Torsional Analysis of Castellated Beam with Stiffener using Indian Standard Code

Castellated Beam is a name commonly used for type of expanded beam. It is made by expanding a standard rolled section in a manner which creates a regular pattern of holes in the web. This expansion of web of a beam results in increase in lever arm, thus ultimately increase in the moment of resistance without increase in weight of the beam. Furthermore the holes created in the web portion of a beam can be used for the passing of service lines. These beams has high strength to weight ratio. Generally most of the steel structures are designed for bending and not for torsion. But many times situations do come when these beams are subjected to torsional loading. In this paper a castellated beam is designed as per the Indian standard code based methodology. A three basic opening shapes namely Hexagon, Sinusoid and Diamond are subjected to torsional loading and there performance under torsional loading is studied.