The objective of the present study is to investigate a new energy dissipation system that combines the positive stiffness of the resetting passive stiffness damper (RPSD) with the negative stiffness of a passive negative stiffness device (PNSD). The displacement-based adjustable stiffness and energy dissipation (D-BASED) system can be designed to have independent damper stiffness and energy dissipation. Equations for modeling the RPSD and PNSD components of the D-BASED system are presented, along with an approach for designing the PNSD component. The results of laboratory experiments on a small-scale prototype D-BASED system are provided for validation of the concept. Numerical simulations are performed for the D-BASED system installed in the isolation layer of a five-story base-isolated building subject to a suite of near-field earthquake ground motions. The performance of the D-BASED system with the same net stiffness, but different levels of energy dissipation, is compared with that of the RPSD alone. It is shown that increasing the RPSD- and PNSD-component stiffness in the D-BASED system results in a reduction in the peak base drift compared to the RPSD, while limiting the building story drifts. Furthermore, it is shown that increasing the RPSD- and PNSD-component stiffness generally does not lead to an increase in the peak total force transmitted to the foundation. The D-BASED system is also found to yield smaller peak story drifts and foundation forces compared to a passive linear fluid viscous damper for a long-period base-isolated building.

中文翻译：

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用被动负刚度装置重置被动刚度阻尼器用于结构抗震

本研究的目的是研究一种新的能量耗散系统，该系统将重置被动刚度阻尼器 (RPSD) 的正刚度与被动负刚度装置 (PNSD) 的负刚度相结合。基于位移的可调刚度和耗能（D-BASED）系统可以设计为具有独立的阻尼器刚度和耗能。介绍了用于对 D-BASED 系统的 RPSD 和 PNSD 组件进行建模的方程，以及设计 PNSD 组件的方法。提供了在小型原型 D-BASED 系统上的实验室实验结果，用于验证该概念。对安装在五层基础隔震建筑物隔震层中的 D-BASED 系统进行了数值模拟，该系统受到一组近场地震地面运动的影响。将具有相同净刚度但能量耗散水平不同的 D-BASED 系统的性能与单独的 RPSD 进行比较。结果表明，与 RPSD 相比，增加 D-BASED 系统中的 RPSD 和 PNSD 组件刚度会导致峰值基础漂移减少，同时限制建筑楼层漂移。此外，结果表明，增加 RPSD 和 PNSD 组件刚度通常不会导致传输到基础的峰值总力增加。