A COMPARATIVE STUDY ON PERFORMANCE OF CONVENTIONAL AND PRE–ENGINEERED STEEL FRAMES

Abstract

Conventional steel frames are low rise steel frames with roofing systems of truss and roof coverings. Standard hot rolled sections are used for truss elements which are usually much heavier than what is actually required as per the design. Pre–Engineered steel frames are the steel frames in which excess steel is tapered as per the bending moment requirements. In the present study, conventional (i.e. Pratt truss) and Pre–Engineered (i.e. portal type) industrial steel frames are considered for an industrial building located at Davangere City. Dead Load (DL), Live Load (LL) and Wind Load (WL) are applied on both the frames as per IS 875–Part 1 (1987), IS 875–Part 2
(1987) and IS 875–Part 3 (2015) codal provisions respectively. The developed 2D models of Conventional and Pre– Engineered steel frames are analysed using STAAD Pro. software for various load combinations as specified by IS 800 (2007). The members of both the frames are designed for the worst load combination as per IS 800 (2007) codal provisions. Total mass of the steel required for both the conventional and Pre–Engineered steel frames is calculated and cost comparison is made to check the economy achieved in using Pre– Engineered steel frames over the conventional steel frames. About 90,000 Rs. saving in material cost is obtained by erecting the Pre–Engineered steel frames than the conventional steel frames. Thus Pre–Engineered steel frames are preferred over the conventional
steel frames.