Which deck is found on many older bridges and movable bridges?

Which deck is found on many older bridges and movable bridges?

• A. Concrete
• B. Timber
• C. Steel
• D. Masonry

Answer: (C)

Steel decks show up on many older bridges and especially on movable ones because steel offers the strength and flexibility needed for moving sections. Steel can be fabricated into long, durable panels that fit between girders and can tolerate the loads and dynamic movement of lifting or swinging spans. It also allows for easier maintenance—damaged plates can be replaced without rebuilding the entire deck—and it keeps the weight manageable for the moving mechanisms. Concrete decks are heavier and harder to repair around moving parts; timber decks, while lighter, are prone to rot and maintenance issues; masonry decks aren’t suitable for spans that need to move.

Steel decks show up on many older bridges and especially on movable ones because steel offers the strength and flexibility needed for moving sections. Steel can be fabricated into long, durable panels that fit between girders and can tolerate the loads and dynamic movement of lifting or swinging spans. It also allows for easier maintenance—damaged plates can be replaced without rebuilding the entire deck—and it keeps the weight manageable for the moving mechanisms. Concrete decks are heavier and harder to repair around moving parts; timber decks, while lighter, are prone to rot and maintenance issues; masonry decks aren’t suitable for spans that need to move.