Re-Shaping Hysteresis: Seismic Semi-Active Control Experiments for a 1/5th Scale Structure

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Conference Contributions - Published
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University of Canterbury. Mechanical Engineering.
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Date
2007
Authors
Chase, Geoff
Mulligan, K.J.
Elliott, R.B.
Rodgers, G.W.
Mander, J.B.
Carr, A.J.
Anaya, R.F.
Abstract

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.

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Chase, 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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