| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 84 === Although the revision of seismic design code ensures
that the structure designed accordingly can sustain
the future earthquake, most of the existing structures are built
using the previous versions of design code. Thus, an important
issue facing the society is how to strengthen such
structures to sustain the future attack of earthquakes, which
stimulates many researchers'' research interest in recent years.
As a result, many procedures and devices have
been proposed to strengthen the buildings. In this study
the Added Damping and Stiffness device made of triangular plates
(TADAS) is adopted to strengthen the school RC
building and the design procedures are proposed. In the
proposed design procedures, the central part is the
determination of yielding displacement and
the dimension of the TADAS device, and both are obtained using
the code-specified distribution of story shear
and the elastic interstory displacement of the
original building subjected to code-specified lateral load.
Finally the design is checked using the PCANSR 3-D
nonlinear dynamic analysis program.
From the analyses, it can be seen that the overall performance
of the building is improved significantly. In
addition. the following conclusions can also be drawn. (1)
The appropriate percentage of story shear to be resisted by the
TADAS device is 50%, (2) The story displacement
and the rotational ductility of beam and column are all
reduced after the strengthening. The magnitude of PGA can be
increased three times for the strengthened
building, as compared with the original building, to reach the
target failure mechanism. (3) For the structures where
short column effect is significant, it is recommended
that the slit between wall and column be provided in conduction
with the use of TADAS device to obtain the best
result.
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