型材梁在环境和火灾条件下的弯曲性能
DOI：
10.1016/j.tws.2014.11.004
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发表时间：
2015
影响因子：
6.4
通讯作者：
H. Craveiro
中科院分区：
文献类型：
--
作者：
L. Laím;J. Rodrigues;H. Craveiro
本文报道了由一个或两个σ形型材制成的简支冷弯型钢梁在环境和火灾条件下的一系列弯曲试验。分析了在无约束、部分轴向约束和梁支座转动约束等不同约束条件下梁的临界温度、临界时间以及加劲肋对梁的影响。结果表明，不同截面形状的腹板加劲梁在火灾下会产生不同的结构响应。无腹板加劲肋和无轴向约束的梁在火灾条件下表现出最好的结构性能。
This article reports a series of flexural tests at ambient and fire conditions on simply supported cold-formed steel beams made of one or two sigma-shaped profiles. It was assessed the critical temperature and time as well as the effect of the stiffeners on the beams under different restraining conditions, including no restraints, partial axial and beam supports rotational thermal restraints. The results showed that beams with web stiffeners may have different structural response in fire depending on the section shape. The beams without web stiffeners and not axially restrained presented the best structural behaviour under fire conditions.