Comparative Seismic Study of RC High-Rise (UG + G + 7) Structures with Varying Plan, Beam, and Column Section Configurations under Earthquake Loading

Abstract

This study presents a comparative seismic analysis of reinforced concrete (RC) high-rise framed structures subjected to earthquake loading under different seismic zones. The primary objective of the work is to evaluate the influence of plan dimensions and structural configuration on the seismic response of multi-storey RC buildings. For the present investigation, six analytical models were considered and classified into Part A and Part B configurations. The Part A models were developed with plan dimensions of 34 m × 38 m, while the Part B models were modeled with dimensions of 44 m × 38 m. All the building models were maintained with a uniform height of 37.3 m and configured as UG + G + 7 storeys in order to maintain consistency during comparative analysis.

The analytical modelling and seismic analysis were carried out using ETABS software in accordance with the provisions of IS 1893 (Part 1): 2016 [17]. The structures were modeled as RC framed buildings using M40 grade concrete and HYSD Fe-500 reinforcement. The analysis was performed for Seismic Zone II, Zone III, and Zone IV considering Type II medium soil conditions [17]. Various structural response parameters such as storey displacement, storey drift, base shear, and base reaction were evaluated to study the seismic behaviour of the models.

The results obtained from the analysis indicate that the displacement and storey drift values increase progressively with the increase in seismic intensity from Zone II to Zone IV. The maximum storey displacement observed in the study was 272.198 mm for the Part A model under Zone IV conditions, whereas the corresponding displacement for the Part B model was found to be 175.514 mm. Similarly, the maximum storey drift recorded for the Part A model was 0.010253, while the Part B model showed a comparatively lower drift value of 0.006638 under the same loading condition. The base shear values also increased significantly with seismic zone intensity. For the Part A model, the base shear increased from 4405.96 kN in Zone II to 9913.42 kN in Zone IV, whereas the Part B model exhibited higher base shear values ranging from 10874 kN to 24466 kN due to larger seismic weight and plan dimensions.