Investigation the stress behavior of castellated steel beams

The deflection and stress values which occur at load-carrying elements of structures are become critical by increasing number of the structures which have long span and multi-story. In this deflection and stress values were evaluated according to type of web opening, different number of web opening, and the triangle plates which are welded to corner of the web openings. The investigated beams were drawn and analysis as shell element through SAP2000 program. As a result of investigation, some points are observed that while maximum stresses occur at corner of web opening of castellated beams, the maximum stresses occur at the flange part of the I or H sectioned beam which are the root beam of castellated beams. In addition, the stresses are concentrated at castellated beams which have web opening according to sudden changing of cross-section of opening, however the stresses are distributed at the castellated beams which have web opening by smoot changing of cross-section. The deflection values of castellated beams are smaller than the I or H cross-section beam when design with same span and load concentration, because of the height of the castellated beam is higher than I or H cross-sectioned beam. Consequently, the design and analysis of castellated beams are necessary for specifying the behavior, deflection values of the castellated beams. Key Words: Steel Beams, Castellated Beams, Web Opening, Shell Stress Analysis, Circular, Hexagonal, Rectangular Web Opening, Stress, Stress Concentration, Deflection.