Arch can be used for long span bridge.
When the arch
extends above the deck level, lighter deck such as steel or composite decks are
preferable. On the other hand, concrete deck is suitable for arch that remains
below the deck level.
Due to the
structural configuration, the arch section is naturally compressed and does not
need prestressing.
Columns are built
on arch to support the deck.
In situ slab or
box girders, precast beams and launched box girders are usable for concrete
deck.
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