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This paper explores the influence of four different shapes of geometric imperfection upon the collapse of castellated and cellular beams. A numerical model developed in ANSYS and calibrated against experimental results was used to investigate the effects of each imperfection shape. The global imperfection (weak-axis bending) did not affect web-post stability. Webpost bending favored the development of plastic yielding, while web-post misalignment and the local buckling mode strongly compromised web-post stability. The choice of imperfection shape was shown to determine the failure mode of the beams, directly affecting the quality of the numerical results and potentially influencing design decisions. Received: Revised: Accepted: 8 October 2019 7 June 2020 22 June 2020

INFLUENCE OF DIFFERENT SHAPES OF GEOMETRIC IMPERFECTIONS ON THE STRUCTURAL BEHAVIOR OF BEAMS WITH LARGE WEB OPENINGS