The Δ E j -a j curve has a Z-shape, with a monotonically decreasing Δ E j -a j curve before the EPB point and a monotonically increasing Δ E j -a j curve after the EPB point until the FS point when it starts to show a decreasing trend.
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The Stressing State Features of a Bottom Frame Structure Revealed from the Shaking Table Strain Data.
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