A new type of negative stiffness friction damping device (NSFDD) was developed in this study, which can solve the problem of poor energy dissipation of the existing passive negative stiffness damping device. The friction force is generated by squeezing the friction plate with the preloaded nitrogen spring vertically. When the NSFDD is working, the friction plate causes the nitrogen spring to rotate and negative stiffness force and friction force are generated. The results of the performance test show that the NSFDD can achieve negative stiffness in the hysteretic model. Comparing with the existing negative stiffness device, the NSFDD has larger stroke, more stable negative stiffness and better energy dissipation capacity. The finite element software has been used to simulate the low cycle reciprocation of a structure, and the results show that the NSFDD reduces the stiffness of the structure while increasing the damping of the structure. The results of the simulation and analysis of the shock absorption plan of the NSFDD show that the NSFDD reduces the stiffness of the floor, thereby effectively control on the shear force, displacement and acceleration response of the structure.

本研究开发了一种新型负刚度摩擦阻尼装置（NSFDD），可以解决现有被动负刚度阻尼装置耗能差的问题。摩擦力是通过垂直挤压预紧氮气弹簧的摩擦片产生的。NSFDD工作时，摩擦片使氮气弹簧转动，产生负刚度力和摩擦力。性能测试结果表明，NSFDD 可以在滞后模型中实现负刚度。与现有的负刚度装置相比，NSFDD具有更大的行程，更稳定的负刚度和更好的能量耗散能力。有限元软件已被用于模拟结构的低周往复运动，结果表明，NSFDD降低了结构的刚度，同时增加了结构的阻尼。NSFDD减震方案的仿真分析结果表明，NSFDD降低了楼板的刚度，从而有效地控制了结构的剪力、位移和加速度响应。