Three-Dimensional Analysis of Base-Isolated Structures

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Three-Dimensional Analysis of Base-Isolated Structures

Author: David Alan Roke | Size: 607 KB | Format: PDF | Quality: Unspecified | Publisher: University of Pittsburgh | Year: 2005 | pages: 117

Base isolation has become a widely accepted method for earthquake resistant design of structures. However, the research in the field has been generally restricted to one-dimensional motion. Structural response is not limited to this one-dimensional motion, and the torsional effect of multidimensional motion contributes to the horizontal displacements. A threedimensional structure can not be modeled with multiple one-dimensional analyses; rather, a complete three-dimensional analysis must be undertaken, as shown in this study. Four separate analyses for the calculation of the dynamic response of a base-isolated structure will be presented in this study. The first two analysis procedures are for a single-story base-isolated structure. The last two procedures are for a multi-story base-isolated structure. The first procedure for each structure assumes a fully linear response, in which the bearings and the superstructure remain in the linear elastic range of response. The second procedure allows for a non-linear response from the bearings, in which each individual bearing may yield, changing the effective stiffness value. To expand upon the four analysis procedures, additional considerations presented in this paper include an appendix on the effect of bearing friction and an appendix on plasticity. These two concepts further enhance the applicability of the solution procedures.

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