International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 06 | Jun 2024
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p-ISSN: 2395-0072
Seismic Analysis of Mass Irregularity and Stiffness Irregularity of G+20 Tilting Building Kaushal Basaraf1, Sanket Ghungrad2, Vedant Shinde3, Sandip B. Chavan4, Mayuri Ahirrao5 1Student, JSPM's Rajarshi Shahu College of Engineering, Tathawade, Pimpri-Chinchwad, Maharashtra, India 2Student, JSPM's Rajarshi Shahu College of Engineering, Tathawade, Pimpri-Chinchwad, Maharashtra, India 3Student, JSPM's Rajarshi Shahu College of Engineering, Tathawade, Pimpri-Chinchwad, Maharashtra, India
4Professor, JSPM's Rajarshi Shahu College of Engineering, Tathawade, Pimpri-Chinchwad, Maharashtra, India 5Professor, JSPM's Rajarshi Shahu College of Engineering, Tathawade, Pimpri-Chinchwad, Maharashtra, India
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Abstract - Vertical irregularities, including uneven mass
distribution and variations in stiffness, pose significant challenges for buildings in seismic zones. This study investigates how lateral forces generated by earthquakes affect each level of a building with an uneven vertical structure to evaluate their influence on the building's response. The study adopts the IS 1893:2016 (Part 1) guidelines due to their established standards in seismic analysis and design. The results show that uneven mass distribution causes strong sideways forces and instability in the structure, highlighting the crucial need for accurate mass placement to lower earthquake risks. Additionally, the study finds that buildings with an uneven stiffness distribution are more susceptible to torsional effects during seismic events, further increasing the risk of structural failure. By following the guidelines set forth in IS 1893:2016 (Part 1), engineers can better design buildings to withstand lateral forces and reduce the potential for damage. Overall, this research emphasizes the importance of considering both mass and stiffness distribution in seismic design to ensure the safety and stability of buildings in earthquake-prone areas. This approach can help save lives and reduce the economic impacts of future earthquakes.
Fig 1.1: Total horizontal earthquake force in building increases downwards along its height 1. The study could further discuss the specific methods used to intentionally alter the mass properties of the G+20 building in order to create vertical mass irregularities for testing purposes. 2. It would be interesting to explore how the altered mass distribution affects the load-bearing capacities of different sections of the building and what implications this has for structural stability during seismic events.
Key Words: Seismic design, vertical irregularities, mass distribution, stiffness distribution, earthquake resilience
3. The research could delve into how engineers and architects can mitigate potential risks associated with asymmetrical mass distribution in buildings, especially when designing structures in seismically active regions.
1. INTRODUCTION Significant earthquakes have exposed vulnerabilities in various structures, often leading to damage or collapse. Regularly shaped buildings generally perform better during seismic events due to their symmetrical distribution of mass, which helps in maintaining uniform load-bearing capacities and structural stability. However, irregularities such as asymmetrical mass distribution can cause uneven load distribution, which in turn may lead to critical structural failures, compromising the overall stability of the building. This study focuses on a G+20 building with vertical mass irregularities to assess how it reacts to lateral seismic loads. The irregularities are created by intentionally altering the mass properties, such as increasing mass at specific levels, to introduce vertical mass irregularities in accordance with the IS 1893:2016 guidelines.
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4. Further analysis could be conducted on how different types of irregularities, beyond just vertical mass irregularities, impact a building's ability to withstand lateral seismic loads and maintain structural integrity. 5. The study may also investigate real-life examples of buildings that have experienced structural failures due to uneven load distribution, highlighting the importance of considering these factors in construction design and planning processes.
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