COMPARISON OF GABLE ROOF FACTORY STEEL WEIGHT BETWEEN PEB AND CELLULAR BEAM SYSTEM ACCORDING TO DPT 1311-50 WIND LOAD DESIGN STANDARD

Abstract

This research studies the factory steel roof structures in the PEB and the Cellular Beam systems according to the DPT1311-50 wind resistance design standard by comparing weight of the steel structures obtained from the design. The commercial software named “RFEM” were used in the analysis and design of the roof structures. The parameters considered in this study comprise of the span length varied from 20, 30, 40 and 50 m. , the roof slope of 5 and 7.5 degree and the column height of 9 and 12 m. under the design mean wind speed of 25 m/s. The steel members were designed using the Load & Resistance Factor Design (LRFD360-1 6) method of the American Institute of Steel Construction ( AISC) standard and the ministerial regulation B.E.2566 of Thailand. From the analysis and design results, it is found that the steel weight of the whole structure shall increase with the increasing of the span length, the column height and the roof slope for both roof systems. In all design cases, the PEB roof system is steel weight less than the cellular beam system for about 5-40%.