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EFFECT OF INCREASED STIFFNESS AND OUTRIGGER SYSTEM ON FLAT SLAB

Recently, building structures become larger and taller to satisfy the social and economical needs. Various works have been carried out to study the behavior of these structures and increase the lateral stiffness. The advances in three-dimensional structural analysis and computing resources have allowed the efficient and safe design of increasingly taller structures. Tall buildings are being increasingly designed with structural system comprising of flat slab or flat plate system and shear wall with or without perimeter beams. The behavior of this system under lateral loads is dependent on numerous parameters such as the height of the building, floor plate size, size and location of the shear wall, flat slab spans. The flexural stiffness of floors may have some influence on the lateral response of the structure. Under lateral loading floor and roof systems in reinforced concrete buildings act as diaphragms to transfer lateral loads to the vertical lateral force resisting system. If the flexural stiffness of slabs is totally ignored the lateral stiffness of the structure may be underestimated.