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 STUDY ON SEISMIC PERFORMANCE OF PLAN IRREGULAR BUILDING WITH DIFFERENT STRUCTURAL SYSTEMS Yashvantsinh Thakor1, Aakash Suthar2 1MTech student L.J University, Ahmedabad
2 Aakash Suthar, Assistance professor, Civil Engineering Department, L.J University, Ahmedabad, India
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Abstract – Nowadays, we often see tall structures in
symbolizing progress, innovation, and architectural prowess. Modern skyscrapers integrate residential, commercial, and recreational spaces, fostering vibrant communities.
metropolitan cities like Mumbai, Delhi, Bangalore, etc which are growing at high speed with our country as a developing nation. The point here is need of tall structures with increasing scarcity of lands in big city and appropriate structural systems for this kind of tall structures which can help our structure to withstand against strong wind and earthquake forces. Also with the increasing height of structures architects are also raising the bar of aesthetics of buildings. As the architects are going with more and more unconventional or irregular type of building from the aesthetic point view it increases the vulnerability of structures against seismic forces. To counteract this kind of situation we need special structural system which gives better stability to the structure and also can be suitably used for designing irregular type of structures ass per today’s requirements. Hence, in this research we are going to study the seismic behavior of horizontally plan irregular building. We will be evaluating special structural systems like Shear walls, Framed tube, Tube in tube structural systems against earthquake forces with the help of Etabs software. We will be using Response Spectrum method for seismic analysis of G+40 storey building having different structural systems.
So far, many researchers had studied the effect of irregularities on the seismic performance of structure. Abraham, N.M. and SD, A.K. (2019) investigated seismic behavior of 9 storey building with different irregularities also including combination of irregularities by using Time history analysis. They had concluded that buildings having combination of stiffness and vertical geometric irregularities are more susceptible to earthquake forces whereas the combination of re-entrant corner and vertical geometric irregularities has shown lesser effect of earthquake forces. Krishnan, P.A. and Thasleen, N.(2020) studied the seismic analysis of RCC buildings with plan irregularities mainly focusing on re-entrant corners type of irregularity. They observed High stress concentrations at all the re-entrant corners in the various models whereas columns and other members closer to the re-entrant corners were found to fail first. Firdose, H.A., Kumar, A.S., Narayana, G. and Narendra, B.K.(2022) studied the dynamic behavior of irregular reinforced concrete structures with different locations of shear walls in G+17 story building model. They found that shear wall is one of the best methods for the R.C frame irregular plans. Shear walls at corners is found as the best optimum location and positioning of shear walls. To, T.I., (2022) studied the seismic performance of framed, frame tube and tube-in-tube structures of G+39 and G+29 stories using Response Spectrum method. According to the authors tube-in-tube structural system is most effective in resisting lateral loads as tube-in-tube structures performed best with the least displacements followed by the framed tube.
Key Words: Tall structures, Irregular building, structural systems, earthquake forces, MRF structure, shear wall, Framed tube structure, Tube in tube structure.
1.INTRODUCTION Tall buildings play a crucial role in today’s urban landscape for several reasons:
Space Optimization: As cities grow, land becomes scarce. Tall buildings allow us to maximize space vertically, accommodating more people and activities within limited areas. Population Density With increasing urbanization, tall structures provide housing, offices, and amenities for a densely populated world.
Hussain, M., Hussain, L., Maher, A. and Zaidi, S.A.,(2020) carried out a comparison of four different types of tubular structural frames with varying column spacing of 7.5 ft, 10 ft, 15 ft, and 30 ft in the periphery of the 60 storey building. They concluded that tubular frame with 10 ft column spacing is the most optimal and economical solution compared to other tubular and moment-resisting frame structures. Revankar, N. and Fernandes, R.J., (2021) studied the
Sustainability: Vertical growth reduces urban sprawl, minimizing the need for extensive transportation networks and preserving natural habitats. Tall buildings define city skylines,
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