CB
DESIGN BASE SHEAR COEFFICIENTS FOR HIGH-RISE REINFORCED
CONCRETE BUILDINGS
Kazushi SHIMAZAKI and Akira WADA
Summary
Seismic loads for high rise buildings are affected by higher modes
even base shear force. This paper investigates the base shear
coefficient for the preliminary earthquake resistant design considering
the second mode contribution using a simple model and the design
earthquake acceleration response spectrum. The required design base
shear strength is established from this spectrum and the design
criterion such as story drift limitation and allowable ductility
factors of structural members. Final suggestion of this paper is
CB=0.24/Ti, here CB is base shear coefficient and Ti is initial
period of a building. The dynamic response analysis for the buildings
having the base shear strength calculated by this equation showed
sufficient earthquake resistant ability.
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