Which type of bearing is not the same as integral abutments?

Integral abutments are a specific type of bridge support system where the abutment and the bridge deck are cast monolithically, meaning they function as a unified structure without traditional expansion joints or bearings. This design allows for more efficient load transfer and mitigates issues with thermal expansion and contraction.

Enclosed bearings, often used to accommodate movements between bridge components while containing them within a seal or housing, differ significantly from integral abutments. Unlike enclosed bearings, which allow for movement and are typically separate elements, integral abutments inherently eliminate the need for separate bearing components because they are designed to move as one continuous unit without any transition points or additional moving parts.

The other types of bearings listed—rocker bearings, moveable bearings, and sliding plate bearings—are all designed to facilitate some form of movement or adjustment between the superstructure and supports. These bearings provide articulation and flexibility, which are not features of integral abutments. Hence, the nature of enclosed bearings being an independent component meant to handle specific movements makes it distinctly different from the integral abutment design.