Static Linear and Non-Linear (Pushover) Analysis of Multi Storey RC Frame with and Without Vertical Irregularities

Earthquakes are most devastating natural hazards in terms of property loss and life of any region. The response of structure during earthquake greatly depends on size, geometry and shape of the structure. The Indian code IS-1893: 2002 (Part-I) has pointed out a variety of structural irregularities like plan irregularity and vertical irregularity. The study focuses on the seismic performance of G+6 storey regular and irregular Reinforced Concrete (RC) buildings. For this purpose, a finite element computer software ETABS (V. 9.7.1) has been used. The study as a whole makes an attempt to evaluate the impact of vertical irregularity on RC buildings in terms of static linear-Equivalent Static Lateral force Method (ESLM) and nonlinear analysis (PUSHOVER). Base shear, Lateral displacement, Storey drift and Performance points are the response parameters used to quantify the performance of the structure. The analysis has been carried out for zone II and zone V of India and soil type III (soft soil) condition. Based on the above response parameters, the results and conclusions are drawn.