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ANALYSIS AND DESIGN OF SKEW BOX GIRDER BRIDGES
Craig D. Comartin, Alex C. Scordelis
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Abstract
A DETAILED PRESENTATION IS GIVEN OF THE REDUCTION, ANALYSIS, AND INTERPRETATION OF THEORETICAL RESULTS OBTAINED USING A FINITE ELEMENT COMPUTER PROGRAM CELL TO ANALYZE A SERIES OF SINGLE SPAN, SIMPLY SUPPORTED, FOUR CELL, SKEW BOX GIRDER BRIDGES HAVING VARYING ANGLES OF SKEW AND SPAN LENGTHS. THESE THEORETICAL RESULTS ARE COMPARED WITH EXPERIMENTAL RESULTS FROM A PREVIOUS STUDY ON ALUMINUM MODEL BRIDGES OF IDENTICAL DIMENSIONS. THIS INVESTIGATION OF THE BEHAVIOR OF THE SKEW BOX GIRDER BRIDGES INCLUDES A STUDY OF REACTIONS, INTERNAL LONGITUDINAL STRESSES, EXTERNAL AND INTERNAL TOTAL SECTION MOMENTS, TRANSVERSE DISTRIBUTION OF THE TOTAL MOMENT TO EACH GIRDER, AND THE EFFECTS OF THE ADDITION OF A MIDSPAN DIAPHRAGM. BOTH POINT LIVE LOADS AND DEAD LOAD ON THE BRIDGES ARE CONSIDERED. ON THE BASIS OF THESE RESULTS, AN APPROXIMATE SIMPLIFIED METHOD OF ANALYSIS IS PROPOSED. FINALLY SOME TENTATIVE RECOMMENDATIONS FOR THE DESIGN OF SKEW BOX GIRDER BRIDGES ARE MADE. /AUTHOR/