Sesimic Analysis of Structurally Irregular Framed Structure W.R.T Response Spectrum and Pushover Analysis

In the recent time we come across many structures which are irregular in shape, this type of cannot be avoided due to the functional and architectural requirements. These types of structures have irregular distribution of centre of mass and centre of rigidity which causes the torsional effect on the structures which is one of the most important factors influencing the seismic damage of the structure. Structures with asymmetric distribution of mass and rigidity undergoes torsional motions during earthquake. To assess the torsional effect on the structures in the present study four types of structures are considered with varying eccentricity subjected to Pushover Analysis and Response spectrum analysis. The performance of the structures are assessed as per the procedure prescribe in ATC-40 and FEMA-356. The analysis was carried out in STADD PRO. The results have shown that the structures is evident that structures with mass irregularity are very much affected than the vertically irregular structures. The maximum base shear, displacement and time period is experienced by G+ 3 structure.