Seismic Respomse Evaluation of G+9 Residential Building in Different Seismic Zones of Bangladesh with and without Shear Wall According to BNBC 2020

Abstract

Bangladesh is located in a seismically active region and the ground shakes during an earthquake. As a result, the base of a building experiences movement. Therefore, it is necessary to ensure that structures are adequately designed to resist horizontal loads. By following BNBC guidelines the risk of failure in newly built infrastructure due to wind and earthquake loads can be minimized. According to the latest Bangladesh National Building Code 2020 (BNBC 2020), the country has been divided into four seismic zones: Zone-I (low seismic intensity), Zone-II (moderate), Zone-III (severe) and Zone-IV (very severe). Each zone has a different seismic coefficient. This paper compares seismic zone analysis of a multi-story (G+9) residential building across all four seismic zones, both with and without shear walls. The main objective is to examine how the building responds to earthquakes under the updated seismic zoning and to evaluate the effects of shear wall placement. Four locations representing the four seismic zones are considered: Rajshahi (Zone-I), Dhaka (Zone-II), Rangpur (Zone-III) and Sylhet (Zone-IV). Structural analysis is carried out using ETABS (Extended Three-Dimensional Analysis of Building Systems), focusing on story displacement, drift, stiffness and other key parameters. The results show that incorporating shear walls has a significant effect on building design, reducing displacement and improving overall structural stability.