Usability of Pushover Analysis for Asymmetric Base-Isolated Buildings

Abstract eng:
The paper deals with the applicability of a simplified nonlinear method (N2 method) to base-isolated plan-asymmetric building structures. In the first part of the paper the modifications that have been implemented into the originally proposed N2 method – such as the new three-linear idealization and inclusion of isolator damping by reduction factor R – are shortly described. In the paper the proposed procedure is used for the seismic analysis of a base-isolated 4-storey RC asymmetric building isolated with lead rubber bearings (LRBs). For the base isolation system we have considered three different types of isolators with different stiffness. The results of nonlinear dynamic time-history analyses are compared with the results of the N2 method in terms of obtained top, base and relative displacements. Comparisons of the results of the simplified method with the ‘exact’ results of the nonlinear dynamic analyses have shown a very good agreement. It has been shown that the presented simplified approach might be a valuable tool for design, analysis and verification of the behavior of symmetric as well as moderately asymmetric base-isolated structures.

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