A Comparative Study on Seismic Provisions Made in UBC-1997 and Saudi Building Code for RC Buildings
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This paper presents a comparative study of static
analysis procedure for seismic performance based on UBC-1997 and
SBC-301-2007(Saudi Arabia). These building codes define different
ductility classes and corresponding response reduction factors based
on material, configuration and detailing of reinforcements. Codes
differ significantly in specifying the procedures to estimate base
shear, drift and effective stiffness of structural members. One of the
major improvements made in new SBC (based on IBC-2003) is
ground motion parameters used for seismic design. In old SBC
(based on UBC) maps have been based on seismic zones. However
new SBC provide contour maps giving spectral response quantities.
In this approach, a case study of RC frame building located in two
different cities and with different ductility classes has been
performed. Moreover, equivalent static method based on SBC-301
and UBC-1997 is used to explore the variation in results based on
two codes, particularly design base shear, lateral loads and story
drifts.