Publication: Numerical optimization of web opening shapes, sizes and arrangement in i-beam steel section
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Date
2020-12-01
Authors
Hashim, Nor Salwani
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Abstract
The typical hexagonal and circular web opening section was extensively used in steel construction. However, the use of section with different arrangement of web opening had improved the structural behaviour of the perforated section leads to economic design compared to typical I-beam. This research presented the finite element analysis (FEA)
for the numerical discretisation on section with different arrangement of web openings to investigate the bending behaviour, lateral torsional buckling behaviour and torsion
behaviour. Five shapes and three sizes of web opening employed in this research. The shapes involved are c-hexagon, hexagon, octagon, circular and square whereas the sizes
of the web opening involved which are 0.67D, 0.75D and 0.80D where D is the height of the web. Two types of models for 200×100×8×6 mm steel section involved which is
Model 1; where the section with 50 mm edge and 150 mm centre to centre distance and Model 2; where the section with 100 mm edge and 200 mm centre to centre distance.
Throughout the analysis, 0.67D is the optimum size of web opening. Model 2 which was the centre to centre distance is 200 mm and the edge distance is 100 mm found as the
optimum model compare to Model 1. Meanwhile, c-hexagon is the optimum shapes of web opening. The results of the optimum shape and size of web opening for 1.1 m beam length, then applied to different span length and structural properties to analyze the structural behaviour of I-beam with different arrangement of web opening. The analysis
results showed that type E is optimum in bending and torsion behaviour compare to I-beam. However, type D is optimum in lateral torsional buckling behaviour. Then, a
numerical study for the optimum section is conducted on the effect of span length, flange thickness, web thickness and section width.