Abstract
Abstract Columns made of a linear three-element model material and with initial lateral deflections, referred to as ‘imperfections’, are analyzed by the dynamic and static approaches. Both analyses provide approximately the same time-deflection response for the structure. It is shown that imperfections may be regarded as a special class of disturbances which do not affect the value of the viscoelastic critical load. However, the influence of such ‘permanent’ disturbances on the rate of deformation is much more severe than that due to disturbances acting on a perfect column. Consequently, any possible safe operational period, related to the so-called ‘critical time,’ for the imperfect structure is much shorter than a corresponding period obtained from an analysis of the perfect column.
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