This Case Study focus on a six-span, 281.5m long bridge which was widened 20- years after the initial bridge was completed. During a routine bridge inspection, transverse deck displacement was observed at the endblocks. Bearing distress was also observed, particularly at the abutments. Visual findings and close-up bearing inspections indicated the failure of the transversely restrained abutment bearings, with resultant lateral deck movement, parapet spalling, and dowel deformation, while the pier bearings remained generally serviceable. A high-level structural analysis indicates that differential creep and shrinkage between the original and widened decks post stitching were the most probable cause of the induced restraint forces and bearing failure.
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