Which deck type is most suitable for reduced dead load and easier installation, commonly found on moveable bridges?

Which deck type is most suitable for reduced dead load and easier installation, commonly found on moveable bridges?

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

Answer: (D)

When building moveable bridges, you want a deck that keeps dead load low and can be installed quickly. The grid deck achieves this because its open-grid pattern uses lightweight elements, cutting the overall weight compared with solid steel or concrete decks. Sections can be manufactured off-site and placed with relatively simple erection, avoiding heavy formwork and extensive finishing work. The open spaces also improve drainage and make inspection and maintenance beneath the deck easier—an important factor on spans that move and endure weather exposure. While other deck types can offer strength, they typically come with more weight and more complex fabrication or installation requirements, making grid decks the best fit for reduced dead load and faster installation on movable bridges.

When building moveable bridges, you want a deck that keeps dead load low and can be installed quickly. The grid deck achieves this because its open-grid pattern uses lightweight elements, cutting the overall weight compared with solid steel or concrete decks. Sections can be manufactured off-site and placed with relatively simple erection, avoiding heavy formwork and extensive finishing work. The open spaces also improve drainage and make inspection and maintenance beneath the deck easier—an important factor on spans that move and endure weather exposure. While other deck types can offer strength, they typically come with more weight and more complex fabrication or installation requirements, making grid decks the best fit for reduced dead load and faster installation on movable bridges.