Shaker table tests In the laboratory have demonstrated the feasibility of base Isolation. This fact alone, however, may not encompass the myriad of parameters that could vary In the prototype to firstly, garner the ramifications of the potential variation of these parameters and secondly, to assign, with a degree of confidence demanded of the engineer, reasonable factors of safety that should be incorporated In such designs. Even more than conventional structures, therefore, sensitivity and probabilistic studies of seismic response of base-isolated structures need to be performed to augment the relatively insignificant data base, In this regard. The study reported here contributes to the data base. Using relatively simple analytical models, which Include material non-linearities, probabilistic analysis of a few base-isolated structures is performed. Distributions of probabilities of exceedance of pertinent design quantities is established. Physical parameters, which are dominant in affecting seismic response, are identified. Important design considerations are discussed and, from this point of view, the role of base Isolation In the aselsmic design is examined.
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