Structural Engineering and Mechanics

  • 제24권3호
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  • Pages.375-393
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  • 2006
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Nonlinear, seismic response spectra of smart sliding isolated structures with independently variable MR dampers and variable stiffness SAIVS system

  • 투고 : 2005.08.30
  • 심사 : 2006.03.30
  • 발행 : 2006.10.20
⟨ 이전 논문 다음 논문 ⟩

초록

Under high velocity, pulse type near source earthquakes semi-active control systems are very effective in reducing seismic response base isolated structures. Semi-active control systems can be classified as: 1) independently variable stiffness, 2) independently variable damping, and 3) combined variable stiffness and damping systems. Several researchers have studied the effectiveness of independently varying damping systems for seismic response reduction of base isolated structures. In this study effectiveness of a combined system consisting of a semi-active independently variable stiffness (SAIVS) device and a magnetorheological (MR) damper in reducing seismic response of base isolated structures is analytically investigated. The SAIVS device can vary the stiffness, and hence the period, of the isolation system; whereas, the MR damper enhances the energy dissipation characteristics of the isolation system. Two separate control algorithms, i.e., a nonlinear tangential stiffness moving average control algorithm for smooth switching of the SAIVS device and a Lyapunov based control algorithm for damping variation of MR damper, are developed. Single and multi degree of freedom systems consisting of sliding base isolation system and both the SAIVS device and MR damper are considered. Results are presented in the form of nonlinear response spectra, and effectiveness of combined variable stiffness and variable damping system in reducing seismic response of sliding base isolated structures is evaluated. It is shown that the combined variable stiffness and variable damping system leads to significant response reduction over cases with variable stiffness or variable damping systems acting independently, over a broad period range.

키워드

과제정보

연구 과제 주관 기관 : National Science Foundation

참고문헌

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  2. Active and Semi-active Adaptive Control for Undamaged and Damaged Building Structures Under Seismic Load vol.27, pp.1, 2012, https://doi.org/10.1111/j.1467-8667.2011.00719.x
  3. Smart base-isolated benchmark building part IV: Phase II sample controllers for nonlinear isolation systems vol.15, pp.5, 2008, https://doi.org/10.1002/stc.267
  4. Benchmark structural control problem for a seismically excited highway bridge-Part III: Phase II Sample controller for the fully base-isolated case vol.16, pp.5, 2009, https://doi.org/10.1002/stc.293