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Abstract
Cellular and castellated beams are steel I-section beams with multiple circular or hexagonal web openings. Their most important advantage is their economic material use for applications in which they are loaded in strong axis bending. However, the design effort necessary for the use of cellular and castellated members will be higher than for unperforated members, due to the higher number of necessary design checks and the more complicated calculations because of the web openings. An example of this is the calculation of the deflections, which will be influenced by local deformations around the openings. An exact calculation of the deflection is rather complex and necessitates the use of elaborate expressions or specialized calculation software. The design effort is considerably smaller if simplified expressions for the deflection are used. In this paper, the different simplified design proposals for the deflection were compared with the results of a numerical parametric study of the deflection of cellular and castellated members. In this study, the effect of the web openings on the deflection was considered for different opening geometries, parent sections and beam lengths. The numerical results show that for longer beam lengths, the existing expressions are too conservative, while they are very unsafe for the shorter beam lengths. Further research will be necessary to examine the behaviour for the shorter lengths and to optimise the simple design expression for the deflection.
Keywords
deflection, FEM, cellular beams, castellated beams

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MLA
Sonck, Delphine, Laura Kinget, and Jan Belis. “Deflections of Cellular and Castellated Beams.” Future Visions (International Association for Shell and Spatial Structures), Proceedings. Amsterdam, The Netherlands: Koninklijk Instituut van Ingenieurs, Nederland, 2015. 1–12. Print.
APA
Sonck, D., Kinget, L., & Belis, J. (2015). Deflections of cellular and castellated beams. Future Visions (International Association for Shell and Spatial Structures), Proceedings (pp. 1–12). Presented at the Future Visions (International Association for Shell and Spatial Structures) (IASS2015), Amsterdam, The Netherlands: Koninklijk Instituut van Ingenieurs, Nederland.
Chicago author-date
Sonck, Delphine, Laura Kinget, and Jan Belis. 2015. “Deflections of Cellular and Castellated Beams.” In Future Visions (International Association for Shell and Spatial Structures), Proceedings, 1–12. Amsterdam, The Netherlands: Koninklijk Instituut van Ingenieurs, Nederland.
Chicago author-date (all authors)
Sonck, Delphine, Laura Kinget, and Jan Belis. 2015. “Deflections of Cellular and Castellated Beams.” In Future Visions (International Association for Shell and Spatial Structures), Proceedings, 1–12. Amsterdam, The Netherlands: Koninklijk Instituut van Ingenieurs, Nederland.
Vancouver
1.
Sonck D, Kinget L, Belis J. Deflections of cellular and castellated beams. Future Visions (International Association for Shell and Spatial Structures), Proceedings. Amsterdam, The Netherlands: Koninklijk Instituut van Ingenieurs, Nederland; 2015. p. 1–12.
IEEE
[1]
D. Sonck, L. Kinget, and J. Belis, “Deflections of cellular and castellated beams,” in Future Visions (International Association for Shell and Spatial Structures), Proceedings, Amsterdam, The Netherlands, 2015, pp. 1–12.
@inproceedings{6913948,
  abstract     = {{Cellular and castellated beams are steel I-section beams with multiple circular or hexagonal web openings. Their most important advantage is their economic material use for applications in which they are loaded in strong axis bending. However, the design effort necessary for the use of cellular and castellated members will be higher than for unperforated members, due to the higher number of necessary design checks and the more complicated calculations because of the web openings. An example of this is the calculation of the deflections, which will be influenced by local deformations around the openings. An exact calculation of the deflection is rather complex and necessitates the use of elaborate expressions or specialized calculation software. The design effort is considerably smaller if simplified expressions for the deflection are used.
In this paper, the different simplified design proposals for the deflection were compared with the results of a numerical parametric study of the deflection of cellular and castellated members. In this study, the effect of the web openings on the deflection was considered for different opening geometries, parent sections and beam lengths. The numerical results show that for longer beam lengths, the existing expressions are too conservative, while they are very unsafe for the shorter beam lengths. Further research will be necessary to examine the behaviour for the shorter lengths and to optimise the simple design expression for the deflection.}},
  author       = {{Sonck, Delphine and Kinget, Laura and Belis, Jan}},
  booktitle    = {{Future Visions (International Association for Shell and Spatial Structures), Proceedings}},
  isbn         = {{9789053630426}},
  keywords     = {{deflection,FEM,cellular beams,castellated beams}},
  language     = {{eng}},
  location     = {{Amsterdam, The Netherlands}},
  pages        = {{1--12}},
  publisher    = {{Koninklijk Instituut van Ingenieurs, Nederland}},
  title        = {{Deflections of cellular and castellated beams}},
  year         = {{2015}},
}