Re-shaping hysteretic behaviour using resetable devices to customise structural response and forces (2006)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Civil Engineering.
University of Canterbury. Mechanical Engineering.
AuthorsRodgers, G.W., Mander, J.B., Chase, J.G., Mulligan, K.J., Deam, B.L., Carr, A.J.show all
Semi-active dampers have significant capability to reduce wind and seismic structural response. A novel resetable device with independent valve control laws that enable semi-active re-shaping of the overall structural hysteretic behaviour has been recently developed and validated. Three methods of re-shaping structural hysteretic dynamics are statistically analysed in a performance-based seismic design context. Response reduction factors from the uncontrolled case are obtained across a spectrum of structural natural periods for displacement response, structural force, and total base shear. Overall results indicate that reduction factors are suite (near-field versus far-field) invariant. Resisting all motion and resetting at zero velocity adds damping in all four quadrants and showed 40-60% reductions in the structural force and displacement at the cost of a 20-60% increase in total base-shear. Resisting only motion away from equilibrium adds damping in quadrants I and 3, and gave reductions of 20-40%, with a 20-50% increase in total base-shear. However, only resisting motion towards equilibrium added damping in quadrants 2 and 4 only,, for which the structural responses and total base-shear were reduced 20-40%. The reductions in both response and base-shear indicate the appeal of this unique, semi-active hysteresis sculpting approach for seismic retrofit applications largely due to the reduction of the force and overturning demands on the foundation system
CitationRodgers, G.W., Mander, J.B., Chase, J.G., Mulligan, K.J., Deam, B.L., Carr, A.J. (2006) Re-Shaping hysteretic behaviour using resetable devices to customise structural response and forces. San Francisco, CA, USA: 100th Anniversary Earthquake Conference including the 8th U.S. National Conference on Earthquake Engineering (8NCEE), 18-21 Apr 2006. 10 pp.
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