Published in Earthquake Spectra, Volume 27, Issue 3, January 1, 2011, pages 939-946.
The definitive version is available at https://doi.org/10.1193/1.3610247.
This paper compares base shears computed from floor accelerations (inertial base shear) and column shears (structural base shear) for two mid-rise, multistory buildings due to a suite of 30 earthquake ground motions. The presented results demonstrate that the inertial base shear exceeds the structural base shear in the median by 10% to 20% and may exceed the structural base shear by as much as 70% for individual ground motions. Therefore, it is concluded that the inertial base shear computed from strong motion records should be used with caution to estimate the structural base shear.
Civil and Environmental Engineering
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