Timber arch bridge in Bellevue, Washington State, US

 

The bridge illustrated here is unusual in that it consists of three laminated timber double arches supporting a pedestrian deck over a highway in Bellevue, Wa.. The larger arches support the main span over the carriageway and four similar but smaller arches support the ramps.

You might also wish to view truss bridges in Seattle, a trestle bridge in Bellevue, a bascule bridge in Seattle, bridges in Brisbane & Newcastle, a truss bridge in Ghana and the Volta Bridge in Ghana.

 

The smaller arches which support the ramps run parallel with the road and support the deck on two short timber cross beams.

The deck runs between the arches. The handrail spoils the otherwise elegant effect.

The arches are three pinned which means they are statically determinate and are not stressed by timber shrinkage/swelling or by temperature effects. A series of special fabrications ensure that the pins can rotate. The one below connects the foot of the arch to its concrete foundation

 

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