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Steel and Composite Structures Volume 22, Number 1, September20 2016 , pages 183-201 DOI: https://doi.org/10.12989/scs.2016.22.1.183 |
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Effect of stiffeners on failure analyses of optimally designed perforated steel beams |
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Ferhat Erdal
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| Abstract | ||
| Perforated steel beams can be optimised by increased beam depth and the moment of inertia combined with a reduced web thickness, favouring the use of original I-section beams. The designers are often confronted with situations where optimisation cannot be carried out effectively, taking account of the buckling risk at web posts, moment-shear transfers and local plastic deformations on the transverse holes of the openings. The purpose of this study is to suggest solutions for reducing these failure risks of tested optimal designed beams under applying loads in a self-reacting frame. The design method for the beams is the hunting search optimisation technique, and the design constraints are implemented from BS 5950 provisions. Therefore, I have aimed to explore the strengthening effects of reinforced openings with ring stiffeners, welded vertical simple plates on the web posts and horizontal plates around the openings on the ultimate load carrying capacities of optimally designed perforated steel beams. Test results have shown that compared to lateral stiffeners, ring and vertical stiffeners significantly increase the loadcarrying capacity of perforated steel beams. | ||
| Key Words | ||
| perforated steel beams; effect of stiffener; load carrying capacity; optimum design; failure modes of beams | ||
| Address | ||
| Department of Civil Engineering, Akdeniz University, 07058, Antalya, Turkey. | ||