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Determination of Acceptable Structural Irregularity
Limits for the Use of Simplified Seismic Design
Methods
V.K. Sadashiva, G.A. MacRae, B.L. Deam & R. Fenwick
Department of Civil Engineering, University of Canterbury, New Zealand.
ABSTRACT: Current NZ code regularity limits for structures are based on engineering
judgement rather than on quantitative analysis. This paper describes a quantitative
method to determine limits for structural irregularity for structures designed using
different analysis procedures. In this method, a parameter such as the change in median
response, or the increased probability of greater demand, may be computed and then
limited to an acceptable level. Irregularity limits based on a specified level of confidence
are selected and these are then proposed for use in design. The method is illustrated by an
example considering mass irregularity |
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