Nowadays, as in the urban areas the space
available for the construction of buildings is limited. So in
limited space we have to construct such type of buildings
which can be used for multiple purposes such as lobbies,
car parking etc. To fulfill this demand, high rise buildings
is the only option available. The performance of a high rise
building during strong earthquake motion depends on the
distribution of stiffness, strength and mass along both the
vertical and horizontal directions. If there is discontinuity
in stiffness, strength and mass between adjoining storeys of
a building then such a building is known as irregular
building. The present study focuses on the seismic
performance of regular and vertical irregular building
with and without masonary infills. In the present study
G+11 building is considered for the analysis with
modelling and analysis done on ETABS software v17.0.1.
The earthquake forces are calculated as per IS 1893 (part
1): 2016 for seismic zone III. The width of strut is
calculated by using equivalent diagonal strut method.
Total five models are considered for the analysis i.e.
regular building with bare frame, regular building with
masonary infill, soft storey building with open ground
storey, mass irregular building with masonary infill and
vertical geometric irregular building with masonary infill.
The non-linear static analysis (pushover analysis) and
linear dynamic analysis (response spectrum analysis) are
performed for all the models and thereby compare their
results. From analysis, the parameters like performance
point, time period, maximum storey displacement,
maximum storey drifts, storey shears and overturning
moments are determined and also comparative study is
done for all the models. From the comparison, it is
observed that the vertical geometric irregular building
shows better performance under seismic loading and bare
frame building shows inferior performance. Moreover,
the performance of masonary infilled frame building is
f
Nonlinear Pushover Analysis of Irregular R.C. Frame Building: A Review
