摘要:研究目的:在实际地震中由于水平倾覆力矩和竖向地震作用的影响，基础隔震结构中橡胶支座承受的竖 向压力将会产生较大变化，而橡胶支座竖向压力的变化将会对支座的剪切性能产生一定影响，因而有必要对 支座剪切性能的压力相关性进行研究。本文采用低周反复循环加载试验方法对高阻尼橡胶支座进行压剪试 验，研究压应力和剪应变对支座剪切性能的影响，从而建立高阻尼橡胶支座剪切性能的压力相关性经验公式。研究结论 ：(1)随着压应力和剪应变的增大，支座的滞回曲线越来越饱满，支座的耗能能力增大，并出现 了明显的刚度硬化现象;（2)支座的屈服力和等效阻尼比随着压应力的增大而增大，随着剪应变的增大，压应 力对屈服力的影响逐渐增大，压应力对等效阻尼比的影响有所减小；（3)支座的屈服后刚度随着压应力的增 大而减小，随着剪应变的增大，压应力对屈服后刚度的影响逐渐减小；（4)当剪应变较大时，水平等效刚度随 着压应力的增大而增大;（5)根据试验结果给出了支座剪切性能的压力相关性经验公式，可供高阻尼橡胶支 座基础隔震结构设计人员参考和使用。

Abstract: Research purposes: In the actual earthquake due to the impact of horizontal overturning moment and vertical ground motion，the vertical pressure on the rubber bearing in the base - isolated structure will change greatly，and the shear properties of tlie bearing will change due to the changing of the vrtical pressure of the rubber bearing. So it is necessary to study the pressure dependence about the shear properties of the bearing. In this paper，the cyclic loading method was adopted to study the shear properties of the high damping rubber bearing，the influence of the vertical pressure and shear strain on theshear properties of HDR was studied. So the empmcal formula on the presure dependence of the bearing shear properties will be established. Research conclusions:(1) Witli the increase of compressive stress，the hysteresic loops of HDR become more full，the energy dissipation of HDRincreases，and the stiffness harding phenomenon obviously appears. (2) The yield force and the equivalent damping ratio of HDR increase witli the increase of compressive stress. As the shear strain increasing，the 9fect of compressive stress on the yield force increases, the 9fect of compressive stress on the equivalent damping ratio decreases. (3) The post yield stiffness of HDR decreases with theincrease of compressive stress，the effect of compressive stress on the post yield stiffness decreases with the increase of shear strain. (4) When the shear strain is larger，the horizontal equivalent stiffness of HDR increases with the increase of compressive stress. (5) According to the test results，the empircal formula on the pressure dependency of the bearng shear properties is given， which can be used by deigners of tiie bae - isolation stricture.