If a load is placed on the deck, it is transferred to the arch via the hangers, as the global stiffness of the arch is greater than the bending stiffness of the deck. The arch is held longitudinally at one end, with the other end free to expand or contract under varying temperatures. Looking at the diagram above, it can be seen that a tied-arch is really just a simply supported beam. It can be seen that one end will still require a longitudinal restraint to carry wind, braking, acceleration and skidding forces, and that the other end is permitted to move longitudinally. The tied-arch is sometimes referred to as a bowstring arch.īy taking the arch thrust through the tie member, the primary requirement for the substructure reduces to only carrying vertical loads. The tied-arch offers a solution when it can be arranged that the deck is at such a level that it can carry the horizontal force as a tie member, as shown below.
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