Abstract
Predicting the ultimate behavior of elastomeric bearings subjected to combined compression-shear loading is an indispensable part of quantitatively evaluating the performance of seismic isolated structures during earthquakes. In this paper, the initial critical load derived from three different approximations for bending modulus are analyzed and evaluated by existing experimental data. Then, Finite Element (FE) models of bearings are developed and validated by critical load results. Based on that, a parametric FE study is performed to investigate the failure mode of bearings under this combined loading. It is demonstrated that the bending modulus based on the pressure solution and further simplification provides a more reasonable estimate of initial critical load. The predicting capacity of the overlapping area method for the general trend of critical load is improved with the increasing of external diameter. The dividing line between stability limit and shear failure is dominated by the second shape factor. Furthermore, as the first shape factor increases, the ultimate shear deformation corresponding to shear failure slightly increases.
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