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Cable-stayed bridges were originally developed in the late 16th century but became less popular towards the end of the 20th century when suspension and reinforced concrete designs became more commonly used. However, advancements in material and methods have made them popular again in 21st century, particularly for longer -span crossings. They are suitable for spans longer than cantilever bridges but shorter than suspension bridges, and their main feature is the direct connection of cable from the tower to the deck. Cable-stayed bridges have undergone significant technical advancements and now have impressive aesthetic appearances, thanks to improvements in material, engineering analysis and design, and construction methodology. This thesis focuses on the design and analysis of four different pylon -shaped cable- stayed bridges with semi-fan cable arrangements using STAAD.Pro V8i software for designing and MS excel for comparative analysis. The primary aim of the thesis is to provide a detailed description of the structural behaviour of these bridges and present a comparative analysis.