Seismic performance evaluation of reinforced concrete flat slab buildings using ETABS: Fid-Bau Portal

Seismic performance evaluation of reinforced concrete flat slab buildings using ETABS

Gupta, Pranjal / Gupta, Chayan

This study presents a detailed seismic analysis of reinforced concrete (RC) flat slab buildings using ETABS software. The study encompasses both symmetric and non-symmetric structural configurations, complying with IS 456:2000 for design, IS 13920:2016 for ductile detailing, and IS 1893:2016 for seismic forces in seismic region III. In this paper, five structural configurations are analysed, i.e., flat plate, flat slabs with drop panels, column heads on flat slabs, flat slabs with column heads and slab descents, and area beams with flat slabs. Seismic performance is assessed using Equal Static Linear Analysis and Pushover Static Non-Linear Analysis, focusing on base shear capacity, maximum story displacement, drift ratios, and hinge formation. Equal Static Linear Analysis results show an increase in base shear capacity from 2500 kN (Flat Plate) to 3000 kN (Area Beam with Flat Slab), with corresponding reductions in maximum story displacement from 40 mm to 28 mm and drift ratios from 1.5 to 1%. Pushover analysis indicates the Area Beam with Flat Slab configuration achieves the highest performance point and base shear capacity, with the lowest roof displacement and delay in hinge formation. Response Spectrum Analysis reveals that the Area Beam with Flat Slab configuration has the lowest peak acceleration and displacement, highlighting superior seismic performance. The study underscores the importance of structural elements like drop panels, column heads, and area beams in enhancing seismic resilience, providing valuable insights for designing safer, more resilient buildings in earthquake-prone regions.