DESIGN SEISMIC COEFFICIENTS FOR HIGH-RISE REINFORCED CONCRETE BUILDINGS

Abstract

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.