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The same structural effects are also true of the concrete slab in a composite girder bridge, but the steel orthotropic deck is considerably lighter, and therefore allows longer span bridges to be more efficiently designed. Resistance to use of an orthotropic deck relates mainly to its cost of fabrication, due to the amount of welding involved.
The deck is the roadway or walkway surface. In roadway applications it is usually a poured reinforced concrete slab, but can also be a steel grid or wood plank. The deck includes any road lanes, medians, sidewalks, parapets or railings, and miscellaneous items like drainage and lighting.
The Hoover Dam Bypass project was completed within budget at a cost of $240 million; the bridge portion cost $114 million. [4] The bridge was the first concrete-steel composite deck arch bridge built in the United States, [5] and incorporates the widest concrete arch in the Western Hemisphere.
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Metal deck and open web steel joist receiving spray fireproofing plaster, made of polystyrene-leavened gypsum. Steel loses strength when heated sufficiently. The critical temperature of a steel member is the temperature at which it cannot safely support its load [citation needed]. Building codes and structural engineering standard practice ...
A month later, six construction contracts worth $42.5 million were awarded, representing nearly half of the span's cost. [49] The contract for the suspension towers' metal was awarded to Bethlehem Steel at a cost of $10.2 million, and the contract for the towers' concrete went to Merrit, Chapman and Scott for $7.5 million.
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