Seismic Analysis of I Shaped and Plus Shaped Building with and without damper

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2348
Seismic Analysis of I Shaped and Plus Shaped Building with and
without damper
Prof. G.C Jawalkar1, Ms. Mariya Royali2
1Prof. Ganesh C. Jawalkar, Department of Civil Engineering, N.B.N. Sinhgad College of Engineering, Solapur
2PG Student Ms. Mariya Royali, Department of Civil Engineering, N.B.N. Sinhgad College of Engineering, Solapur
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Abstract - Earthquakes are the largest natural hazard in
damaging the structures. The structural response control is
necessary to create the safer structures against earthquakes.
The fluid viscous dampers (FVD) are themoreappliedtools for
controlling responses of the structures. Thesetoolsareapplied
based on different construction technologies in order to
decrease the structural responses to the seismic excitation.
Key Words: Seismic Analysis, Damping, Dampers,IShaped
Building, Plus Shaped Building, Fluid Viscous Dampers,
Displacement, base Shear.
1. INTRODUCTION
Increase in population in urban areas leads to increase in
high rise buildings. In the present years earthquakes are the
main natural hazardsindamagingthestructures.Earthquake
cause ground vibration due to the sudden release of energy.
The devastative effects of the recent earthquakes such as
Northridgeearthquake (1994),Kobeearthquake(1995),and
Taiwan earthquake (1999) on the buildings of the cities
adjacent to fault, and with regard to the close location of
many of the cities of India to the active faults indicate the
significance of the research. Over the recent years, the
research studies concentrated on the study of impacts of
ground motion in the near-field earthquake on thestructural
performance. The retrofitting of an existing building is a
dominant task in decreasing seismic risk. The aim of
improving the capacity of building leads to invention of new
techniques for earthquake resistant structures. There are a
number of passive energy dissipating devices in use, such as
metallic dampers, frictiondampers,viscousfluiddamperand
visco-elastic dampers totacklewithdamagingseismicforces.
1.1 Dampers
Dampers are the devices used to absorb or dissipate the
structure’s vibration from theearthquake andtoincreasethe
structure’s damping and stiffness. Dampers system are
designed and manufactured to protect structure integrity,
control structural damage and prevent resident injury
through the absorption of seismic energy and reduction of
structural deformation.
The fluid viscous dampers (FVD) are the more applied tools
for controlling responses of the structures. These tools are
applied based on different constructiontechnologiesinorder
to decrease the structuralresponsestotheseismicexcitation.
Fig-1 Longitudinal Section of Fluid Viscous Damper
1.2 Seismic Analysis
Seismic analysis is a major tool in earthquake engineering
which isused to understand the response of buildings due to
seismic excitations in a simpler manner. In the past the
buildings were designed just for gravity loads and seismic
analysis is a recent development. It is a part of structural
analysis and a part of structural design where earthquake is
prevalent.
There are different types of earthquake analysis methods.
Some of them are as follows:
1) Equivalent Static Analysis
2) Response Spectrum Method
1.3. Methodology and Modeling
Aim: To compare the seismic response of multi-storey
building of varying heights, with and without the use of
viscous dampers, using seismic coefficient method.
Methodology: I Shaped and Plus Shaped Buildings of 9
Storeys are considered. The modeling of these buildings is
done and fluid viscous dampers are applied on corners of
building. Seismic analysis is carried out using seismic
coefficient method. Thereafter, both the models are
compared for displacement and base shear.

Modeling of buildings:
.
Fig -3: 3d view of G+8 I Shaped building
Fig -4: Plan of G+8 Plus Shaped Building
Fig -5: 3d view of G+8 Plus Shaped Building
2. RESULTS
i. I Shaped Building
The I Shaped building has been analyzed for parameterslike
displacement and base shear and the result tables and
graphs are as follows:
a. Displacement
Displacement in mm (X-direction)
Storey
Without
Damper
With Damper
Percentage
Reduction %
1 2.01 1.07 46.46
2 4.49 2.04 54.55
3 7.37 3.62 50.84
4 10.56 5.47 48.15
5 13.6 7.51 44.79
6 16.33 9.56 41.43
7 18.63 10.83 41.85
8 20.4 11.5 43.59
9 21.86 12.2 44.19
Table 1: Displacement in X-direction
Fig -2: Plan of G+8 I Shaped Building

