Abstract Blisters—the localized anchorage blocks in box girder bridges—are critical structural elements that transfer concentrated post-tensioning forces into the girder body. When damaged, they represent a significant structural vulnerability requiring immediate attention. This comprehensive article details standardized methodologies, safety protocols, and engineering practices for repairing damaged blisters, drawing from AASHTO, Eurocode, and UK Highways England standards.

Abstract Blisters—localized thickenings or protrusions in the webs or flanges of box girders—serve as essential structural details for anchoring post-tensioning tendons and resisting concentrated loads. This article explores the multifaceted significance of blisters, detailing their design principles, geometric and placement considerations, and repair methodologies. Emphasizing their role in stress distribution, durability, and structural safety, the discussion underscores wh