International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 07 | July 2024
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p-ISSN: 2395-0072
A Research on Modal Analysis of Symmetric and Asymmetric Building With And Without Shear Wall Under Indian Seismic Conditions Pandya Drashti1, Aakash Suthar2, 1M. Tech Student, L.J. University, Ahmedabad
2Aakash Suthar, Head of Department, Structural Engineering Department, L.J. University, Ahmedabad, India.
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Abstract: -The torsional effects of seismic events on
stability are assessed to evaluate the overall performance and safety of the structure.
multistory buildings are critically analyzed in this research paper. The twisting motion of buildings brought on by seismic forces is known as torsional effects, and it is crucial to the structural integrity of buildings. In order to design structures that can withstand seismic activity and guarantee occupant safety, it is imperative to comprehend these effects. The study draws attention to the complexity of torsional responses and how they affect how well buildings function during earthquakes. The study examines two different models that are symmetric and asymmetric high-rise buildings with and without shear walls in their structure in different Indian seismic zones. Analysis had been carried by modelling in ETABS. It was observed that the performance of any building depends very much on the torsional behavior of the structure.
In the study of structural dynamics, modal analysis is an essential method for understanding how structures respond to vibrations. For the purpose of creating safe and effective structures, this analysis is crucial, especially in the fields of civil, mechanical, aerospace, and automotive engineering. Understanding and enhancing the vibrational characteristics of structures is made easier with the help of modal analysis, a fundamental component of structural engineering. Through the identification of inherent frequencies and mode shapes, engineers are able to create more durable and resilient structures that guarantee performance and safety in a range of applications. In conclusion, studies on the evaluation of Indian seismically vulnerable structures are essential to the preservation of infrastructure and human life. The country's varied seismic risk makes it necessary to take a nuanced approach to comprehending how different regions' buildings behave. These studies provide valuable insights that not only guide the design and construction of new buildings, but also play a major role in the development of robust building codes and retrofitting strategies. The knowledge gained from seismic research will be crucial in developing a built environment that is safer and more resilient as India continues to urbanize and grow.
Key Words: (Modal analysis), (Shear Wall), (Torsion), (Mass participation ratio), (Frequency) & (High rise).
1.INTRODUCTION: India's vast and varied terrain is marked by different degrees of seismic hazard, which makes in-depth study of the evaluation of structures in seismic zones necessary. One frequent natural hazard in the area is earthquakes, which are extremely dangerous for both infrastructure and human life. Reducing the devastating effects of earthquakes requires an understanding of how various building types react to seismic stress in various regions. India has a wide range of seismic risk, from low-risk regions to high-intensity zones near plate borders. This emphasizes the need for thorough studies to guide building procedures and retrofitting techniques.
2.Modelling: The current work can be categorized as a quantitative study since it primarily focuses on gathering numerical data for two distinct building plan configurations that are exposed to seismic loads. The analysis was carried out on reinforced concrete structures that were symmetrical and asymmetrical, measuring 38 x 38 m for square buildings and 68.5 x 48.5 m for L-shaped buildings. These plans have 13 standard stories, each measuring 3 meters in height, with a base story height of 3.5 meters. Every structural element is modeled exactly, including the placement and size of shear walls.
The study of modal analysis of structures is a fundamental aspect of structural engineering and seismic design, providing critical insights into the dynamic behavior of buildings and other constructions under various loading conditions. This analytical technique involves examining the natural frequencies, mode shapes, and damping ratios of a structure, which are essential for understanding how it will respond to dynamic forces such as wind, vibrations, and earthquakes. By identifying the primary modes of vibration and their associated mass participation factors, engineers can predict potential resonances and ensure that the structure can withstand and dissipate energy effectively. Additionally, parameters like storey drift and torsional
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