This document discusses the structural analysis and design of different types of castellated beams. It begins with an abstract that outlines the advantages of castellated beams in increasing strength and economy. It then discusses the use of castellated beams in various structures and the fabrication process. The document outlines the design process for castellated beams, which involves selecting cutting angles, computing loads and moments, checking shear capacity, and ensuring stress and deflection limits are not exceeded. It concludes that castellated beams allow for increased structural depth without weight increase, improving strength to weight ratios and reducing costs.