Comparative Analysis and Design of Tapered Section Used in Pre-Engineered Building

https://doi.org/10.46610/JoST.2026.v011i02.003

Abstract

Pre-Engineered Buildings (PEBs) have emerged as an efficient alternative to conventional steel structures due to their optimized material usage, reduced self-weight, and faster construction. This study presents a comparative analysis and design of tapered sections used in PEB portal frames to evaluate the influence of rafter break point location on structural behaviour. Five different structural models were developed using STAAD.Pro with identical geometry, loading conditions, and design criteria in accordance with ARE 800:2007, IS 875, and ARE 1893:2016. Among the five models, Model I was designed strictly based on bending moment requirements, while the remaining models were configured with varying rafter break points without strict adherence to moment-based design. The analysis includes evaluation of key parameters such as frame weight, bending moment, and support reactions under dead, live, wind, and seismic loads. The results indicate that Model I achieves the minimum structural weight, demonstrating efficient material utilization, whereas Model IV provides improved overall structural performance with better force distribution. It is observed that variation in rafter break point significantly affects bending moment distribution and structural efficiency, while support reactions remain nearly constant across all models. The study concludes that bending moment-based design is essential for achieving economical and optimized PEB structures, while intermediate tapering configurations can enhance overall performance.