Abstract
Lateral torsional buckling may occur in an unrestrained beam. A beam is considered to be unrestrained when its compression flange is free to laterally rotate and laterally displace. In this paper, the finite element analysis is used to investigate the lateral torsional buckling behavior of I-beam with and without web opening. The analysis considers a wide range of practical distances between two openings as well as, various shapes and sizes of web opening. Analysis results show that the size of web opening has slightly effect on the buckling moment resistance. Furthermore, five shapes and three sizes of opening with 1.1m section length were used to find the optimum size and shapes of opening. It was concluded that, the optimum size is 0.5D due to the high values of the buckling moment compared with 0.6D and 0.7D. Meanwhile, model 2 is classified as the optimum model because the value of buckling moment is higher than model 1. It was noted that C-hexagon has the highest buckling moment compared to other web opening shapes. Besides that, the differences in buckling moment values decrease when the opening becomes larger in size such as square opening. However, I-beam without web opening has the highest buckling moments resistance compared to C-hexagon.
Highlights
INTRODUCTIONA great deal of design for both steel and composite beams with web openings
In recent years, a great deal of design for both steel and composite beams with web openings
The analysis considers a wide range of practical distances between two openings as well as, various shapes and sizes of web opening
Summary
A great deal of design for both steel and composite beams with web openings. Castellated steel beam which is fabricated from standard hot-rolled I-section has a lot of advantages such as aesthetic architectural appearance, ease of services through the web openings, optimum self-weight-depth ratio, economic construction, larger section modulus, and greater bending rigidity. The composite use of cellular beams with a concrete slab has become increasingly popular within which the resulted section benefits from the concrete’s compressive strength and steel’s tensile strength. This composite action has added to the complexities of implementing simple methods to design cellular composite beams [20]. The presence of web openings will affect the lateral torsional buckling behavior of the beam
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