International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 08 | Aug 2025
p-ISSN: 2395-0072
www.irjet.net
Seismic Analysis of a G+21 High-Rise Building Using Bhuj Earthquake Response Spectrum Data with Shear Wall Position Optimization ER. SAMIR KUMAR SINGH Asst. Manager, Design Departments, UMSL Limited, Bhubaneswar, Odisha ---------------------------------------------------------------------***--------------------------------------------------------------------Shear walls are vertical structural elements designed to Abstract - This study presents a simulation-based analysis of a high-rise (21+G floor) reinforced concrete building. The simulations were carried out using ANSYS 17.2 software, utilizing its "Static Structural", "Modal", and "Response Spectrum" tools to evaluate the performance of the building under various loading conditions.
resist lateral forces parallel to their plane, such as those from wind or earthquakes. In slender walls, they resist loads through cantilever action. They act as rigid vertical diaphragms, transferring lateral loads from floors, roofs, and walls to the foundation.
The structural response of the building was analysed under dead load (DL) and live load (LL) using the Static Structural tool. The Modal analysis was performed to determine the natural frequencies and vibration modes of different shear wall orientations. Finally, seismic performance was assessed through Response Spectrum Analysis, simulating ground excitation forces to evaluate earthquake resistance.
These walls are critical in high-rise buildings to control lateral displacement and resist torsional forces caused by wind, seismic activity, or uneven settlement. Shear walls are generally plane or flanged in section, while core walls often have channel sections. Their position and shape significantly affect building behaviour. Structurally, the ideal location is central in each half of the building, but due to space constraints, they are often placed at ends, around lift shafts, stairwells, or windowless side walls to minimize openings and maintain stiffness.
The focus of this research is to determine the most effective orientation of shear walls to optimize the lateral resistance of the structure. Five different shear wall configurations were modelled and compared for their performance under seismic loading. The building analyzed has a total height of 128.7 m, with dimensions of 60 m x 30 m and total floor area of 52636.5 m². Key structural elements include M30 concrete columns (1 m × 1.2 m), beams (1.2 m × 1.2 m), slab thickness of 0.15 m, and shear walls of 0.15 m thickness.
1.1 OUTLINE OF THE MODEL In my simulation, I am analyzing a tall, frame-structured building with an oval shape. The oval form has been chosen as it is optimized to reduce wind forces acting on the building surface, as supported by the findings in the paper "TallBuilding Structure Shape Optimization using Computational Fluid Dynamic (CFD)." [1] The building consists of 21 floors above a ground floor (21+G), with an overall height of 128.7 meters. It has a length of 60 meters and a width of 30 meters, resulting in a total floor area of 52,636.5 m².
This study highlights the importance of strategic shear wall placement in tall buildings to enhance structural stability under lateral loads such as wind and earthquakes. The results provide guidance for optimal shear wall design and contribute to safer and more resilient high-rise structures.
Each floor has a height of 5.85 meters, while the structural columns are 4.5 meters tall and spaced 10 meters center-tocenter. The building features slabs with a depth of 0.15 meters, columns measuring 1 meter by 1.2 meters, and beams with dimensions of 1.2 meters by 1.2 meters. Shear walls are also included, each with a thickness of 0.15 meters.
Key Words: Shear wall orientation, tall building simulation, ANSYS 17.2, Response spectrum analysis, Earthquake resistance, High-rise structure, FEM. 1.INTRODUCTION I am using ANSYS 17.2 software for simulation work. For analysing dead load (DL) and live load (LL) on a tall building, I use the Static Structural tool. To determine the natural frequencies of different building types, I use the Modal tool. Finally, earthquake analysis is performed using the Response Spectrum tool.
M30 grade concrete is used for all structural components, with a density (ρ) of 2400 kg/m³ and a Poisson’s ratio (µ) of 0.15. The simulation considers an environmental temperature of 22°C.
The aim of this simulation is to identify the best orientation of shear walls to resist ground excitation forces. For this purpose, five different shear wall orientations are considered.
In my simulation, I am using the computed response spectrum data from the Bhuj Earthquake to analyse the seismic performance of the tall building. The earthquake event occurred on 26th January 2001 at 08:46:42.9 IST, with
© 2025, IRJET
|
Impact Factor value: 8.315
1.2 Earthquake Data
|
ISO 9001:2008 Certified Journal
|
Page 381