Abstract
Submerged floating tunnel (SFT) is a new solution for the transportation infrastructure through sea straits, fjords, and inland waters and can be a good alternative to long span suspension bridges and immersed tunnels. The mooring cables/anchors are main structural components to provide restoring capacity to the SFT. The time domain dynamic problem of SFT moored by vertical and inclined mooring cables/anchors is formulated. The dynamic analysis of SFT subjected to hydrodynamic and seismic excitations is performed. As the cable stiffness determines the deformation ability of SFT, therefore it becomes crucial to evaluate the effect of mooring cable stiffness on the response of SFT. The displacements and internal forces of SFT clearly specify that the vertical/tension leg mooring cables provide very small stiffness as compared to inclined mooring cables. In order to keep the SFT displacements within an acceptable limit, the effect of cable stiffness should be properly evaluated for practical design of SFT.
Highlights
Submerged floating tunnel (SFT) is a novel structural solution for waterway crossings
The SFT is supposed to be a good alternative for waterway crossing as compared to long span suspension bridges and immersed tunnels especially for deep and wide crossings because the cost of SFT per unit length remains almost constant by increasing length [1]
This study presents the effect of cable stiffness on the dynamic response of submerged floating tunnel for hydrodynamic and seismic loadings
Summary
Submerged floating tunnel (SFT) is a novel structural solution for waterway crossings. It floats at a specified depth and is anchored by mooring cables. Most of the SFT numerical models developed so for, consider the dynamic response of SFT subjected hydrodynamic waves and seismic loadings [5,6,7]; the role of. Mooring cable stiffness in the dynamic response of an SFT is not investigated or evaluated in more detail. This study presents the effect of cable stiffness on the dynamic response of submerged floating tunnel for hydrodynamic and seismic loadings. The dynamic problem of the SFT is solved considering the modeling of cables, tunnel, hydrodynamic waves and currents and seismic loadings. The displacements and internal forces of SFT are presented and the effect of cable stiffness on the dynamic behaviors of the SFT have been discussed
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