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In order to achieve economical earthquake resistant constructi-
on,a building must be able to absorb and dissipate large
amounts of seismic energy.In resent year,experimental results
obtained in National Taiwan University have indicated that
properly welded steel triangular plate energy absorbing devices
can sustain an extremely larg number of yielding reversals.
Pseudodynamic tests of a full-scale two-story steel frame have
further confirmed that the steel plate devices,increasing the
hysteretic damping and stiffness, can effectively reduce the
responses of the structure under severe seismic excitations. A
design methodology based on the optimal stiffness and strength
ratios between the damper and the frame have also been
developed for the application of the triangular-plate added
damping and stiffness (TADAS) devices in building structures.
This paper focuses on an energy-base approach for the design of
TADAS device for seismic-resistant structures. It is
illustrated that the force deformation relationships of a steel
frame const- ucted with the TADAS device can be adequately
characterized by a trilinear model with the distinguished yield
displacements of the TADAS device and the frame. Under several
ground accelerations of various intensities, acceleration,
deformation, energy dissipat- ion and the TADAS ductility
response spectrum of SDOF systems are constructed. From these
studies,it is illustrated that the proposed device is a
promising alternative for buildings intended for extremely
sever seismic service.this paper concludes with the
recommendati- ons for the seismic design and construction of
building structu- res using the proposed TADAS element as
energy absorbing device.
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