FIELD SHAKE TABLE TESTS: AN EFFECTIVE DEMONSTRATIVE TOOL FOR SIESMIC STRENGTHENING BUILDING TECHNOLOGY

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 04 | Apr 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 3846
FIELD SHAKE TABLE TESTS: AN EFFECTIVE DEMONSTRATIVE TOOL
FOR SIESMIC STRENGTHENING BUILDING TECHNOLOGY
Chandrark Bhavsar1, Ms. Megha Bhatt2
1PG Student. M.E.(Civil) Infrastructure Engineering, L.D.R.P. Institute of Technology & Research, Gandhinagar
2Faculty, Dept. of Civil Engineering, L.D.R.P. Institute of Technology & Research, Gandhinagar, Gujarat
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Abstract - It is evident that anywhere in the world, if
earthquake of magnitude higher than 5 or more leave behind
each earthquake, damaged houses and infrastructures and
loss of lives in the affected areas. After each earthquake
engineers and researchers also improvise seismic
strengthening techniques for affected buildings to make it
earthquake safe against future event. Laboratory level
experiments may be useful to derive the new and improved
techniques to be implemented but in practice at ground level
artisans are required to be made not only aware about the
same but also needs to be trained to execute in actual practice
to make building future earth quake safe.
Field shack table test program in the earth quake affected
area can increase awareness amongst the artisans , house
owners and can be used effectively for confidence building in
the improvisation techniques . Various types of scalemodeling
of actual houses built by house owners can be tested
simultaneously on the same table in the same set of
experiment to the level of collapse of non improvised or
tradition house, which provide clear understanding to
artisans ,house ownersand viewer. Information dissemination
of the seismic strengthening techniques can be made wide
spread and quickly among society in general and proactive
measures or policy at government level can be made.
Key Words: Shake Table, Seismic strengthening,
Improvised Houses, Traditional Houses, Information
Dissemination, Proactive Measures.
1.INTRODUCTION
If we consider the reaction of the people after every
earthquake, there would be no difference in terms of
peoples psyche, fear, casual approach related to living
once again in the vulnerable houses, non engineered
approach towards reconstruction of their houses
again but with the use of more expensive materials
and without using improvised building elements that
can safe guard human life loss against future earth
quake. In such circumstances , it is duty of researchers
and engineers to build up once again the confidence in
the society to reconstruct the houses and
infrastructurewiththesamelocallyavailablematerials
, with the help of same artisans which are available
within geographic reach and economically viable way,
but with the use of improvised technology. The
demonstration of techniques which were proved
effective in the laboratory must have visibility and
reach for all and everyone. To serve these purposes "
Field shake Table' are supposed to be the most viable
means of demonstration for all stake holders ranging
from, engineering students, researchers, developersof
housing , house owners and artisans community who
actually execute.
1.1 The Shake Table
• A Simple Movable 6.5m X 3m RC Platform on
Rollers
• Construct one or two Test Models on Platform
• Install acceleration measuring devices
• Apply a series of shocks of increasing intensity
and observe impact
Fig-1: Roller Installation and Roller Bearings
Fig-2: Table Frame Erection

1.2 Impact Mechanism or Shock Devices
( a ) Tractor with Wooden Ram:
It is essential for shake table installed on a roller
bearing with reaction beam at far end that variety of
impact mechanism is to be provided. Usually for field
shake table programme following two types of
mechanism can be installed:
Fig-3: Tractor with wooden ram
when an open field Shake table test program
conducted and specifically in rural area, this is most
viable option adopted to impart impact on shake table.
In the event if the wooden ram get broken into pieces,
same can be easily replaced with any kind of junle
wood log of required size.
(b) Pendulum Device:
Fig-4: Pendulum Mechanism
M.S. frame structure with 1.2 Tons or 1.5 Ton loads, a
pendulum device can be fabricated near impact end of the
R.C.C. shake table. Advantage of the pendulum mechanism is
that ," angle of fall" and there by impact load can be
controlled and can be decided prior to start the series of
tests.
2. The Shake Table testing Program
Series of test program can be designed prior to
construct the scaled model on the shake table.
Normally two models adjoining to each other can be
constructed. Among which one modelwithimprovised
techniques whichistobetestedanddemonstratedisto
be constructed near impact end to receives maximum
impact energy. At far end or near to reaction end
traditional house model is to be constructed so the
viewers can relate to that modelconstructedwiththeir
existing house which is collapsed due to earth quake
forces in their area of event.
One after another shocks either by tractor attached
wooden ram or with thependulummechanismisgiven
to shake table and reaction or absorption of energy
generated due to impact is to be registered. damage
pattern in both the models are to be recorded after
each subsequent shocks.
Whenever any model collapse or damage to the level
when energy transmission recording is not possible,
test must be stopped. The final outcome is recorded
and throughout the tests video recording is to be
carried out for future dates awareness campaign.
Demonstrativedestructionpatternandfinalcollapseof
the tradition house verses stable model or very little
damaged house model against all impact will create
confidence building in the minds of viewers and
engineers for the improvisation techniques
implementation.
Fig-5: Shake Table Test models

Fig-6: Accelerometer for measuring acceleration
Fig-7: Traditional v/s Improved Model on Shake Table
Fig-8: Stable / slightly damaged improvised model v/s
total collapsed Traditional Model
Fig-9: Author is showing the number of shock condition of
two models after impact.
3. CONCLUSIONS
After series of shake Table Program, for variety of
parameters like, different combination of construction
materials like stone, bricks, cement blocks in different
binding mortars like cement sand, lime and even mud , each
one can be tested to enhance understanding of effectiveness
of earthquake resistant features in improvised manner.
A pair of traditional and improvised house model can be
studied for the effect of different parameters on structural
performance of new techniques. Shake table Test have
effective role in building peoples’ confidence in quake
resistant building technologies. The shock Table Test can be
used to Create felt need for long-term safety. While
performing the test in the field in presence of hundreds of
people , it is actually an attempt to understand the impact of
tests on peoples’ psyche and also increase the acceptance
level of improvised techniques. The results derived from
Shake table Test , government agencies can effectively
implement statewide campaign of training , awareness and
demonstration through videos prepared during on going
tests.
It can be concluded that from the field shake table program,
a technology in which confidence can be build and felt need
for the safe and sound house construction technologycanbe
derived, tested right now, rather than wait for next
earthquake.
REFERENCES
[1] Field Shake Table Program for Confidence Building in
Quake resistance Technology, By National Centre for
People's Action in Disaster Preparedness, for UNCRD &
EDM- Kobe, Japan

FIELD SHAKE TABLE TESTS: AN EFFECTIVE DEMONSTRATIVE TOOL FOR SIESMIC STRENGTHENING BUILDING TECHNOLOGY

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