Re-Shaping Hysteresis: Seismic Semi-Active Control Experiments for a 1/5th Scale Structure (2007)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Mechanical Engineering.
AuthorsChase, J.G., Mulligan, K.J., Elliott, R.B., Rodgers, G.W., Mander, J.B., Carr, A.J., Anaya, R.F.show all
Semi-active resetable devices can improve seismic response. Novel 2-4 devices independently control each device chamber to customise structural hysteresis loops to reduce both displacement and base shear demands. Here, 2-4 devices are experimentally validated on a one-fifth scale test structure weighing 35kN with a natural period of 0.6 seconds. Four seismic inputs over a wide range of intensity levels are use in 27 tests. Results for resetable semi-active devices that modify hysteretic behaviour using different control laws are compared to spectral response analyses that predict ~30-50% peak displacement reductions. Fully uncontrolled tests were also done for lower intensity ground motions, along with fail-safe valves-open tests. Results show 25-50% peak displacement reductions compared to the valves open case, depending on the semi-active control law used and matching spectral analysis results. Additionally, a semi-active control law designed to simultaneously reduce base shear reduces it 10-20%. In contrast, 10-20% increases are seen for other approaches, as predicted. Overall, these are the first large-scale tests of this type of novel resetable devices. The results validate prior simulation and spectral analyses, and clearly show the potential. Finally, semi-active methods that re-shape hysteresis to control response and simultaneously limit base shear demand, are experimentally demonstrated for the first time.
CitationChase, J.G., Mulligan, K.J., Elliott, R.B., Rodgers, G.W., Mander, J.B., Carr, A.J., Anaya, R.F. (2007) Re-Shaping Hysteresis: Seismic Semi-Active Control Experiments for a 1/5th Scale Structure. Singapore: 8th Pacific Conference On Earthquake Engineering (8PCEE), 5-7 Dec 2007. Proceedings of 8th Pacific Conference On Earthquake Engineering (8PCEE), Paper 71.
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