Experimental study of structural fire behaviour of steel beam to concrete filled tubular column assemblies with different types of joints
Experimental study of structural fire behaviour of steel beam to concrete filled tubular column assemblies with different types of joints
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DOI：
10.1016/j.engstruct.2007.08.018
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发表时间：
2007-12
影响因子：
5.5
通讯作者：
J. Ding;Yong C. Wang
中科院分区：
文献类型：
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作者：
J. Ding;Yong C. Wang
本文介绍了钢梁-钢管混凝土柱不同节点的抗火性能试验结果。节点类型包括翅片板、端板、反向槽和T形短柱。结构组件的形式是一个“橄榄球门柱”。在每次测试中，将载荷施加到梁上，然后将结构组件暴露在熔炉中的标准火灾条件下，同时保持施加的载荷。总共进行了10次测试。在10个测试中的8个中，火灾暴露持续到火灾测试终止，这主要是由于当梁明显处于实质性悬链线作用时，在张力下接头的结构失效引起的。在另外两个试验中（一个使用翅片板，一个使用反向通道），当梁接近纯弯曲状态并即将进入悬链线作用时，停止火灾暴露并开始强制冷却。实验结果表明，即使是在这项研究中使用的相对简单的接头能够允许梁发展大量的悬链线行动，使最终的故障时间和梁的温度的组件是远远高于通过假设梁在纯弯曲。在试验结束时，梁达到非常高的挠度（约跨度/5），即使这样，组件的故障总是发生在接头。因此，为了使梁在悬链线作用下充分发挥其潜力，接头应更加坚固。结果还表明，反向通道连接有潜力发展成为一个强大的连接，其特点是高刚度，强度，旋转能力和延性。两个冷却试验中的梁产生了高张力，但组件中没有结构失效。本文的主要目的是目前的联合行为在火灾中的实验结果（到目前为止是缺乏的），使更好地理解和合理的设计方法的发展，强大的建设的关节，以抵御极端的火灾攻击。
This paper presents experimental results of structural fire behaviour of steel beam to concrete filled tubular (CFT) column assemblies using different types of joints. The joint types include fin plate, end plate, reverse channel and T-stub. The structural assembly was in the form of a “rugby goalpost”. In each test, loads were applied to the beam and then the structural assembly was exposed to the standard fire condition in a furnace while maintaining the applied loads. In total, 10 tests were carried out. In eight of the 10 tests, fire exposure continued until termination of the fire test, which was mainly caused by structural failure in the joints under tension when the beam was clearly in substantial catenary action. In the other two tests (one using fin plates and one using reverse channels), fire exposure stopped and forced cooling started when the beam was near a state of pure bending and just about to enter into catenary action. The results of the experiments indicate that even the relatively simple joints used in this study were able to allow the beams to develop substantial catenary action so that the final failure times and beam temperatures of the assemblies were much higher than those obtained by assuming the beams in pure bending. At termination of the tests, the beams reached very high deflections (about span/5), even then failure of the assemblies always occurred in the joints. Therefore, to enable the beams to reach their full potential in catenary action, the joints should be made to be much stronger. The results also indicate that reverse channel connection has the potential to be developed into a robust connection characterised by high stiffness, strength, rotational capacity and ductility. The beams in the two cooling tests developed high tension forces, however there was no structural failure in the assemblies. The principal aim of this paper is to present experimental results of joint behaviour in fire (which until now is lacking) to enable development of better understanding and rational design methods for robust construction of joints to resist extreme fire attack.