The Structural Engineer > Archive > Volume 35 (1957) > Issues > Issue 12 > An Investigation of the Stresses and Deflections in Castellated Beams
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An Investigation of the Stresses and Deflections in Castellated Beams

THE behaviour of castellated I beams which are primarily I beams with regularly spaced hexagonal holes in the webs is investigated for the case of bending in a simply supported centrally loaded beam. An approximate analysis is presented which presumes that the beam will behave as a vierendeel girder, this is followed by a photoelastic investigation in which a model castellated I beam is used. The second part of the experimental investigation is concerned with the stress distribution and deflections of actual steel castellated beams as supplied by the manufacturers. The derived theory is applied to both the latter and the previous photoelastic investigation. Finally the elementary beam theory as used by the manufacturers in compiling safe load tables is examined in relationship to the presented theory and the experimental results. J. E. Gibson and W. M. Jenkins

Author(s): Gibson, J E;Jenkins, W M

Keywords: castellated beams;deflection;stresses;analysis