Analysis of Moment Resisting Reinforced Concrete Frames for Seismic Response Reduction Factor

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 10 Issue: 08 | Aug 2023 www.irjet.net p-ISSN: 2395-0072
© 2023, IRJET | Impact Factor value: 8.226 | ISO 9001:2008 Certified Journal | Page 55
Analysis of Moment Resisting Reinforced Concrete Frames for Seismic
Response Reduction Factor
Prof. Amit A. Kusanale1, Mr. Keshav Ramdas Manerikar2
1 Assistant Professor, Department of Civil Engineering, P.V.P.I.T. Budhgaon, Sangali, India
2PG Student, Department of Civil Engineering, P.V.P.I.T. Budhgaon, Sangali, India
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Abstract - Earthquake is the maximum vital factor to bear
in mind whilst designing a building is earthquakes. For the
duration of earthquakes, systems vibrate. Wind forces,
earthquakes, machine vibrations, and lots of other elements
can purpose vibrations. These vibrations can now and again
purpose structural harm, especially below sturdy earthquake
excitations. Via the use of dampers severe damage can be
averted. The idea of the viscous damper is to take in shocks
and vibrations from the shape. However, themaximumcrucial
is the place of the dampers that is a primary consideration.
The viscous damper is taken into consideration the passive
manipulate machine used to use up and take in strength
prompted at some stage in earthquakes due to earthquakes.
The principle reason of the utility of dampersisto decoratethe
stiffness and stability of the shape and make the shape
earthquake resistant. The present look at is targeted at the
study of the seismic conduct of buildings with dampers and
evaluating seismic responses to displacement and different
elements.
Key Words: (Viscous Dampers, Visco- Elastic Damper,
Displacement
1. INTRODUCTION
An earthquake is an effective shaking of the earth's surface
that can be deadly to hundreds of people and cause severe
harm. They may be delivered on through the unexpected
release of electricity from tectonic plate movements within
the Earth's crust. Seismic waves are the manner by which
this strength is discharged. The most excessive and
unanticipated herbal calamities are earthquakes. Inside the
worst scenario, the massive amount of energy produced in
the course of an earthquake might also result in serious
injury or the destruction of vital structures. Civil structures
like excessive-rise homes, skyscrapers, and lengthy span
bridges are designed with more flexibility as a result of the
speedy financial developmentandcontemporarygeneration,
which increases their susceptibility to external excitation.
Consequently, these bendy systems are vulnerable to being
uncovered to extraordinarily excessive degrees of vibration
inside the occasion of a robust wind or earthquake. With the
intention to hold such civil projects from suffering sizeable
harm, the reaction reduction of civil systemsfortheduration
of dynamic loads such massive earthquakes and excessive
winds has come to be a crucial topic in structural
engineering. The forces triggered at some point of the
earthquakes need to be resisted by way of the systems with
out suffering any important structural damage. All systems
have to be designed to withstand lateral hundredsinseveral
ways. The maximum commonplace lateral masses resisting
systems are moment frames, shear wall and braced frame.
Passive electricity dissipating structures are also used as an
alternative to seismic isolationwhichprotectsthesystemsin
opposition to the earthquakes. The application of such
structures enhances the power soaking up potential of
structures.
The maximum not unusual types of these structures consist
of fluid viscous dampers, friction dampers, tuned mass
dampers and steel dampers. In the present examine one of
the passive power dissipating gadgets is used and the
seismic behaviour of the constructing is studied.
1.1 VISCOUS DAMPERS
Viscous dampers, additionally called seismic dampers,
are hydraulic additives that diffuse kinetic strength
precipitated for the duration of earthquakes and soften
structural collisions. They may be adaptabledevicesthat can
be made to provide for every managed and out of control
dampening of systems to protect them from earthquake.
Fig -1: Viscous Dampers
1.2 VISCOELASTIC DAMPER
Viscoelastic (VE) dampers have been effectively fused in
various tall structures as a reasonable vitality scattering
framework to smother wind-and quake initiated movement
of building structures. This sort of damper disperses the
structure's mechanical vitality by changing over it into heat.

