CB
DESIGN SEISMIC COEFFICIENTS FOR HIGH-RISE REINFORCED CONCRETE
BUILDINGS
Kazushi SHIMAZAKI and Akira WADA
Summary
The story shear distribution of a high-rise reinforced concrete
building is investigated for the earthquake resistant design. The
time-invariable oscillatory mode shapes of the building designed with
the appropriate story shear strength distribution are close to the
elastic stiffness mode shapes. This means the seismic coefficient
distribution obtained by the SRSS method using the elastic mode shapes
is reasonable. The seismic coefficient distribution shapes proposed
previously are compared with this distribution shape. The results of
response analyses show if the seismic coefficient distribution with
disregard to higher mode effect is used for design, it leads to the
drift concentration. The story shear strength should be within 1.2
times of the design shear force distribution to avoid the drift
concentration caused by the discontinuous distribution.
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