COMPARATIVE MANUAL ANALYSIS OF A PORTAL FRAME USING CONVESTIONAL AND PERFROMANCE – BASED DESIGN APPROACH FOR EARTHQUAKE RESISTANCE

Abstract

This study presents a manual comparative analysis of a portal frame subjected to seismic forces using two distinct approaches: Conventional Code-Based Design (CBD) and Performance-Based Design (PBD). The conventional method follows IS 1893:2016 for equivalent static analysis, while the PBD method is based on displacement and energy dissipation concepts. A two-storey steel portal frame is manually analyzed using both approaches to evaluate base shear, lateral displacement, inter-storey drift, and hinge formation. The results show that while conventional design ensures life safety, PBD provides enhanced understanding of structural behavior under different performance objectives like Immediate Occupancy (IO) and Collapse Prevention (CP). The study highlights the practical benefits and limitations of both methods in manual applications.