A few factors, for example, encompassing temperature and
the stacking recurrence will influence the presentation and
subsequently the viability of the damper framework. VE
dampers have had the option to expandthegeneral damping
of the structure essentially, subsequently improving the
general execution of powerfully touchy structures.
Fig -2: Viscoelastic Dampers
1.3 FLUID VISCOUS DAMPER
Fluid viscous dampers are one of the passive energy
vanishing devices, for controlling vibration caused in
structure and mechanical systems.Inmilitaryandaerospace
industry they use extensively these type of dampers from
past years now a days these are used in the buildings to
control the vibrations caused by wind and earthquakes. One
of the greatest unique capacity of the dampers is it will
together decreases both the stress and deflection within the
structure subjected to transient. Thisisbecausethedampers
vary its force only with the velocity, due to flexing of the
structure the response that is permanently out of phases
with the stresses. To vanishes the energy in the building
these dampers are used because these dampers are velocity
dependent. To reduce the responses in the building these
effective damping should be done by using these type of
dampers. FVDs are frequencyindependentdeviceswithouta
stiffness component.
2. SCOPE AND OBJECTIVE
2.1 Scope:
To perform the seismic analysis of multi storey RCC building
(G+8) with and without dampers
2.2 Objective:
 To study the behavior of structurewithandwithout
dampers
 To study and evaluate seismic responses such as
displacement. Acceleration.
 To study Time History utilizing VD and VED in
structures
3. METHODOLOGY
More than one-story structures come under the multi
Stages of freedom systems. In multi tiers of freedom
Structures the deformation of an entire shape cannot be
related by using a single displacement, more than one
Displacement coordinates are wanted to become aware of
the displaced structures.
3.1 Methods of analysis
3.1.1 Equivalent static method: An equivalent static
method is also referred to as an equal lateral pressure
method. Seismic analysis on a building is carried out on the
assumption of the horizontal pressure is just like the
dynamic loading, inside the technique durations and shapes
of higher modes of vibration aren't required so the effort for
the evaluation is much less, besides the fundamental length.
The base shear is calculated depending on the mass of the
shape, its fundamental intervals of vibration, and shapes.
First of all the bottom shear is calculated for an entire shape
then alongside the peak of the building distribution is
executed. At each ground level, the lateral force acquired is
allotted to every structural detail. This method is usually
followed for an extremely low to medium peak constructing.
3.1.2 Response spectrum method: Reaction spectrum
technique is likewise called as a modal Technique or mode
superposition technique. This method is utilized in a
structure where the modes will have an effect on the
Reaction of shape apart from the fundamental one especially
this technique used for a dynamic analysis of a Building
which can be asymmetrical in plan or irregularityinareas.In
case of multi storied homes to find the Forces and
displacements brought about because of medium variety
Earthquake movement this technique is used for evaluation.
 For the study purpose reinforced concrete
structures are considered, having G+8 stories of
height 3.1 m each Floor.
 R.C.C. regular Structure design on E-tab Software.
 The number of storey and floor height is kept
constant for all models in order to get consistent
results
 To understand the behaviour under seismic loads
the loads are applied as per IS 1893: 2002.
 Design the structure with and without dampers.

3. RESULTS AND CONCLUSION
The results are used to conclude the suitability of dampers
3.1 Displacement of Storey:
3.1.1 Storey Response Displacement in mm in x-
direction for G+ 8
Table no 1: Storey Response Displacement
Storey
Elevation
(m)
Displacement
(mm)
without
dampers
Displacement
(mm)
With dampers
X-Dir X-Dir
8 24.8 44.17 25.62
7 21.7 41.15 23.03
6 18.6 39.71 22.12
5 15.5 35.13 20.25
4 12.4 32.75 19.25
3 9.3 31.95 18.53
2 6.2 22.04 12.78
1 3.1 10.03 5.82
0 0 0 0
Fig -3: Graph of Story Response x direction
Table no 2: Storey Response Displacement
Storey
Elevation
(m)
Displacement
(mm)
without
dampers
Displacement
(mm)
With
dampers
Y-Dir Y-Dir
8 0 39.97 23.58
7 3.1 37.74 20.85
6 6.2 35.34 19.15
5 9.3 32.15 18.15
4 12.4 29.62 17.15
3 15.5 27.47 16.21
2 18.6 19.99 11.79
1 21.7 9.24 5.45
0 24.8 0 0
Fig -4: Graph of Story Response y direction
a) The graph shows displacement v/s height of the
building for G + 8 building with dampers applied at
alternate storeys.
b) The permissible displacement as per IS code is (H/500)
i.e, (24800/500) = 49.6 mm
c) The maximum displacement obtained is 25.62mm in X-
direction.
d) The displacement obtained was 49.6 mm without
dampers and with the application of dampers the
displacement has been reduced to 25.62 mm.

