Manuscript Reference: Rakesh K. Goel, Earthquake Spectra, vol. 27, no. 3 (August 2011): 939–946.

This writer would like to congratulate the author for his study on estimation of base shears of buildings, a topic of recognized importance in seismic assessment of buildings, and for recalling the attention of the scientific and engineering community to the pertinent effect that damping forces have on the results of nonlinear structural analysis.

The paper focuses on the comparison between base shears computed from floor accelerations (inertial) and column shears (structural), which have been found in disagreement, according to observations from buildings strongly shaken...

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