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Steel and Composite Structures Volume 32, Number 6, September25 2019 , pages 743-752 DOI: https://doi.org/10.12989/scs.2019.32.6.743 |
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Experimental studies on the behaviour of headed shear studs for composite beams in fire |
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Ohk Kun Lim, Sengkwan Choi, Sungwook Kang, Minjae Kwon and J. Yoon Choi
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| Abstract | ||
| Steel and concrete composite structures are commonly applied in multi-story buildings as they maximise the material strength through composite action. Despite the popularity of employing a trapezoidal deck slab, limited experimental data are available under elevated temperatures. The behaviour of the headed shear stud embedded in a transverse trapezoidal deck and solid slab was investigated at both ambient and fire conditions. Twelve push-out tests were conducted according to the ISO 834 standard fire utilising a customised electric furnace. A stud shearing failure was observed in the solid slab specimen, whereas the failure mode was changed from a concrete-dominated failure to the stud shearing in the transverse deck specimen with an increase in temperature. Comparisons between the experimental observations and design requirements are presented. The Eurocode design guidance on the transverse deck slab gives a highly conservative estimate for shear resistance. A new design formula was proposed to determine the capacity of the shear connection regardless of the slab type when the stud shearing occurs at high temperatures. | ||
| Key Words | ||
| composite beam; headed shear stud; push-out test; transverse deck; fire | ||
| Address | ||
| (1) Ohk Kun Lim: R&D Laboratory, Korea Fire Institute, 331 Jisam-ro, Gyeonggi-do, 17088, Republic of Korea; (2) Ohk Kun Lim, Sengkwan Choi: School of the Built Environment, Ulster University, Newtownabbey, BT37 0QB, UK; (3) Sungwook Kang, Minjae Kwon, J. Yoon Choi: Fire Safety Centre, Korea Conformity Laboratories, 73 Yangcheong 3-gil, Cheongju, 28115, Republic of Korea. | ||