Study on Fire Resistance of Prefabricated Demountable Composite Beams Using Bolted Shear Connectors
Study on Fire Resistance of Prefabricated Demountable Composite Beams Using Bolted Shear Connectors
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DOI：
10.1007/s10694-023-01533-1
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发表时间：
2024-01
期刊：
影响因子：
3.4
通讯作者：
Mengjie Wang;Guobiao Lou;Zhaohan Wen;Binhui Jiang;Yongchang Wang;Yaqiang Jiang
中科院分区：
文献类型：
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作者：
Mengjie Wang;Guobiao Lou;Zhaohan Wen;Binhui Jiang;Yongchang Wang;Yaqiang Jiang
采用螺栓作为钢-混凝土组合梁的剪力连接件，实现了预制构件的预制装配，使预制构件的拆卸和再利用成为可能。然而，关于螺栓连接预制可拆卸组合梁(PDCB)的抗火性能的研究还很有限。本文进行了四个足尺抗火试验，研究了平行于钢梁的压型板肋抗剪螺栓连接的PDCB的抗火性能。通过耐火试验获得了试件的试验观测、升温曲线、变形曲线和临界温度。试验结果表明，螺栓连接件的剪切破坏发生在部分连接的PDCB，而不是全连接的PDCB。在相同的荷载比下，有防火保护的PDCB的耐火极限是无防火的PDCB的4.4倍。现有规范高估了PDCB中钢梁上翼缘的温度。此外，还进行了数值传热分析，研究了混凝土板厚度、混凝土含水率和钢梁上翼缘尺寸对钢梁上翼缘温度分布的影响。最后，根据计算结果，对PDCBs中钢梁上翼缘温度的计算方法提出了相应的建议。
Using bolts as shear connectors of the steel–concrete composite beams enables prefabricated assembly and makes it possible to demountable and reuse the prefabricated components. However, studies on the fire resistance of prefabricated demountable composite beams (PDCBs) connected by bolts are limited. In this paper, four full-scale fire resistance tests were conducted to investigate the fire resistance of PDCBs connected by shear bolts with profiled sheet ribs parallel to the steel beam. Experimental observations, heating curves, deformation curves, and critical temperatures of specimens were obtained through fire-resistant tests. Test results show that the shear failure of bolted connectors occurred in the partially connected PDCBs instead of in the fully connected ones. Under the same load ratio, the fire resistance limit of PDCBs with fire protection was 4.4 times that of PDCBs without fire protection. The temperatures of the upper flanges of the steel beams in the PDCBs were overestimated by the existing codes. Moreover, numerical heat transfer analysis was carried out to investigate the effect of concrete slab thickness, concrete moisture content and steel beam upper flange dimensions on the temperature distribution of the steel beam upper flange. Finally, based on the results, relevant recommendations are made for the method of calculating the temperature of the steel beam upper flange in the PDCBs.