基于老化-海蚀循环的高阻尼橡胶支座剪切性能相关性试验研究

A 150-day aging-marine erosion cycles test was carried out on the high damping rubber bearing (HDR). The shear performances of HDR were regularly tested. Test results were analyzed and the influences trend of aging-marine erosion cycle time and shear strain on shear performance of HDR were summarized. The test results show that, when the aging-marine erosion cycle time is the same, the ratio of horizontal equivalent stiffness, ratio of equivalent damping ratio and the ratio of post-yield stiffness decrease with the increase of shear strain, while the ratio of yield force increases with the increase of shear strain. Under the same shear strain, the ratio of horizontal equivalent stiffness and the ratio of post-yield stiffness generally increase with the increase of aging-marine erosion cycle time, and the larger the shear strain, the greater the growth rate of the ratio of horizontal equivalent stiffness. The ratio of equivalent damping ratio shows a decreasing trend with the increase of aging-marine erosion cycle time, while the ratio of yield strength increases first and then decreases. Finally, the variation formulas of the ratio of horizontal equivalent stiffness, ratio of equivalent damping ratio, ratio of post-yield stiffness and ratio of yield force with aging-marine erosion cycle time and shear strain were obtained, which can provide a theoretical basis for seismic isolation designers and further study on the changing trend of HDR properties in the marine environment.