Optimisation of novel elliptically-based web opening shapes of perforated steel beams

Abstract

A new study was carried out and presented herein, on the optimisation of novel elliptically-based web opening shapes which enhance the structural behaviour of the perforated beams as well as lead to economic design in terms of both manufacture and usage. The finite element (FE) model used in the study was validated against experimental work conducted by the authors and the results of the comprehensive study are presented in this research paper. For ease of comparison, the yield patterns and deflected shapes of the perforated beams are presented at three 'characteristic' load level points. Finally, shear-moment interaction FEM curves are presented for six novel web opening shapes to allow for easy use of the empirical design formulas that have previously been proposed by the authors in a complementary research paper. An overall study of many standard and non-standard web opening shapes, it was shown that perforated beams with vertical and inclined classic elliptical web openings (3:4 width to depth ratio) behave more effectively compared to perforated beams with conventional circular and hexagonal web openings, mainly in terms of stress distribution and local deflection. Therefore, perforated steel beams with large novel elliptically-based web openings with short critical opening length at the top and bottom tee-section as well as straight-line edges are presented for first time and examined in the current research programme. To define the various web opening configurations with different web opening areas, two main parameters are varied: the angle (θ) of the straight lines and the radius (R) of the semicircles at the top and bottom tee-sections. Four θ angles (10 o , 20 o , 30 o and 40 o) as well as four R radii (0.15d o , 0.2d o , 0.25d o and 0.3d o) and their combinations were modelled for now. The elliptical form of these web openings was investigated in both the vertical and inclined configurations.

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Genetic Algorithm for Embodied Energy Optimisation of Steel-Concrete Composite Beams

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