Saturday, May 14, 2011

Expansion Joint


This is an expansion joint on the western highrise of the Evergreen Point Floating Bridge. Joints like this are needed on large structures to allow controlled movement between otherwise rigid sections, without causing stress or damage.

Expansion joints are especially necessary on floating bridge decks, which rise and fall with the level of the water. Lake Washington isn't tidal, but its water level isn't perfectly constant.

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