The double composite box girder over interior piers for a three span continuous bridge isdesigned for negative flexure and shear. The lengths of the central span considered are 80m, 100m, and120m. The flexural resistance of the girder is calculated by the method of layerwise material nonlinearsectional analysis, modeling of the steel was by an elasto-plastic strain-hardening material, and the lowerconcrete slab by the CEB-FIB model. The predicted moment-curvature response is compared with that bythe material nonlinear analysis of ABAQUS. For the service limit state check of web bend-buckling, thedepth of web in compression is calculated by the mechanics of materials approach. Based on AASHTOLRFDspecifications, the shear buckling of web for strength limit state and the bend-buckling of web forservice limit state are considered. The moment-curvature behaviour, the stress distribution through thedepth of girder, the performance ratios, and the material savings of steel girder are analyzed.
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