Which component transmits loads, permits longitudinal movement and allows rotation?

• A. Substructure
• B. Cast-in-place Concrete
• C. Embankment
• D. Bearings

Answer: (D)

Bearings are the interface that carries the bridge’s loads from the superstructure to the supports while allowing controlled movement and rotation. They’re designed to transfer vertical forces and also accommodate longitudinal movement from temperature changes, live loads, and other shifts, as well as rotation to accommodate any angular misalignment or settlement at the supports. Substructure elements like piers and foundations transmit loads but are typically fixed and restrained, not meant to permit such movement. Cast-in-place concrete is a material, not a separate mechanism for movement, and an embankment is the ground material that supports the structure but doesn’t provide a designed jointed interface for movement and rotation. So the bearing best fits the function described.