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Resetting passive stiffness damper with passive negative stiffness device for seismic protection of structures
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.
Resetting passive stiffness damper with passive negative stiffness device for seismic protection of structures
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.
Resetting passive stiffness damper with passive negative stiffness device for seismic protection of structures
Walsh, Kenneth K. (author) / Sallar, Grace (author) / Haftman, John T. (author) / Steinberg, Eric P. (author)
2021-08-01
21 pages
Article (Journal)
Electronic Resource
English
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