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Effects of earthquake load on high rise buildings are quite significant and it increases rapidly with increase in height. In high rise structures, the behavior of the structure is greatly influenced by the type of lateral load resisting system provided. This further depends on many aspects such as structural behavior of the system, economic feasibility and availability of materials. Some of the lateral structural systems are Shear wall system, Braced Frame system, Framed Tube system, Tube in Tube system and Bundled Tube system. The lateral structural systems give the structure stiffness, which would considerably decrease the lateral displacements. In the present work a Bare Frame system and Tubular Frame system are considered for 15 storey structures. Structures are analyzed using equivalent static and dynamic analysis for two types of soil and for zones ΙV and V. The analysis has been carried out using software Etabs 9.7.1. The displacements, storey drift, storey acceleration and mode shapes are studied and compared. It is seen that the Tubular Frame system is more effective in resisting lateral loads for structures having 15 storeys compared to Bare Frame system.

PARAMETRIC STUDY ON SEISMIC VULNERABILITY OF PLAN IRREGULAR RC BUILDING CONSIDERING TORSIONAL EFFECTS