Summary
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.
The resetting semi-active stiffness damper (RSASD) has proven effective in reducing the seismic response of structures. However, it relies on a multi-component feedback control system that is subject to reliability issues. Recently, research was conducted to replace components of the system with a mechanism that enables a similar control performance. The resulting resetting semi-passive stiffness damper (RSPSD) offers increased reliability without compromising effectiveness. To date, a model of the RSPSD has been developed and simulations have been conducted to evaluate its control performance. It was found that implementing the resetting control law in a numerical environment is complicated by building drift displacements that are characterized by local peaks. The present work details the development of the control logic that is required for simulating resetting of the RSPSD control force. It is demonstrated through numerical simulations of two single-story buildings equipped with the RSPSD and subject to a sinusoidal excitation.
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