Steel and Composite Structures

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Study on the fire resistance of castellated composite beams with ortho-hexagonal holes and different beam-end constraints

  • Junli Lyu (School of Civil Engineering, Shandong Jianzhu University) ;
  • Encong Zhu (School of Civil Engineering, Shandong Jianzhu University) ;
  • Rukai Li (School of Civil Engineering, Shandong Jianzhu University) ;
  • Bai Sun (School of Civil Engineering, Shandong Jianzhu University) ;
  • Zili Wang (School of Civil Engineering, Shandong Jianzhu University)
  • Received : 2022.03.29
  • Accepted : 2023.02.01
  • Published : 2023.02.25
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Abstract

In order to study the fire resistance of castellated composite beams with ortho-hexagonal holes and different beam-end restraints, temperature rise tests with constant load were conducted on full-scale castellated composite beams with ortho-hexagonal 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.

Keywords

Acknowledgement

The research described here received financial support from the Key Program of National Natural Science Foundation of China (Project No.52038006) and the General Program of National Natural Science Foundation of China (Project No.51878398 and 52178490).

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