Which term describes the structural equipment installed between a bridge's substructure and superstructure to transfer loads?

• A. Deck
• B. Bridge bearing
• C. Column
• D. Buckling

Answer: (B)

The component that sits between the bridge’s substructure and superstructure and transfers loads from the upper parts down to the supports is the bridge bearing. Bearings carry vertical loads from the deck and girders and pass them to the piers or foundations, while also allowing controlled movement to accommodate thermal expansion, contraction, settling, and dynamic forces. They can also provide some rotational freedom and, in some designs, limited sliding to reduce stresses in the superstructure. This distinguishes a bearing from the deck (the roadway surface), from a column (a vertical support member), and from buckling (a failure mode in compression members). Bearings are essential for maintaining the intended load path and longevity of the bridge by isolating movements and distributing loads smoothly.