Pushover Analysis of Irregular Steel Structure with Varying Irregularity Ratios
Keywords:
Irregularity ratio; plan irregularity; pushover analysis; seismic behaviour; vertical geometric irregularity.Abstract
In this paper the seismic performance of irregular steel structure with varying irregularity ratio have been investigated. For the study purpose, two different models with vertical geometric irregularity and plan irregularity according to IS 1893 (part 1) -2002 have been considered. The irregularity ratio (A/L) where A is offset and L is base width has been varied from 0.2 to 0.8. Irregular structures have been modeled using ETABS, a finite element software and plastic hinges are assigned to incorporate the inelastic seismic behaviour of structures. Performance of eleven irregular structures has been compared with regular frame structure in terms of base shear carrying capacity, roof displacement and performance point, using pushover analysis. The results indicates that as irregularity ratio increases, base shear carrying capacity and performance point of irregular structure decreases.
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