Different Orientation of Shear Wall In A Reinforced Concrete Building To Control Drift and Deflection

Abstract

In recent times, the construction of high-rise buildings and skyscrapers are becoming the norm in modern cities. However, there is a growing concern about whether the building designs are efficient in developing countries like Bangladesh which lies on the tectonically active Himalayan orogenic belt and is considered one of the high earthquake risk zones. Dhaka has more high-rise buildings than any other cities in Bangladesh, and it is critical to control the lateral loads that cause seismic hazards to the towering structures. Shear wall systems are one of the most feasible and commonly deployed solutions for resisting lateral loads. It can induce eccentricity in a structure, which is the primary source of torsion. This study has attempted to determine the correct orientation and placement of shear walls in a regular G+15 story reinforced concrete building to observe the nature of the structure exposed to the earthquake by adopting Equivalent Static Analysis. The computer application program CSi ETABS 2019 analyzed the drift, displacement, stiffness, story shear, torsional irregularity and compared eight models with different shear wall placements. The analysis featured the seismic zone II and soil type D according to the BNBC 2020 guideline. Results reveal that shear walls placed symmetrically and along the shorter span for the selected structural plan have shown less lateral drift and displacement than structures with other shear wall orientations.