Abstract
Numerical study on torsion behaviour of I-beam with web opening was carried out and presented in this paper. Optimum shapes and sizes which enhance the torsion behaviour of the I-beam with web opening as well as lead to economic design in terms of both manufacture and usage.Comparison is made between I-beam without web opening and I-beam with various shapes and sizes of web opening. Different types of finite elements model, sizes and types of web opening were used to investigate the effect of various shapes and sizes of web opening on the torsion behaviour. The results are expressed in terms of torsional rotation. It is concluded that I-beam without web opening has lower torsional resistance compared to that of I-beam with various shapes of web opening. Meanwhile, the model 2 is the optimum model compare to model 1.The size of opening has slightly effect on the torsional angles values. It was noted that the optimum web opening size is 0.5D due to the low values of the torsional angle values compared with 0.6D and 0.7D.
Highlights
Nowadays, the provision of beams with web openings more reliable engineering practice, and eliminates the probability to cut the holes subsequently in inappropriate locations
Studies on the behaviour of steel beams with web opening using finite element analysis have been conducted in detail over the last three decades [8]
It was noted that the optimum web opening size is 0.5D due to the low values of the torsional angle values compared with 0.6D and 0.7D
Summary
The provision of beams with web openings more reliable engineering practice, and eliminates the probability to cut the holes subsequently in inappropriate locations. This form of construction maintains a smaller construction depth with placement of services within the girder depth, at the most appropriate locations. In modern composite structures, the behaviour of statically indeterminate castellated composite beams is more complex than that of supported beams [5]. This is because instability effects of the castellated composite beam may be subjected to the negative moment regions where the bottom compression flange of the beam is unrestrained. The secondary torsion moment deformation effect was included into the stiffness matrix [11]
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