Seismic acceleration amplification factor under fixed and pin supported RC frame building

Abstract

Assessing non-structural elements' vulnerability to acceleration relies on peak horizontal floor acceleration. Given the dynamic nature of structures, estimates for forces acting on elements like mechanical, electrical, or architectural components are crucial. The amplification factor for these non-structural components is affected not just by building height but also by the structural support conditions. This study examined five distinct building models spanning 2, 4, 6, 8, and 10 stories. These models were analysed using the linear time history method under various near-field Chi-chi earthquake scenarios (ranging from 0.01g to 0.067g, 0.067g to 0.2g, and 0.2g to 0.32g). This analysis aimed to determine the acceleration amplification factor (Ω), representing the ratio of peak floor acceleration to ground acceleration, for both fixed and pinned support conditions. A disparity emerged after comparing the actual acceleration amplification values under fixed and pinned support conditions with those from previous models. While some models performed adequately under fixed support conditions, others yielded accurate results under pinned support conditions. Consequently, there's no singular formula capable of effectively accommodating both support conditions across the varying ranges of ground motion.