Behavior of Symmetric and Asymmetric Structure in High Seismic Zone

In the present report, at present scenario many buildings are asymmetric in elevation based on the distribution of mass and stiffness along each storey throughout the height of the building. Most recent earthquakes have shown that the irregular distribution of mass, stiffness and strengths may cause serious damage in structural systems. This project performance of the torsionally balanced and torsionally unbalanced buildings also called as symmetric and asymmetric buildings by subjecting to response-spectrum analysis. The buildings have un-symmetrical distribution of vertical irregularinstorey's. In this project the effort is made to study the effect of eccentricity between centre of mass (CM) and centre of stiffness (CR) on the performance of the buildings. Three buildings (G+3), (G+6) & (G+9) models are considered for study, which are constructed on medium soil in seismic zone II of India (as per IS:1893-2002), one symmetric and asymmetric in vertical irregular distribution. The performance of a multi-storey framed building during sturdy earthquake motions depends on the distribution of mass, stiffness, and strength in both the horizontal and vertical planes of the building. In some cases, these weaknesses may be produced by discontinuities in stiffness, strength or mass between adjoining storeys. Such discontinuities between storeys are often allied with sudden variations in the frame geometry along the height.