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by C. Uang and A. Maarouf
Uang, C., and A. Maarouf (1991). An Investigation of Serviceability Requirements of the 1988 UBC Seismic Provisions. SMIP91
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 15-1 - 15-9.
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Abstract
The Uniform Building Code (UBC) serviceability requirements to control story drift and member
forces for the "moderate" design earthquake are examined. It is shown from the UBC drift limits
that the intensity of the UBC-implied moderate design earthquake for buildings taller than 65
ft. is only one-sixth that of the severe design earthquake. Recorded responses of one steel and
one reinforced concrete building frames which were subjected to ground excitations with an
intensity similar to the UBC moderate design earthquakes are studied. The results show that,
for certain ductile building systems, the UBC one-phase design procedure cannot avoid excessive
story drifts and structural yielding.
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