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

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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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Acknowledgements

This work is supported by the Engineering and Physical Sciences Research Council of United Kingdom with Grant No. EP/N011201/1.

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Authors and Affiliations

  1. School of Civil Engineering, Tongji University, Shanghai, 200092, China

    Mengjie Wang, Guobiao Lou & Zhaohan Wen

  2. School of Civil Engineering, Central South University, Changsha, 410075, China

    Binhui Jiang

  3. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK

    Yongchang Wang

  4. Sichuan Fire Science and Technology Research Institute of MEM, Sichuan, 610036, China

    Yaqiang Jiang

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  1. Mengjie Wang
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Correspondence to Binhui Jiang.

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Wang, M., Lou, G., Wen, Z. et al. Study on Fire Resistance of Prefabricated Demountable Composite Beams Using Bolted Shear Connectors. Fire Technol (2024). https://doi.org/10.1007/s10694-023-01533-1

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