Abstract
A rigid slab supported by two lateral load resisting elements with random yield strength is used to evaluate the sensitivity of structural response to the uncertainty in the restoring force of these elements. The input ground acceleration consists of scaled versions of the strong-motion protion of the 1940 El Centro record. The structure is symmetric in the elastic range and behaves as a single-degree-of-freedom system. However, it can experience translational and torsional vibrations following the first yielding because of the difference between the values of the element yield strengths, caused by uncertainty. The dissipated energy and the maximum displacement, ductility, and rotation are used to quantify the response sensitivity to the uncertainty in the restoring force model. The dissipated energy is the least sensitive response measure. On the other hand, the maximum rotation of the structure can be strongly affected by this uncertainty. Therefore, special design measures are needed to limit the uncertainties in this response measure.
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