基础隔震因其优良的隔震性能已成为一种抗震的新对策 ,为避开强震时地面运动的主要周期 ,原则上讲隔震建筑的周期愈长愈好。这就要求隔震层的水平刚度应很小。但是随着隔震层水平刚度的减小 ,罕遇地震作用下的水平侧移将增加 ,有可能导致橡胶隔震垫因水平位移过大而失稳破坏。 Base isolation has become a new earthquake-resistant measure because of its excellent isolation performance. In order to avoid the main period of ground motion during strong earthquakes, the longer the period of isolated buildings, the better. This requires that the horizontal stiffness of the isolation layer should be small. However, with the decrease of the horizontal stiffness of the isolation layer, the lateral displacement under rare earthquakes will increase, which may lead to the failure of the rubber isolation pad due to excessive horizontal displacement.