SEISMIC STORY DRIFT ESTIMATION

The seismic storey drift estimation procedure in the 1990 edition of t he National Building Code of Canada is evaluated for ductile moment-re sisting frame buildings located in different seismic regions. The eval uation is based on a comparison of the storey drifts estimated from th e code procedure with those obtained from the inelastic dynamic analys is of the buildings. The results indicate that the code procedure unde restimates storey drift for low-rise ductile moment-resisting frame bu ildings. It provides good estimates of storey drift for medium- and hi gh-rise ductile moment-resisting frame buildings. The code estimation tends to become conservative as the number of storeys increases.