基于欧盟标准的铅芯橡胶支座水平性能研究

Research on Horizontal Performance of Lead Rubber Bearing Based on EU Standard

基于欧盟标准,对铅芯橡胶支座进行了水平相关性试验,研究了支座水平等效刚度和等效阻尼比与水平相关性的变化规律。结果表明,水平剪应变、温度、地震频率以及反复加载等因素对支座水平力学性能均存在一定的影响,其中等效刚度随着剪应变的增大而减小,等效阻尼比先增大后减小;支座等效刚度随着频率的增大而增大,等效阻尼比先增大再减小;随着温度的升高,支座的水平等效刚度和等效阻尼比均随着温度的升高而减小。在反复加载过程中,水平力学性能前期的变化幅度明显大于后期,且随着循环次数的增加慢慢趋于平稳。

Based on the European Union standard, the horizontal correlation test of lead rubber bearing was carried out, and the variation rule of the horizontal equivalent stiffness and equivalent damping ratio of the bearing with the horizontal correlation was studied. The results showed that the horizontal mechanical properties of the bearing were affected by shear strain, temperature, seismic frequency and repeated loading. The equivalent stiffness decreased with the increase of shear strain, and the equivalent damping ratio increased first and then decreased. The equivalent stiffness of the bearing increased with the increase of frequency, and the equivalent damping ratio increased first and then decreased. With the increase of temperature, the horizontal equivalent stiffness and equivalent damping ratio of the bearing decreased. In the process of repeated loading, the variation range of horizontal mechanical properties in the early stage was obviously larger than that in the late stage, and then gradually became stable with the increase of the number of cycles.