SEISMIC ANALYSIS OF IRREGULAR RC FRAME BUILDINGS WITH SPECIAL 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 the seismic analysis of irregular RC frame using special shaped columns
considering both plan and stiffness irregularity.This study also finds out the effects on various parameters of RC
buildings under seismic occurance due to special shape of columns. The parameters considered are lateral displacement
and story drift. The software used for modelling and analysis is ETABS 2015.