Steel structures are nowadays commonly adopted as prefabricated modes of construction.Technically , Steel structures are also known as industrial structures. Construction of Godowns, Factories , Cat walks, Solar power plants are designed and constructed as steel structures. IS codes used for design is IS 800 :2009.
For foundation- Safe 2016, Staad Foundations, MS Excel Sheets
For design – Staad Pro, Tekla structures
For drafting – AutoCAD, Revit Architecture
For estimate/bbs preparation – MS Excel Customized Sheets