弹塑性缓冲限位与滞变-摩擦并联隔震体系参数分析

针对弹塑性缓冲限位与滞变-摩擦并联隔震体系，建立了隔震系统的恢复力模型和隔震体系的运动方程；根据缓冲限位装置的作用机理，定义了隔震层与缓冲限位装置软碰撞和脱离接触过程中的软碰撞拐点和恢复力拐点，给出了拐点时刻的缓冲限位装置位移和恢复力的计算公式，编制了相应隔震体系的非线性分析程序，分析了缓冲限位装置的缓冲限位距离、弹性刚度、屈服位移等关键参数对隔震体系的影响。研究表明：弹塑性缓冲限位距离的合理取值范围为60～100 mm；缓冲限位装置与滞变 摩擦隔震装置的设计参数完全相同，但缓冲限位装置的设置数量为滞变 摩擦隔震装置数量的一半；与仅滞变 摩擦隔震情况相比，并联隔震体系隔震层位移控制效果在30%以上；与无控情况相比，并联隔震体系的上部结构层间位移控制效果在40%以上。

Analysis on parameters of hysteretic-friction isolated system with elastic-plastic displacement-constraint device

In this research, for the hysteretic-friction system with elastic-plastic displacement-constraint device, the total restoring force model was developed. The motion equation of the isolated system was established. According to the action mechanism of elastic-plastic displacement-constraint device, soft-collision inflection point and restored-force inflection point during the course of colliding and disconnecting between the isolation layer and the displacement-constraint device, were defined. The computational formula of inflection time was given. And the nonlinear analysis program of the corresponding isolated system was worked out. Then, the influence factors such as displacement-constraint distance, elastic stiffness and yield displacement of the displacement-constraint device on the base isolation system were analyzed in detail. The results show that rational distance of the displacement-constraint device is 60-100 mm. The design parameter of the displacement-constraint device is the same as the hysteretic-friction isolation device, but the number is half. Compared with the pure hysteretic-friction isolated system, the isolation effect for the displacement of isolated layer basically is greater than 30%. At the same time, compared with the non-isolated building, the isolation effect of storey-displacement for upper structure is greater than 40%.