GRD Journals- Global Research and Development Journal for Engineering | Volume 6 | Issue 6 | May 2021 ISSN- 2455-5703
Effect of Various Lateral Load Resisting Systems on Buildings with Flat Slab Systems Doi Gulam Ashraf. F Department of Civil Engineering Sankalchand Patel College of Engineering (SPCE), Visnagar
Ashutosh D. Patel Department of Civil Engineering Sankalchand Patel College of Engineering (SPCE), Visnagar
Abstract This Study presents the performance of Flat Slab System when constructed with different lateral load resisting systems when located in high seismic area. Lateral load resisting system includes RC Shear wall and Bracings. Different types of Bracings like V type bracing, Inverted V type bracing, X type bracing and Buckling Resistant Bracing as well as Shear wall at different location is used and parameter such as Lateral Displacement, Storey Drift, Storey Stiffness and Storey Shear are been compared. Analytical model has been worked out in ETABS Software and performance of Flat slab with lateral load resisting system is examined. Keywords- Shear Wall, Bracings, Story Drift, Displacement, Story Shear, ETABS
I. INTRODUCTION In design and engineering practice, the selectively defined design of space, design of structure, speed and efficiency. The system consist of column resting directly on floor slab for which sufficient strength ductility should be provide. The absence of beamex the transferring of their role to the floor RC structure which gain in height and density of reinforcement in the part of hidden beam, the bearing capacity of the structural system. In the 1950s, flat plate construction-particularly for medium to high-rise office and residential buildings. Reinforced concrete flat plate construction has been and continuous to be used as an economical structural for many buildings. This system is suitable to resists gravity load but its seismic response is very poor. In high seismic regions, Flat plate structures are connect with either a beam-column moment frame or shear wall or bracing lateral resisting system. In the present report behavior of flat slab combined with shear wall and bracings subjected to lateral loading is studied using linear static co-efficient method. Building Systems a building following sub structure system to transfer the different types of loads. – Horizontal Sub Systems – Vertical Sub System – Lateral Sub Systems for High Rise Buildings A. Horizontal Sub Systems Horizontal sub system consists of structural elements such as Slab, Beams and small elements like drop panels in case of beamless floor or flat slab. These elements are monolithically casted so as to jointly resist the effects of applied loads (both gravity as well as lateral loads). Horizontal sub systems are of different types as slab-beam, flat plate, flat slab, waffle slab, grid floor, prestressed concrete slab etc. B. Vertical Sub Systems Vertical sub system collects the loads from the horizontal sub system and transmits it to earth through foundation. Column lies under this system. C. Lateral Sub Systems Vertical sub system collects the loads from the horizontal sub system and transmits it to earth through foundation. Column lies under this system. D. Flat Slab Flat slab buildings are very common now a days. Flat slabs with drop panels and column are commonly constructed as extra projections provide protection against punching shear and also decrease the heavy negative moment. If drop panel is not provided then that system is called Flat Plate system. In the 1985 Mexico City earthquake, 91 flat plate buildings collapsed and 44 were severely damaged due to punching failure. Punching shear strength of slab-column connection is of importance which is depends upon the gravity shear ratio. Exterior slab-column connections behave differently than interior slab-column connections. When flat slab is subjected to lateral load every joint transfer the moment. When it is subjected to gravity loads only then edge and corner column transfer moment and interior column may transfer moment when it is subjected to pattern loading or when span lengths are unequal. All rights reserved by www.grdjournals.com
72