碟簧-单摩擦摆三维隔震(振)装置力学性能及隔震(振)效果研究

碟簧-单摩擦摆三维隔震(振)装置(3DFPS)由碟簧竖向隔振单元和单摩擦摆水平隔震单元组成，可以实现环境激励工况下建筑结构的竖向隔振与地震工况下的水平隔震。为了研究3DFPS的力学性能及隔震(振)效果，制作了足尺的3DFPS试件，并对其进行压剪试验。结果表明：3DFPS的竖向性能与水平向性能相互独立，竖向隔振单元与水平隔震单元可独立设计；通过在叠合碟簧间加入0.03mm聚四氟乙烯(PTFE)薄膜可以减小碟簧间摩擦，使小位移下的循环加载刚度更接近大位移下的单调加载刚度。对采用3DFPS和固接到地面的平面框架结构进行有限元弹性时程分析，研究此装置在水平地震与竖向地铁振动激励下的隔震(振)效果。结果表明：三维隔震(振)装置可使水平地震下结构响应减少80%以上，使地铁振动激励下楼面竖向加速度响应减小61%；碟簧竖向压缩变形对结构在水平地震下的响应没有明显的影响。

Mechanical properties and isolation effect of disc spring-single friction pendulum 3D vibration isolation device

The disc spring-single friction pendulum 3D vibration isolation device (3DFPS) is composed of the disc spring vertical vibration isolation component and the single friction pendulum horizontal isolation component, which can realize the vertical vibration isolation of the building structure under the environmental excitation and the horizontal vibration isolation under the earthquake excitation. To investigate the mechanical properties and isolation effect of 3DFPS, a full scale 3DFPS specimen was fabricated and tested under compression-shear loadings. The test results suggest that the vertical and horizontal performances of the 3DFPS are decoupled, and thus the disc spring component and the friction pendulum component can be designed independently. The friction between disc springs can be reduced by adding a 0.03mm PTFE film between overlapped disc springs, and the stiffness of cyclic loading under small displacement is closer to that of monotonic loading under large displacement. The elastic finite element models of a plane frame structure equipped with/without the 3DFPS were simulated to investigate the isolation performance of the 3DFPS under horizontal earthquake ground motion and vertical metro induced ground excitation, respectively. The simulation results show that the 3DFPS can effectively reduce the structural response by more than 80% for earthquake ground motions, and reduce the vertical floor vibration by 61% for subway-induced excitations. The vertical compression deformation of the disc springs has no obvious effect on the response of the structure under horizontal ground motions.