基于负刚度碟簧装置的竖向隔震支座力学性能研究

Mechanical Behaviors of Vertical Isolation Bearings Incorporating Disc Spring Negative Stiffness Devices

在竖向隔震中,为同时满足高静态刚度和低动态刚度的需求,提出一种基于预压碟簧的负刚度装置(disc spring negative stiffness device,DSNSD),利用其与已有的预压弹簧装置(prepressed spring device,PSD)集成为拥有高静低动刚度的竖向隔震支座(PSD-DSNSD隔震支座)。首先对DSNSD的构造与工作原理进行详述,建立相应的力学模型,再通过Python进行数值模拟,考察上述碟簧装置的力学性能,最后利用Abaqus建立PSD-DSNSD竖向隔震支座的有限元模型进行模拟。结果表明:加入DSNSD后竖向隔震支座的隔震刚度显著降低,验证了将DSNSD用于竖向隔震增效的可行性。说明DSNSD在启动后可提供负刚度,从而有效减小整体装置的竖向刚度。

Three-dimensional(3D)isolation is one of the current research hotspots for the control of strong seismic be-havior of structures.However,the contradiction between high static stiffness for load carrying and low dynamic stiffness for vertical isolation is a long-term unsolved issue in the development of 3D seismic isolation.Accordingly,a disc spring negative stiffness device(DSNSD)is proposed,which is combined with the previously developed prepressed spring device(PSD)to form a vertical isolation bearing with high-static-low-dynamic stiffness.The configuration and working principle of the DSNSD are described in detail,and the corresponding mechanical model is established.Py-thon-based numerical simulations are conducted to investigate the mechanical properties of the DSNSD.A PSD-DSNSD vertical isolation bearing is modeled using ABAQUS to validate the feasibility of using DSNSD to improve vertical isola-tion effects.The results show that the DSNSD provide the anticipated negative stiffness in vertical isolation after activa-tion,which is used to effectively reduce the vertical stiffness of the entire isolation device.