| 摘要 |
Single span arch bridge, of suspended deck type, with foundations onshore, fit to cross bodies of water also very large (> 3 km) . Buoyant foundations and antidrift diaphragms make it insensitive to the possible soil liquefaction. Buildable in cantilever mode and self-supporting, then without scaffoldings nor stays and provisional poles and without resorting to underwater operations. A preferential but not exclusive architectural modality provides the balancing of the thrusts by means of ties independent from the deck, obtaining then, in this way, a tied arch bridge. Clusters of jacks placed in the key induce a permanent and variable constraint condition, fit to optimize in real time the stress condition of the bridge, which then behaves as an intelligent structure. The presence of several structural tensioned components as ties, vertical strings and bracings predisposes the structure to a selective use of innovative materials of very high mechanical properties, very light, resistant to fatigue and to the aggressiveness of the environment, free from maintenance .
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