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This figure shows the normal, daily motion Sunshine Skyway Bridge south tower.
The bridge towers bend away from the Sun, towards the west, as sunshine heats
east side in the morning. The towers move in harmony with the Sun as it
crosses the sky until they are bending to east at sunset.
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This figure shows the normal motion of the Mackinac Bridge during a
loading event.
The top panel is the motion of the south tower, the middle panel is
the mid-span, and the bottom panel is the north tower.
The north component of displacement is shown for the two tower stations,
and the up component of displacement is shown for the midspan station.
This figure reveals the bridge's response to the passage of a single
heavy vehicle crossing south to north.
Note the symmetry of the midspan's vertical motion and how the
north and south towers "mirror" each other.
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