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文中提出了一种由承载橡胶支座和一端具有摩擦滑动面的后备支座组成的并联隔震体系，用以防止承载橡胶支座发生大变形失稳破坏，充分发挥其剪切变形能力，从而达到既经济又安全的抗震设计。体系中的后备支座可以在上部结构施工完毕以后再进行安装，并应保证其在正常使用状态下基本不受竖向荷载。当发生强烈地震时，随着承载支座发生较大的水平向变形并出现下沉的倾向，轴压力逐渐从承载支座转移到后备支座上，后备支座的摩擦面出现滑动，由于滑动面上的力是随轴压力增大而增大的，因此后备支座实际上是一个具有变摩擦滑动特性的软着陆机构，它不仅保护了承载支座免遭大变形失稳破坏，同时还能提供摩擦阻尼，在限制隔震层的位移方面发挥良好的作用。文中对这种并联隔震体系的力学特性和分析计算方法进行了详细的讨论，并用实例展示了在发生水平向大变形条件下，轴压力从承载支座向后备支座上转移的情况。
In this paper, a parallel seismic isolation system consisting of a bearing bearing rubber bearing and a backup bearing with frictional sliding surface at one end is proposed to prevent large deformation and instability of bearing bearing rubber bearing and to fully exert its shear deformation ability To achieve both economical and safe seismic design. The backup support in the system can be installed after the construction of the superstructure is completed, and should be generally not subject to vertical load under normal use. When a strong earthquake occurs, as the bearing seat undergoes a large horizontal deformation and tends to sink, the axial pressure is gradually transferred from the bearing seat to the backup bearing, and the friction surface of the backup bearing slides. Due to the sliding The force on the face is increased as the shaft pressure increases, so the backup bearing is actually a soft landing with variable frictional sliding characteristics that not only protects the bearing seat from large deformation and instability, It provides frictional damping and plays a good role in limiting the displacement of the isolation layer. In this paper, the mechanics characteristics and analysis and calculation methods of the parallel isolation system are discussed in detail, and the case where the axial pressure is transferred from the bearing support to the backup bearing under the condition of horizontal to large deformation is shown by an example.