These days performance of a high rise building during strong earthquake motions depends on the distribution of stiffness, strength and mass along both the vertical and horizontal directions. If there is discontinuity in stiffness, strength and mass between adjoining storeys of a building then such a building is known as irregular building. Modern residential structure are going higher and higher these days. The impact of lateral loads in the form of wind/Earthquakes affects the performance of these structures dramatically. It is often a common practice among structural engineers to use shear walls in place of columns. In the present study, review of G+10 multi-storey building with and without setback is carried out. Structural members are designed according to IS456-2000. The structure is analyzed by using ETABS v 9.7.1 software. Load consideration is based on Indian code. All necessary load combinations are considered in shear walls analysis and frame analysis. In addition wind load, seismic load is considered as external lateral load in the dynamic analysis. In dynamic analysis; Response Spectrum method is used. The values of story drift, story shear, story bending, time period, frequency and model stiffness values are compared for regular and irregular buildings.
Key words: seismic, irregular buildings, vertical set back