Comparative Study on Static and Dynamic Analysis of a G+5 RCC Building as per IS 1893 (Part 1): 2016 on Serviceability Parameters

Accurate estimation of seismic forces and structural response is essential for earthquake-resistant design. IS 1893 (Part 1):2016 allows the use of both Equivalent Static Analysis (ESA) and Response Spectrum Analysis (RSA) for regular medium-rise RCC buildings, though the responses obtained from these methods may differ. This study presents a comparative seismic analysis of a G+5 RCC building located in Seismic Zone III with medium soil conditions and 5% damping, modelled and analysed in ETABS as per IS 1893 provisions. Storey displacement and storey drift in both X and Y directions are evaluated under static and dynamic loading. The equivalent static base shear is observed to be higher than the unscaled dynamic base shear; therefore, response spectrum results are scaled to satisfy code requirements. The results indicate that ESA may not adequately represent the actual mass and stiffness distribution, leading to possible over- or underestimation of displacement and drift demands, whereas RSA provides a more realistic variation of seismic response along the height. The study concludes that although both methods are applicable for G+5 buildings, response spectrum analysis offers a more reliable assessment of seismic performance.