Study on Fire Resistance of Prefabricated Demountable Composite Beams Using Bolted Shear Connectors

IF 2.3 3区工程技术 Q2 ENGINEERING, MULTIDISCIPLINARY Fire Technology Pub Date : 2024-01-15 DOI:10.1007/s10694-023-01533-1

Mengjie Wang, Guobiao Lou, Zhaohan Wen, Binhui Jiang, Yongchang Wang, Yaqiang Jiang

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Abstract

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.

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使用螺栓剪力连接件的预制可拆卸复合梁耐火性研究

使用螺栓作为钢-混凝土复合梁的剪力连接件可实现预制组装，并使预制构件的可拆卸和重复使用成为可能。然而，有关用螺栓连接的预制可拆卸复合梁（PDCB）耐火性能的研究还很有限。本文进行了四次全尺寸耐火试验，以研究通过与钢梁平行的异型板肋的剪切螺栓连接的 PDCB 的耐火性。通过耐火试验获得了试验观察结果、加热曲线、变形曲线和试样临界温度。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 上，而不是完全连接的 PDCB 上。在相同的荷载比下，有防火保护的 PDCB 的耐火极限是无防火保护的 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，根据分析结果，对 PDCB 中钢梁上翼缘温度的计算方法提出了相关建议。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fire Technology 工程技术-材料科学：综合

CiteScore

6.60

自引率

14.70%

发文量

137

审稿时长

7.5 months

期刊介绍： Fire Technology publishes original contributions, both theoretical and empirical, that contribute to the solution of problems in fire safety science and engineering. It is the leading journal in the field, publishing applied research dealing with the full range of actual and potential fire hazards facing humans and the environment. It covers the entire domain of fire safety science and engineering problems relevant in industrial, operational, cultural, and environmental applications, including modeling, testing, detection, suppression, human behavior, wildfires, structures, and risk analysis. The aim of Fire Technology is to push forward the frontiers of knowledge and technology by encouraging interdisciplinary communication of significant technical developments in fire protection and subjects of scientific interest to the fire protection community at large. It is published in conjunction with the National Fire Protection Association (NFPA) and the Society of Fire Protection Engineers (SFPE). The mission of NFPA is to help save lives and reduce loss with information, knowledge, and passion. The mission of SFPE is advancing the science and practice of fire protection engineering internationally.