Analysis of high-rise structures with different structural systems

Abstract

Recent trend of growth in population and scarcity of land has evolved an era of modern urbanization which indeed has led to the vertical growth of buildings and gave us the new trend setting structures named as High Rise Structures or Multi-Storeyed Structures. These structures are need of time due to scarceness of land, greater demand for business and residential space, economical emergence, technical advancements, innovations in structural systems and desire for aesthetics in urban area. Lateral load effects on high rise buildings are quite significant and increase rapidly with increase in height. In high rise structures, the behavior of the structure is greatly influenced by the type of lateral system provided and the selection of appropriate. The selection is dependent on many aspects such as structural behavior of the system economic feasibility and availability of materials. Few of the lateral structural systems are Shear wall system, Braced frame system, Framed tube system, Tube in tube system, Bundled tube system. The lateral structural systems give the structure the stiffness, which would considerably decrease the lateral displacements. In the present work Shear-wall system, framed tube system and tube-in-tube systems are considered for 21, 41 and 61 story structures. The analysis has been carried out using software Etabs. Earthquake Load is given in form of Spectrum load referring to IS 1893-2002 and Wind load is given as per norms of IS 875-Part III 1987. The Storey displacements, base-shear, member forces such as shear force and Bending moment in beams and columns, forces in shear-wall are also studied and compared. It is seen that the Shear wall system is very much effective in resisting lateral loads for the structures up to 20 stories and for structures beyond 20 stories the Framed tube system is very much effective than Shear wall system in resisting lateral loads.