Degree of Freedom is an international civil and structural engineering practice with offices in Oslo, Valencia and Athens. We design bridges, buildings and special structures, in timber, steel, and concrete. We are architecture oriented and innovative.
The bridge is an approximately 550m long signature road bridge crossing Randselva near Kistefoss. Preliminary design stage has narrowed down to two alternatives; one steel and one concrete option. Degree of freedom being engineers of the steel alternative, Multiconsult the concrete one. The steel alternative consists of a composite deck solution over concrete columns. The bridge has a constant horizontal radius of 1050 meters, and the depth of the deck construction varies and has a constant slope of 2.7%. The maximum height over the ground is about 50 meters.
The bridge deck is supported, in addition to the abutments in each end, on two intermediate V-shaped supports located symmetrically from the center of the bridge. The bridge deck is typically 5 meters deep, but is reinforced above these V-supports. The maximum depth at these locations is 10 meters. The main challenge is to span about 175m between one of the two V-supports and the southern abutment that bears on top of an inaccessible and unstable hill. That is a reason why V-shaped supports are used. These supports reduce the effective span. The erection is based on a steel deck with a constant depth of 5 meters which is incrementally launched, sliding over the supports. The deck cross section consists of a composite steel trapezoidal box, with a top concrete deck acting as the top flange and 3.25 meters long cantilevers each side of the section.
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