ISSN: 2277-3754 International Journal of Engineering and Innovative Technology (IJEIT) ISO 9001:2008 Certified Volume 2, Issue 1, July 2012 365 Abstract— Use of castellated beam for various structures rapidly gaining appeal. This is due to increased depth of section without any additional weight, high strength to weight ratio, their lower maintenance and painting cost. The principle advantage of castellated beam is increase in vertical bending stiffness, ease of service provision and attractive appearance. However one consequence of presence of web opening is the development of various local effects. In this paper steel I section was selected, castellated beams were fabricated with increase in depth of web openings. To analyze the behavior of castellated steel beams having an I-shaped cross-section, modeling is conducted using finite element software package ANSYS14. Analysis is carried out on beam with two point load and simply supported support condition. The deflection at centre of beam and study of various failure patterns are studied. The beams with increase in depth are then compared with each other and with parent section for various parameters and for serviceability criteria. From the finite element analysis results, it is concluded that, the Castellated steel beam behaves satisfactorily with regards to serviceability requirements up to a maximum web opening depth of 0.6h. Castellated beams have proved to be efficient for moderately loaded longer spans where the design is controlled by deflection. Index Terms- Castellated Beam, Web Opening, Cellular Beam, Virendeel Mechanism, Plastic Hinges. I. INTRODUCTION Engineers are constantly trying to improve the materials and practices of design and construction. One such improvement occurred in built-up structural members in the mid-1930, an engineer working in Argentina, Geoffrey Murray Boyd, is castellated beam. Castellated beams are such structural members, which are made by flame cutting a rolled beam along its centerline and then rejoining the two halves by welding so that the overall beam depth is increased by 50% for improved structural performance against bending. Since Second World War many attempts have been made by structural engineers to find new ways to decrease the cost of steel structures. Due to limitations on minimum allowable deflection, the high strength properties of structural steel cannot always be utilized to best advantage. As a result several new methods aimed at increasing stiffness of steel member, without any increase in weight of steel required. Castellated beam is one of the best solutions. The responsibility of a Structural Engineer lies in not merely designing the structure based on safety and serviceability considerations but he also has to consider the functional requirements based on the use to which the structure is intended. While designing a power plant structure or a multi-storied building, the traditional structural steel framing consists of beams and girders with solid webs. These hinder the provision of pipelines and air conditioning ducts, electrical wiring required for satisfactory functioning for which the structure is put up. The re-routing of services (or increasing the floor height at the design stage for accommodating them) leads to additional cost and is generally unacceptable. The provision of beams with web openings has become an acceptable engineering practice, and eliminates the probability of a service engineer cutting holes subsequently in inappropriate locations. Beams with web openings can be competitive in such cases, even though other alternatives to solid web beams such as stub girders, trusses etc are available. This form of construction maintains a smaller construction depth with placement of services within the girder depth, at the most appropriate locations. The introduction of an opening in the web of the beam alters the stress distribution within the member and also influences its collapse behavior. Fig.1 Terminology Web Post: The cross-section of the castellated beam where the section is assumed to be a solid cross-section. Throat Width: The length of the horizontal cut on the root beam. The length of the portion of the web that is included with the flanges. Throat Depth: The height of the portion of the web that connects to the flanges to form the tee section. II. FORMULATION OF RESEARCH OBJECTIVES To achieve economy, castellated beam fabricated from its parent solid webbed „I‟ section should have maximum possible depth. An available literature does not deal with the Finite Element Analysis of Castellated Steel Beam M.R.Wakchaure, A.V. Sagade