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- W1829392453 abstract "This paper presents the results of 56 large-amplitude shake table tests of a 30% scale eight-storey controlled rocking steel frame. No significant damage or residual deformations were observed after any of the tests. The frame had four possible configurations on the basis of combinations of two higher mode mitigation mechanisms. The first mitigation mechanism was formed by allowing the upper section of the frame to rock, so as to better control the mid-height overturning moment. The second mitigation mechanism was formed by replacing the conventional first-storey brace with a self-centering energy dissipative (SCED) brace, so as to better control the base shear. The mechanisms had little effect during records where higher mode effects were not apparent, but they substantially reduced the shear and overturning moment envelopes, as well as the peak floor accelerations, during more demanding records. The reduction in storey shears led to similarly reduced brace force demands. Although the peak force demands in the columns were not reduced by as much as the frame overturning moments, using an upper rocking joint allowed the column demands to be estimated without the need to assume a lateral force distribution. The tests demonstrated that multiple force-limiting mechanisms can be used to provide better control of peak seismic forces without excessive increases in drift demands, thus enabling more reliable capacity design. These results are expected to be widely applicable to structures where the peak seismic forces are significantly influenced by higher mode effects. Copyright © 2012 John Wiley & Sons, Ltd." @default.
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- W1829392453 date "2012-09-18" @default.
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- W1829392453 title "Mechanisms to limit higher mode effects in a controlled rocking steel frame. 2: Large-amplitude shake table testing" @default.
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- W1829392453 doi "https://doi.org/10.1002/eqe.2258" @default.
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