PUSHOVER ANALYSIS OF PLAN IRREGULAR RC BUILDINGS WITH SOFT STORY USING SPECIAL SHAPED COLUMNS

Abstract

— Irregular buildings constitute a major portion of the modern urban infrastructure. The group of
people involved in constructing the building facilities, including owner, architect, structural engineer, contractor and
local authorities, come up with the overall planning, selection of structural system, and its configuration. This may lead
to building structures with irregularities in their mass, stiffness and strength along the height of building. When such
buildings are located in a seismically active area, the structural engineer’s role becomes more challenging. The analysis
of the seismic response of irregular buildings is complex due to nonlinear and inelastic response and more difficult than
that of regular buildings. Therefore, the structural engineer needs to have a complete understanding of the seismic
response of irregular structures. The effect of shape of column and orientation of column will have a major influence on
the structure when the structure is subjected to a lateral load such as earthquake load .
The objective of this study is to carry out nonlinear static analysis of plan irregular RC frame with vertical irregularity
in the form of soft story using special shaped columns.This study also finds out which plan irregular building is the most
effective in resisting lateral loads. The software used for modelling and analysis is ETABS 2015