Which element supports the deck or riding surface?

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Multiple Choice

Which element supports the deck or riding surface?

Explanation:
The key idea is the load path: the deck or riding surface sits on the main load-carrying part of the bridge, which is the superstructure. The superstructure includes the girders/frames and the deck itself that directly carry traffic loads and transmit them to the bearings. Those bearings then transfer the load down to the substructure, which supports everything through piers, abutments, and foundations. The bearing’s job is to connect the superstructure to the substructure and accommodate movement, not to carry the deck on its own. A culvert, by contrast, is just a water-conveying channel and doesn’t support the deck.

The key idea is the load path: the deck or riding surface sits on the main load-carrying part of the bridge, which is the superstructure. The superstructure includes the girders/frames and the deck itself that directly carry traffic loads and transmit them to the bearings. Those bearings then transfer the load down to the substructure, which supports everything through piers, abutments, and foundations. The bearing’s job is to connect the superstructure to the substructure and accommodate movement, not to carry the deck on its own. A culvert, by contrast, is just a water-conveying channel and doesn’t support the deck.

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