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International Research Journal of Engineering and Technology (IRJET)

e-ISSN: 2395-0056

Volume: 11 Issue: 10 | Oct 2024

p-ISSN: 2395-0072

www.irjet.net

ANALYSIS OF HIGH RAISED STRUCTURE IN TWO DIFFERENET SEISMIC ZONES WITH DIAGRID SYSTEM AND SHEAR WALL SYSTEM M.V.R.PRANEETH1, Ms P. ANUSHA2 1PG Scholar in Civil Engineering, Amrita Sai Institute of Science and Technology, Paritala, Andhra Pradesh 521180,

India.

2Assistant Professor in Civil Engineering, Amrita Sai Institute of Science and Technology, Paritala, Andhra Pradesh

521180, India. -------------------------------------------------------------------------***-----------------------------------------------------------------------Abstract: Urbanization has led to a surge in high-rise construction due to limited land availability and high costs in cities. As building heights increase, the significance of lateral load-resistant systems surpasses that of gravity load-resistant systems. Among these, diagrid and shear wall systems are prominent due to their cost-effectiveness, aesthetic appeal, and performance. Recently, diagrid systems have gained popularity because of their structural efficiency and distinctive geometric design. This study presents a comparative analysis of high-rise buildings with different lateral load-resisting systems. Two 36storey models were analyzed: one incorporating a diagrid system and the other utilizing a shear wall system. All other building parameters were kept constant. The models were evaluated for seismic performance in zones II and IV with medium soil conditions, following the guidelines of IS 1893 (Part 1): 2002, using ETABS software. Key performance metrics such as maximum storey displacement, storey drift, and storey stiffness were examined and compared between the two systems. The analysis provides insights into the relative effectiveness of diagrid and shear wall systems in high-rise buildings. Keywords: High-rise buildings, Lateral load-resistant systems, Diagrid system, Shear wall system, Seismic analysis, Storey displacement, Storey drift, Storey stiffness, ETABS, IS 1893 (Part 1): 2002.

I. Introduction The rapid urbanization and increasing demand for high-density development have led to the construction of tall buildings, where robust lateral load-resisting systems are essential for ensuring safety and structural integrity under seismic and wind loads[1,2]. Among the various strategies employed, the outrigger and belt truss system is recognized as particularly effective in enhancing the lateral stiffness and stability of tall buildings [3,4].The outrigger and belt truss system works by connecting external columns to a central core wall through stiffened outriggers and belt trusses at different levels of the building[5,6]. This system can be configured in various ways, with the core either centrally located and connected to outriggers on both sides, or positioned asymmetrically with outriggers extending to the building's columns on one side[7,8]. The core's connection to the external columns through outriggers and belt trusses effectively transforms the building into a unified structure that can resist lateral forces more efficiently[9,10]. The primary function of the outrigger beams and belt trusses is to tie the central core to the peripheral columns, significantly enhancing the building's resistance to lateral loads by reducing drift and minimizing the risk of both structural and non-structural damage [1,11]. The belt truss ties the exterior columns together, while the outriggers engage these columns with the central core, helping to resist overturning moments through the development of a tensioncompression couple in the perimeter columns[13,14].In a conventional outrigger system, outrigger trusses are directly connected to shear walls or braced frames at the core, providing direct resistance to lateral forces[15]. This system functions similarly to virtual outrigger systems, where rigid floor diaphragms transfer moments from the core to the trusses and eventually to the exterior columns[16]. The diaphragms, being inherently stiff and strong within their plane, resist core rotation, converting part of the core's moment into a horizontal couple within the floors[17]. This horizontal couple is then transferred through the truss chords and converted into vertical forces at the exterior columns, further contributing to the building's lateral stability[18]. Additionally, basement walls and belt trusses can also act as effective virtual outriggers, providing similar benefits in terms of moment distribution and resistance to lateral forces[19, 20]

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