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Steel and Composite Structures Volume 46, Number 4, February25 2023 , pages 539-551 DOI: https://doi.org/10.12989/scs.2023.46.4.539 |
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Study on the fire resistance of castellated composite beams with orthohexagonal holes and different beam-end constraints |
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Junli Lyu, Encong Zhu, Rukai Li, Bai Sun and Zili Wang
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| Abstract | ||
| In order to study the fire resistance of castellated composite beams with ortho-hexagonal holes and different beamend restraints, temperature rise tests with constant load were conducted on full-scale castellated composite beams with orthohexagonal holes and hinge or rigid joint constraints to investigate the temperature distribution, displacement changes and failure patterns of castellated composite beams with two different beam-end constraints during the whole course of fire. The results show that (1) During the fire, the axial pressure and horizontal expansion deformation generated in the rigid joint constrained composite beam were larger than those in the hinge joint constrained castellated composite beam, and their maximum horizontal expansion displacements were 30.2 mm and 17.8 mm, respectively. (2) After the fire, the cracks on the slab surface of the castellated composite beam with rigid joint constraint were more complicated than hinge restraint, and the failure more serious; the lower flange and web at the ends of the castellated steal beams with hinge and rigid joint constraint produced serious local buckling, and the angles of the ortho-hexagonal holes at the support cracked; the welds at both ends of the castellated composite beam with rigid joint constraint cracked. (3) Based on the simplified calculation method of solid-web composite beam, considering the effect of holes on the web, this paper calculated the axial force and displacement of the beam-end constrained castellated composite beams under fire. The calculation results agreed well with the test results. | ||
| Key Words | ||
| axial force; calculation method; castellated composite beams; different beam-end constraints; fire test; horizontal displacement | ||
| Address | ||
| Junli Lyu:1)School of Civil Engineering, Shandong Jianzhu University, Jinan, 250101, China 2)Key Lab of Building Structural Retrofitting and Underground Space Engineering, Ministry of Education, Jinan 250101, China Encong Zhu, Rukai Li, Bai Sun and Zili Wang:School of Civil Engineering, Shandong Jianzhu University, Jinan, 250101, China | ||