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Reference.org
Tied-arch bridge
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<p>A tied-arch bridge is an <a href="/facts/Arch_bridge/oGQeFjp2">arch bridge</a> in which the outward-directed horizontal forces of the arch(es) are borne as tension by a chord tying the arch ends rather than by the ground or the bridge foundations. This strengthened chord may be the deck structure itself or consist of separate, independent tie-rods. </p>