Optimum Opening Size and Layout of Elastic Cellular Steel Beams

Abstract

Research on castellated beams has in the past focused on beams with hexagon shaped web openings. Field experience has shown that damage on castellated beams are mostly due to cracks occurring at opening corners. Therefore research on castellated steel beams with smooth sided openings is felt necessary. In this study the behavior of beams with circular or elliptical web openings are considered. The shape, size, and layout of the openings are required to meet optimum conditions, such that the best economic solution may be achieved. Optimum conditions are acquired apply it Genetic Algorithms simulating the Darwinian theory of evolution. It is hoped that results of the investigation may further develop the current tradition of designing castellated steel I-beams.