Which deck type becomes the top flange of the floor system due to its integration with the steel superstructure?

Which deck type becomes the top flange of the floor system due to its integration with the steel superstructure?

• A. Orthotropic decks
• B. Grid decks
• C. Steel decks
• D. Concrete decks

Answer: (A)

Orthotropic decks are steel decks reinforced with longitudinal ribs and transverse stiffeners that are tightly connected to the steel frame. When this deck is integrated with the steel superstructure, it functions as the top flange of the floor system, forming a single composite beam with the supporting girders. This means the deck itself carries bending loads and works with the beams to resist floor bending, providing high stiffness with relatively light weight. Other deck types serve mainly as surface or non-integrated elements and do not form the top flange as part of the steel frame.

Orthotropic decks are steel decks reinforced with longitudinal ribs and transverse stiffeners that are tightly connected to the steel frame. When this deck is integrated with the steel superstructure, it functions as the top flange of the floor system, forming a single composite beam with the supporting girders. This means the deck itself carries bending loads and works with the beams to resist floor bending, providing high stiffness with relatively light weight. Other deck types serve mainly as surface or non-integrated elements and do not form the top flange as part of the steel frame.