An experimental investigation of the fire behaviour of demountable composite beams with profiled steel decking
An experimental investigation of the fire behaviour of demountable composite beams with profiled steel decking
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DOI：
10.1016/j.engstruct.2024.117944
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发表时间：
2024-05
影响因子：
5.5
通讯作者：
Jiejie Long;Yongchang Wang;Guobiao Lou;Zhiyou Hu;Tao Yang;Qinghua Tan;Lu Ke
中科院分区：
文献类型：
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作者：
Jiejie Long;Yongchang Wang;Guobiao Lou;Zhiyou Hu;Tao Yang;Qinghua Tan;Lu Ke
本文介绍了一个详细的试验研究结果的预制可拆卸组合梁（PDCBs）的火灾行为与螺栓剪力连接。进行了四次全尺寸标准耐火性测试，以评估在环境温度和不同的火灾暴露持续时间（无防火保护和有防火保护以实现标称60分钟耐火性）下具有不同剪切连接程度（65%和33%）的PDCB的性能。试验结果表明，欧洲规范4第1.2部分简化近似，以获得等效的剪力钉和混凝土温度的剪力连接件在火灾中的电阻计算仍然适用于可拆卸的剪力连接件，尽管不同的热传递条件从传统的焊接剪力连接件的不同的火灾暴露时间。较低的抗剪连接件和混凝土温度使抗剪连接件能够增强其相对于具有高得多的温度的钢截面的抵抗力，从而大大增加了防火设计中的抗剪连接程度。欧洲规范EN 1994 -1-2中的设计计算方法适用于带可拆卸剪力连接件的组合梁。试验观察也证实了不同组合板段之间的混凝土灌浆效果良好。
This paper presents the results of a detailed experimental investigation of the fire behaviour of prefabricated demountable composite beams (PDCBs) with bolted shear connectors. Four full–scale standard fire resistance tests were conducted to evaluate the performance of PDCBs with varying degrees of shear connection (65% and 33%) at ambient temperature and different durations of fire exposure (without fire protection and with fire protection to achieve a nominal 60 min’ fire resistance). The experimental results indicate that the Eurocode 4 Part 1.2 simplified approximations to obtain equivalent shear stud and concrete temperatures for the calculation of shear connector resistance in fire are still applicable to demountable shear connectors for different fire exposure durations despite different heat transfer conditions from conventional welded shear connectors. The lower shear connector and concrete temperatures enable the shear connector to enhance its relative resistance to the steel section that has much higher temperatures, thereby greatly increasing the degree of shear connection in fire design. The design calculation method in Eurocode EN1994–1-2 can be applied to composite beams with demountable shear connectors. The experimental observations also confirm that the concrete grouting between different composite slab segments performed well.