| 摘要 |
The application concerns the controlled addition of stiffness to arch bridge structures, through definitive ties systems (3), prestressed between external anchorages (8) and the arch (1) or the deck (2), in order to mobilize reactions and reduce the structure weight. A reduced flexural stiffness of slender arches and thin decks is compensated by the addition of prestressed ties. The mobilization of the prestressed ties stiffness in tension or relative compression, results in forces that directly balance the external loads, transmitting them to the foundations. On the other hand, the system of ties associated with the slender arch and the thin deck, enables equilibrium of loads for which the arch does not have anti-funicular, shape, such as variable live loads. The external anchored definitive ties system is responsible for balancing of variable loads, so that the bending stiffness and strength of arch and deck can therefore be reduced. |
