(2) Shaking Table Test
The shaking table test is realistic and clear when the response of a structure during an
earthquake is discussed. A specimen is set up on the table which can be driven by actuators as
shown in Fig. 1. Test specimens are usually manufactured for the shaking table test; therefore
a destructive test can be performed. Miniaturized specimens are sometime used because of the
capacity limitation of the table.
BRI has a one-dimensional middle-sized shaking table in the Structural Testing
Laboratory. Recently constructed shaking tables can be driven in two- or three-dimensions.
Consequently, those can reproduce actual earthquake motions more faithfully than
one-dimensional tables.
Periodic waves, such as sine, rectangular and triangular, and random waves, such as
white noise, artificial earthquake motions and observed earthquake motions, can be chosen as
the input motion.
Steady-state shaking using harmonic waves with various frequencies is usually made
to grasp general dynamic properties of the specimen. Amplitudes of the input harmonic waves
are low and response of the specimen remains in the elastic range. Random shaking using
white noise is utilized to check the dynamic properties in the elastic range as well.
Random shaking using observed strong motions can simulate actual situation during
an earthquake. The amplitude of the strong motion record is adjusted according to the seismic
capacity of the specimen and the testing purpose. You can damage and destroy the specimen
by the earthquake motion. Artificial earthquake motions may be used if strong motion records
with desired characteristics cannot be found out.
By the other hand, shaking table test is generally costly to execute. The construction
of shaking table facilities would be a big project. Specimens must be newly built only for
testing. In addition, there are limitations of size and weight due to the shaking table capacity.
It is not easy to reproduce an actual situation.
(2) Shaking Table TestThe shaking table test is realistic and clear when the response of a structure during anearthquake is discussed. A specimen is set up on the table which can be driven by actuators asshown in Fig. 1. Test specimens are usually manufactured for the shaking table test; thereforea destructive test can be performed. Miniaturized specimens are sometime used because of thecapacity limitation of the table.BRI has a one-dimensional middle-sized shaking table in the Structural TestingLaboratory. Recently constructed shaking tables can be driven in two- or three-dimensions.Consequently, those can reproduce actual earthquake motions more faithfully thanone-dimensional tables.Periodic waves, such as sine, rectangular and triangular, and random waves, such aswhite noise, artificial earthquake motions and observed earthquake motions, can be chosen asthe input motion.Steady-state shaking using harmonic waves with various frequencies is usually madeto grasp general dynamic properties of the specimen. Amplitudes of the input harmonic wavesare low and response of the specimen remains in the elastic range. Random shaking usingwhite noise is utilized to check the dynamic properties in the elastic range as well.Random shaking using observed strong motions can simulate actual situation duringan earthquake. The amplitude of the strong motion record is adjusted according to the seismiccapacity of the specimen and the testing purpose. You can damage and destroy the specimenby the earthquake motion. Artificial earthquake motions may be used if strong motion recordswith desired characteristics cannot be found out.By the other hand, shaking table test is generally costly to execute. The constructionof shaking table facilities would be a big project. Specimens must be newly built only fortesting. In addition, there are limitations of size and weight due to the shaking table capacity.It is not easy to reproduce an actual situation.
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