A comparison of IBC with 1997 UBC for modal response spectrum analysis in standard-occupancy buildings |
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| Authors: | Tariq M Nahhas |
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| Institution: | (1) Department of Civil Engineering, University of Patras, P.O. Box 1424, 26504 Patras, Greece; |
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| Abstract: | This paper presents a comparison of the seismic forces generated from a Modal Response Spectrum Analysis (MRSA) by applying
the provisions of two building codes, the 1997 Uniform Building Code (UBC) and the 2000–2009 International Building Code (IBC),
to the most common ordinary residential buildings of standard occupancy. Considering IBC as the state of the art benchmark
code, the primary concern is the safety of buildings designed using the UBC as compared to those designed using the IBC. A
sample of four buildings with different layouts and heights was used for this comparison. Each of these buildings was assumed
to be located at four different geographical sample locations arbitrarily selected to represent various earthquake zones on
a seismic map of the USA, and was subjected to code-compliant response spectrum analyses for all sample locations and for
five different soil types at each location. Response spectrum analysis was performed using the ETABS software package. For
all the cases investigated, the UBC was found to be significantly more conservative than the IBC. The UBC design response
spectra have higher spectral accelerations, and as a result, the response spectrum analysis provided a much higher base shear
and moment in the structural members as compared to the IBC. The conclusion is that ordinary office and residential buildings
designed using UBC 1997 are considered to be overdesigned, and therefore they are quite safe even according to the IBC provisions. |
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| Keywords: | response spectrum analysis seismic forces multi-story buildings seismic design building codes IBC UBC |
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