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The design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid. Even though the kingpost truss alone is capable of bearing a load, this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts. [5]
At the time of its demolition, the bridge was the oldest cantilever bridge in the United States still in use as well as the oldest Scherzer Rolling Lift under the supervision of the Massachusetts Department of Public Works. Streetcar tracks originally ran across the bridge. [1] This bridge closed for several months for repairs on 15 December 2008.
The rolling lift trunnion (sometimes a "Scherzer" rolling lift), raises the span by rolling on a track resembling a rocking-chair base. The "Scherzer" rolling lift is a refinement patented in 1893 by American engineer William Donald Scherzer. [3] The rarer Rall type combines rolling lift with longitudinal motion on trunnions when opening. [4]
This design has been pioneered by the structural engineer Santiago Calatrava in 1992 with the Puente del Alamillo in Seville, Spain. In two of his designs the force distribution does not depend solely upon the cantilever action of the spar (pylon); the angle of the spar away from the bridge and the weight distribution in the spar serve to ...
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The Martin Luther King Bridge, of Port Arthur, Texas, is a cantilever bridge spanning the Sabine-Neches ship canal.It was opened in 1970 as the Gulfgate Bridge, [1] and allows Texas State Highway 82, a short (13 miles (21 km)) highway, to cross the canal and continue on Pleasure Island to the Texas-Louisiana border, connecting Port Arthur to Louisiana Highway 82.
A simple suspension bridge (also rope bridge, swing bridge (in New Zealand), suspended bridge, hanging bridge and catenary bridge) is a primitive type of bridge in which the deck of the bridge lies on two parallel load-bearing cables that are anchored at either end.