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CONCLUSION
In this paper the improvements in earthquake action provision in the China code for seismic design of
buildings GB 50011-2001 are summarized as (1) The long period band of design spectrum has been
extended from 3 second to 6 second, while the low limit of the design spectrum at long period has been
removed, and a slow decline line is adopted instead; (2) Two additional intervals of a ^^ are added ,
one each for Intensity W and VI respectively, and T g9 the characteristic period, is determined based
on both the seismic zoning map and the site condition. Thus, the "far-source" effect does not need to
be taken into account once again.
Three further improvements are also suggested for future consideration for inclusion into the code, as
follows: Q max to be adjusted according to site condition, the long period band of the design spectrum
to be extended to 10 second, and the declining rate of the design spectrum at long period range to be
-1.0, the design spectra ratio of vertical and horizontal components to be taken as a function of period
for soil sites, instead of a constant value of 0.65.
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