A new challenge for strait crossings: the immersed inversed cable supported bridge

       ABSTRACT: Submerged Floating Tunnels (SFT) represent an innovative technical solution in the field of waterway crossings. They are tubular structures, submerged in the water at a fixed depth, which exploit the bearing capability offered by the Archimedes buoyancy. The tunnel is fixed in position through anchorage systems made up of cables linked to the seabed. The anchorage system has to be conceived so that the tunnel is properly constrained, minimizing the displacements and stresses induced by the environmental loadings, such as the hydrodynamic actions. In general, several similarities can be noticed between the SFT and the traditional cable supported bridges, that is, suspension bridges and cable stayed bridges: the bridge deck is supported through vertical or inclined cables; the load conditions are analogous, the gravity loads on the cable supported bridges being replaced by the upward residual buoyancy in the SFTs and the role of wind being played by currents and waves actions; the bridge girder can be realized with a multi cell cross-section having an aerodynamic shape. SFTs can therefore be conceived as immersed inversed cable supported bridges. This paper deals with this concept, investigating the chance of transferring the knowledge and ideas developed in the cable supported bridges field to the SFTs one.

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中国交建 TEC TU 天科院 大连理工大学

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