Graph 1: Displacement in X-direction
Displacement in mm (Y-direction)
Storey
Without
Damper
With Damper
Percentage
Reduction %
1 2.58 1.09 57.62
2 5.6 2.11 62.38
3 8.96 3.58 60
4 12.34 5.25 57.41
5 15.54 7.42 52.2
6 18.43 9.81 46.76
7 20.87 11.73 43.77
8 22.71 13.64 39.93
9 23.83 15.37 35.52
Table 2: Displacement in Y-direction
.
Graph 2: Displacement in Y-direction
b. Base Shear
Base Shear in KN-mm
Without Damper With Damper
Percentage
Reduction %
34435.83 8554.014 75.15
Table 3: Base Shear
Graph 3: Base Shear
ii. Plus Shaped Building
The Plus Shaped building has been analyzed for parameters
like displacement and base shear and the result tables and
graphs are as follows:
a. Displacement
Displacement in mm (X-direction)
Storey
Without
Damper
With
Damper
Percentage
Reduction
%
1 2.97 1.34 54.88
2 4.34 2.24 48.38
3 7.47 3.86 48.32
4 10.7 5.83 45.51
5 13.78 7.96 42
6 16.55 10.12 38.85
7 18.88 12.25 35.11
8 20.67 14.29 30.86
9 21.92 16.2 26.09
Table 4: Displacement in X-direction

Graph 4: Displacement in X-direction
Displacement in mm (Y-direction)
Storey
Without
Damper
With Damper
Percentage
Reduction %
1 3.21 1.25 61.07
2 5.54 2.34 57.74
3 8.99 4.06 54.87
4 12.36 5.98 51.56
5 15.53 8.03 48.3
6 18.39 10.09 45.09
7 20.8 12.12 41.72
8 22.6 14.1 37.61
9 23.69 16.01 32.4
Table 5: Displacement in Y-direction
Graph 5: Displacement in Y-direction
b. Base Shear
Base Shear in KN-mm
Without
Damper
With Damper
Percentage
Reduction %
31695.16 8713.901 72.5
Table 6: Base Shear
Graph 6: Base Shear
3. CONCLUSIONS
In the present study, the I Shaped and Plus Shaped Buildings
with and without dampers are compared and the following
conclusions can be drawn from it:
1. I Shaped and Plus Shaped Buildings with dampers placed
at corners are having lower values of displacement andbase
shear as compared to buildings without dampers.
2. The values of percentage reduction for displacement goes
on decreasing from bottom storey to top storey in both the
building models except in Storey 2 of I Shaped building.
3. The Base Shear is reduced up to 75.15% and 75.5% in I
Shaped and Plus Shaped Buildings respectively after the
application of dampers.
4. When dampers are applied to the buildings, there is an
average reduction of about 50-70 % in displacement and
base shear in both the building models.
5. The shape of the building model influences the structural
response of building.
6. Structures with dampers can be used for high rise
buildings for gaining strength and stability in high seismic
zone

REFERENCES
[1] Pramod Badole, Sumit Singh Shekhawat, “Seismic
analysis of normal rcc multistoried building with
damper and isolators using sap software”, International
Research Journal of Engineering and Technology
(IRJET), Volume: 08 Issue: 10 | Oct 2021.
[2] Alireza Heysami, “Types of Dampers and their Seismic
Performance during an Earthquake” Current World
Environment Vol. 10(Special Issue 1), 1002-1015, 2015
[3] Raheel Kazi, P. V. Muley, P. Barbude,”Comparative
Analysis of a Multistorey Building with and without
Damper” International Journal of Computer
Applications, ISSN 0975 – 8887, 2014.
[4] Durgesh C. Rai, “Future trends in earthquakeresistant
design of structures” current science, VOL. 79, NO. 9,
2000.
[5] Waseem Khan, Dr.SaleemAkhtar&Aslam Hussain,”Non-
linear time history analysis of tall structures for seismic
load using damper” International Journal of Scientific
and Research Publication, Volume 4, Issue 4,April-2014
[6] IS. 456. Indian Standards (plain and reinforcedconcrete
code of practice), (Fourth Revision), 2000
[7] IS: Indian Standards Criteria For Earthquake Design of
Structures, 1893-2002.

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