Which type of deck is constructed with timber planks laid flat transversely across the superstructure?

Which type of deck is constructed with timber planks laid flat transversely across the superstructure?

• A. Plan deck
• B. Nail laminated deck
• C. Stress laminated
• D. Wearing surface

Answer: (A)

The essential idea is how timber decks are arranged on the bridge. A plan deck is built by laying timber planks flat across the superstructure, meaning the planks run perpendicular to the girders and form a flat, transverse surface. That description—timber planks laid flat transversely across the structure—matches plan deck precisely. It differs from nail-laminated or stress-laminated decks, which involve laminated layers or prestressing, and from wearing surface, which refers to the top finish rather than the basic deck construction method. Plan decks are the straightforward transverse plank decks that create a level riding surface across the span.

The essential idea is how timber decks are arranged on the bridge. A plan deck is built by laying timber planks flat across the superstructure, meaning the planks run perpendicular to the girders and form a flat, transverse surface. That description—timber planks laid flat transversely across the structure—matches plan deck precisely. It differs from nail-laminated or stress-laminated decks, which involve laminated layers or prestressing, and from wearing surface, which refers to the top finish rather than the basic deck construction method. Plan decks are the straightforward transverse plank decks that create a level riding surface across the span.