Analysis and Comparison of Diagrid and Conventional Structural System

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International Research Journal of Engineering and Technology (IRJET) Volume: 03 Issue: 09 | Sep-2016

www.irjet.net

e-ISSN: 2395 -0056 p-ISSN: 2395-0072

ANALYSIS AND COMPARISON OF DIAGRID AND CONVENTIONAL STRUCTURAL SYSTEM RINJU JOSE PG student, Department of Civil Engineering, Indhira Gandhi college of Engineering and Technology for Women, Nellikuzhy, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------contributed to drive residential buildings upward. As Abstract - The rapid growth of urban population the height of building increase, the lateral load resisting and limitation of available land, the taller structures are preferable now a day. So when the height of structure system becomes more important than the structural increases then the consideration of lateral load is very much system that resists the gravitational loads. The lateral important. For that the lateral load resisting system becomes load resisting systems that are widely used are: rigid more important than the structural system that resists the frame, shear wall, wall-frame, braced tube system, gravitational loads. Recently the diagrid structural system is outrigger system and tubular system. Recently, the widely used for tall buildings due to its structural efficiency diagrid – Diagonal Grid – structural system is widely and aesthetic potential provided by the unique geometric used for tall steel buildings due to its structural configuration of the system. Diagrid is a particular form of efficiency and aesthetic potential provided by the space truss. It consists of perimeter grid made up of a series of unique geometric configuration of the system. triangulated truss system. Diagrid is formed by intersecting The diagrid systems are the evolution of braced the diagonal and horizontal components. In my study, analysis of diagrid structural system and conventional structural tube structures, since the perimeter configuration still system for 20storey building is considered. A regular floor plan holds for preserving the maximum bending resistance of 40 m × 40 m size is considered for both structures. ETABS and rigidity, while, with respect to the braced tube, the software is used for modelling and analysis of structural mega-diagonal members are diffusely spread over the members. Comparison of analysis results in terms of storey façade, giving rise to closely spaced diagonal elements drift, displacement ,storey shear and also the economical and allowing for the complete elimination of the aspect are to be studied. conventional vertical columns. The major difference between a braced tube building and a diagrid building Key Words: Diagrid, Conventional Structural System, E-TABS, Optimum Angle, Diagonals, Tracking Nodes, is that, there are no vertical columns present in the Axial force. perimeter of diagrid building, whereas in braced tube building there are vertical column present in the 1.INTRODUCTION perimeter of the building. Therefore the diagonal members in diagrid structures act both as inclined Tall buildings emerged in the late nineteenth columns and as bracing elements, and carry gravity century in the U.S.A. They constituted a so‐called loads as well as lateral forces; due to their triangulated “American Building Type,” meaning that most configuration, mainly internal axial forces arise in the important tall buildings were built in the U.S.A. Today, members, thus minimizing shear racking effects. The they are a worldwide architectural phenomenon. Many term “diagrid” is a combination of the words “diagonal” tall buildings are built worldwide, especially in Asian and “grid” and refers to a structural system that is countries, such as China, Korea, Japan, and Malaysia. single‐thickness in nature and gains its structural Based on data available and published in the 1980s, integrity through the use of triangulation. Diagrid about 49% of the world’s tall buildings were located in systems can be planar, crystalline or take on multiple North America. Diagrid structures represent the most curvatures. They often use crystalline forms or popular and featuring solutions for tall buildings of the curvature to increase their stiffness. Perimeter diagrids new millennium, a sort of signature element of the normally carry the lateral and gravity loads of the latest design practice. Both in the case of prismatic, building and are used to support the floor edges. regular buildings, and in the case of complex, nonconventional forms, the diagrid concept offers the 1.1 OBJECTIVE OF THE STUDY structural possibility of combining high efficiency and Safety and minimum damage level of a aesthetic connotation. The high cost of land, the desire structure could be the prime requirement of high rise to avoid a continuous urban sprawl, and the need to buildings .To meet these requirements, the structure preserve important agricultural production have all © 2016, IRJET

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