Abstract
The collapse loads of orthotropic bridges continuous over isolated interior column supports are predicted by means of the yield-line theory. Equations for the collapse loads are derived for bridges of skew and rectangular planforms, and for an arbitrary angle of inclination of the line joining the centres of the interior columns. The analytical results are verified by experimental test results from prestressed concrete bridge models. Uniformly distributed and concentrated loads as well as Ontario Highway Bridge Design truck loading can be accommodated. A design example illustrating the use of the derived equations is presented. Key words: bridges (orthotropic), isolated supports, model tests, skew, structural engineering, ultimate load.
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