Stability is one of the most important parameters to evaluate seismic base isolators. Previous research has illustrated the power of base isolators with single and multiple rubber cores. While that work provided a critical introduction to this innovative idea, the lateral stability of seismic steel-rubber base isolators with single and multiple rubber cores was not evaluated; thus it is the topic of the current work. The finite element method is used for modeling of the elastomeric bearing. Three methods, including reduced area formula, quasi-static, and dynamic analysis, were used. The Ogden method is used for modeling rubber material properties. The effect of the size and number of rubber cores on the stability of elastomeric bearing is also investigated. The obtained results show that the use of single and multiple rubber cores increases isolator stability due to the large critical vertical loads. Also, the results of quasi-static methods and dynamic analysis for single rubber core isolators showed that increasing the core diameter has a slight effect on stability. A comparison of the results from the quasi-static and dynamic analysis shows a good agreement, confirming that the simpler quasi-static method is effective to numerically measure the stability limit of steel-rubber base isolators.

稳定性是评估地震隔离器的最重要参数之一。先前的研究已经说明了具有单个和多个橡胶芯的基础隔离器的功能。虽然这项工作为这一创新思想提供了重要的介绍，但未评估带有单橡胶芯和多个橡胶芯的抗震钢-橡胶基础隔离器的侧向稳定性。因此，这是当前工作的主题。有限元方法用于弹性轴承的建模。使用了三种方法，包括面积减小公式，准静态和动态分析。Ogden方法用于对橡胶材料特性进行建模。还研究了橡胶芯的尺寸和数量对弹性轴承稳定性的影响。所得结果表明，由于较大的临界垂直载荷，使用单个和多个橡胶芯可以提高隔离器的稳定性。同样，对单个橡胶芯隔离器的准静态方法和动力学分析的结果表明，增大芯直径对稳定性影响不大。准静态和动态分析结果的比较显示出良好的一致性，这证实了较简单的准静态方法可有效地数值测量钢-橡胶基隔离器的稳定性极限。