Past research has shown that negative stiffness may be used to good effect in mitigating the response of seismically excited structures. This has led to the emergence of several new negative stiffness devices of varying sizes, complexity, effectiveness, and practicality. In this study, a passive negative stiffness device composed of curved leaf springs using geometric nonlinearity is presented. The proposed device is designed to be simple and compact so as to be easily installed and exhibits approximately constant negative stiffness over a large range of displacements. Beyond these displacements, the negative stiffness produced by the device increases, which can help to limit the transmission of large damper forces at peak structure displacements. At displacements approaching the deformation limit of the device, the device produces positive stiffness so that stability of the structure is ensured. The objective of the research presented herein is to investigate the basic behavior of the device. Shaking table tests on specimens consisting of a vibrating part and the prototype passive negative stiffness device subjected to sinusoidal and simulated earthquake waves were conducted. The results revealed that the specimens exhibited negative restoring force characteristics, and due to the effect of the negative stiffness, an increase in the apparent period was demonstrated. Moreover, reduction of the response acceleration was shown without remarkable increase of the response displacement under the simulated earthquake inputs. Also, a numerical analysis to simulate the shake table testing and evaluate the control effect for a full-scale building model was carried out.

中文翻译：

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具有弯曲板簧的被动负刚度装置的振动台试验，用于减轻结构的地震响应

过去的研究表明，负刚度可以很好地减轻地震激发结构的响应。这导致出现了几种不同尺寸、复杂性、有效性和实用性的新型负刚度装置。在这项研究中，提出了一种由使用几何非线性的弯曲板簧组成的被动负刚度装置。所提出的装置被设计成简单和紧凑以便易于安装并且在大的位移范围内表现出近似恒定的负刚度。除了这些位移之外，设备产生的负刚度会增加，这有助于限制在峰值结构位移时大阻尼力的传递。当位移接近装置的变形极限时，该装置产生正刚度，从而确保结构的稳定性。此处介绍的研究的目的是调查设备的基本行为。对由振动部件和原型被动负刚度装置组成的试样进行了振动台试验，这些试样承受正弦波和模拟地震波。结果表明，试样表现出负恢复力特性，并且由于负刚度的影响，表观周期增加。此外，在模拟地震输入下，响应加速度的降低没有显着增加响应位移。还，