Modified adaptive negative stifiness device with variable negative stifiness and geometrically nonlinear damping for seismic protection of structures
- Publisher:
- World Scientific Publishing
- Publication Type:
- Journal Article
- Citation:
- International Journal of Structural Stability and Dynamics, 2021, 21, (8)
- Issue Date:
- 2021-01-01
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19059084_7811654470005671.pdf | Published version | 6.44 MB |
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Adaptive negative sti®ness device is one of the promising seismic protection devices since it can generate seismic isolation e®ect through negative sti®ness when it is mostly needed and achieve similar vibration mitigation as a semi-active control device. However, the adaptive negative sti®ness device generally combined with linear viscous damping underpins the drawback of degrading the vibration isolation e®ect during the high-frequency region. In this paper, a modi¯ed adaptive negative sti®ness device (MANSD) with the ability to provide both lateral negative sti®ness and nonlinear damping by con¯guring linear springs and linear viscous dampers is proposed to address the above issue. The negative sti®ness and nonlinear damping are realised through a linkage mechanism. The fundamentals and dynamic characteristics of a SDOF system with such a device are analyzed and formulated using the Harmonic Balance Method, with a special focus on the amplitude–frequency response and transmissibility of the system. The system with damping nonlinearity as a function of displacement and velocity has been proven to have attractive advantages over linear damping in reducing the transmissibility in the resonance region without increasing that in the high-frequency region. The e®ect of nonlinear damping on suppressing displacement and acceleration responses is numerically veri¯ed under di®erent sinusoidal excitations and earthquakes with di®erent intensities. Compared with linear damping, the MANSD with nonlinear damping could achieve additional reductions on displacement and acceleration under scaled earthquakes, especially intensive earthquakes.
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