e) Application of viscous dampers have reduced the
displacement by 42%
3.1.2 Storey Response Displacement in mm in x-
direction for G+ 12
Storey
Elevation
(m)
Displacement
(mm)
without dampers
Displacement
(mm)
With dampers
X-Dir Y- Dir X-Dir Y- Dir
12 37.2 106.4 94.05 57.45 50.79
11 34.1 100.11 87.52 54.06 47.26
10 31 94.15 78.34 52.72 43.87
9 27.9 92.53 76.45 51.81 42.81
8 24.8 89.51 73.63 50.13 41.23
7 21.7 85.01 69.62 47.61 38.99
6 18.6 78.66 64.23 44.05 35.97
5 15.5 70.76 57.72 39.62 32.32
4 12.4 61.73 50.16 34.57 28.09
3 9.3 51.68 41.72 28.94 23.36
2 6.2 40.3 32.64 22.57 18.28
1 3.1 26.34 21.6 14.57 12.09
0 0 0 0 0 0
Fig -5: Graph of Story Response x direction
Fig -5: Graph of Story Response y direction
a) The graph shows displacement v/s height of the
building for G + 12 building with dampers applied at
alternate storeys.
b) The permissible displacement as per IS code is (H/500)
i.e, (37200/500) = 74.4 mm
c) The maximum displacement obtained is 57.45 mm in X-
direction.
d) The displacement obtained was 106.4 mm without
dampers and with the application of dampers the
displacement has been reduced to 57.45 mm.
e) Application of viscous dampers have reduced the
displacement by 45.15 %
4. CONCLUSION
a) The structure evaluated with theapplicationofdampers
to be efficient and viscous dampers can serve as better
energy dissipating device.
b) It can be conclude that, with the application of viscous
dampers the seismic performance of the structures can
be improved against earthquakes.
c) Non-Linear dynamic analysis shows theactual response
of the structure subjected to earthquakes.
d) In G+8 building with the application of viscous dampers
we can see a reduction of displacement by 42%.
e) In G+10 building with the application of Viscous
dampers we can see a reduction of displacement by
45.15%

f) Application of Viscous dampers significantly increases
the stability and stiffness of the structures.
REFERENCES
[1] Constantinous. M. C., Soong, T. T., and Dargush, G. F.
(1998). “Passive energy dissipation systems for
structural design and retrofit”, Monograph No. 1,
Multidisciplinary Center for Earthquake Engineering
Research, Buffalo, New York.
[2] Chang, K. C., Soong, T. T., Lai, M. L., and Nielsen, E. J.
_1993_. “Development of a design procedure for
structures with added viscoelastic
[3] Trevor e Kelly and t k dutta “optional use of VE dampers
in frames for seismic forece”,ASCE J.Strutural
engineering
[4] T. Soong and G. F, Dargush John Wiley Sons Chichester,
Passive energy dissipation in Structural engineering,
Volume6, Issue 1 June 1999.
[5] Trever. E. Kelly, S.E, “In Structure damping and energy
Dissipation guidelines” Volume 4, July 2001.
[6] Hanson RD, Soong TT,Seismic designwithsupplemental
energy dissipation devices. Monograph No. 8, EERI
Oakland, 2001.
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damping system for seismic energy dissipation,” ISET
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[9] T.T. Soong and B.F. Spencer, “Supplemental energy
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[10] Robert J. MCNAMARA and Douglas P. Taylor, “Fluid
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[11] Lyan-Ywan Lu, “Predictive control of seismic structures
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668,2004
BIOGRAPHIES
First Author: Mr Amit A. Kusanale,
Assistant Professor,
Department of Civil engineering,
P.V.P.I.T, Budhgaon,
Sangali,
Maharastra
Second Author: Mr Keshav R. Manerikar
P.G Student,
Department of Civil engineering,
P.V.P.I.T, Budhgaon,
Sangali,
Maharastra

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