What is the primary function of the bridge superstructure?

What is the primary function of the bridge superstructure?

• A. Supports the deck or riding surface
• B. Transmits loads, permits longitudinal movement and allows rotation
• C. Transfers the loads from the superstructure to the foundation soil or rock
• D. Can be designed to meet the specific requirements of a site

Answer: (A)

The primary function of the bridge superstructure is to support the deck or riding surface, carrying the traffic loads across the span. It provides the main load path from the roadway to the supporting bearings and elements above the foundation. The other aspects—transferring loads to the foundation (substructure), permitting movement and rotation (bearings and connections), and site-specific design considerations—describe other roles or design factors, not the core purpose of the superstructure itself.

The primary function of the bridge superstructure is to support the deck or riding surface, carrying the traffic loads across the span. It provides the main load path from the roadway to the supporting bearings and elements above the foundation. The other aspects—transferring loads to the foundation (substructure), permitting movement and rotation (bearings and connections), and site-specific design considerations—describe other roles or design factors, not the core purpose of the superstructure itself.