BEHAVIOR OF GRAVITY COLUMN UNDER SEISMIC LOADING

Abstract

The seismic performance of RC structures incorporating gravity column in conjunction with shear wall has evolved significantly over the years, driven by the need for cost- efficient structural system. This study evaluates a G+6 RC building under seismic loading, comparing three configurations, conventional column (Model-1), conventional column and shear wall (Model-2) and conventional column and shear walls (Model-4). Gravity column were modelled in ETABS using moment release (M22 and M33) to ensure they resist only vertical loads, a method validate for its accuracy and constructability. Response spectrum analysis (RSA) revealed that Model-2 exhibited the highest lateral stiffness, with 14-20% lower time period and 10-15% reduced displacement compared to Model-1. Model-4 incorporating gravity columns, achieved 85-95% of Model-2’s performance, with marginal 1.4-2.4% reduction in base shear and 3.2% longer time periods, indicating balanced stiffness and flexibility. The finding highlights the practical application of gravity column in mid-rise building, particularly in seismic zone-III where they optimize space, reduce construction cost.