串联基础隔震结构的隔震特性

由橡胶隔震支座与摩擦滑移隔震支座串联成组合支座,再与橡胶隔震支座并联形成的串联基础隔震结构,在地震时可以取得较好的隔震效果.根据串联基础隔震结构的特点,给出了该种隔震体系的等效阻尼、等效刚度的计算公式;将串联隔震支座设定为多个屈服剪力水平,得到了较好的等效阻尼.实例计算表明,选择合适的摩擦系数和2种支座的刚度比,可以得到性能较好的隔震结构.

Characteristics of series-base-isolation structures

The series-base-isolation structure,with a composite bearing formed by serial connection of the rubber isolation bearing with friction-sliding isolation bearing and connected with the rubber isolation bearing in parallel form,obtains good effect of vibration isolation under earthquakes.According to the characteristics of the series-base-isolation structure,the calculation formulas for the equivalent damp and equivalent stiffness of the structure were given,and the desirable equivalent damp could be obtained by rational design of multi-level yield shear stress of composite bearings.Case study shows that rational determination of the friction coefficient and the stiffness ratio of these two kinds of bearings is helpful to obtain good effect of vibration isolation.