Abstract
In this paper, case studies were carried out to analyze the feasibility of submerged floating tunnels (SFTs) with suspension cables. In order to apply an SFT in a field site, the deformation of the system should be controlled, even under extreme wave conditions, if vehicles or trains operate inside the SFT. Two types of suspended SFTs were proposed to analyze their hydrodynamic behavior. The main variables were the wave conditions, cross-sectional diameters, buoyancy weight ratios, inclination angles of the main cables, and installation depth of the SFT. Overall, it was found that the SFT with a mid-anchor was superior from a hydrodynamic point of view. However, a detailed hydrodynamic analysis must be performed to avoid the conditions that previously produced slack. In addition, in a case where acceleration is generated by motion, the design should be reviewed to ensure safe conditions, according to the traffic passage.
Highlights
Submerged floating tunnels (SFTs) float underwater and have an innovative water-crossing typology, supported by Archimedes’ principle [1]
The even under extreme wave conditions if vehicles or trains operate inside the submerged floating tunnels (SFTs)
Variables were derived by analyzing the behavior of the SFT with suspension cables under irregular For slender structural beam members with a cross-sectional dimensions and insufficient planarity to allow the inclination of fluid velocities and the accelerations of particles in the normal flow direction to the beam member, to be neglected, the wave loads can be estimated using Morison’s load formula, which is the sum of an inertia force, proportional to the acceleration, and a drag force, which is proportional to the square of the velocity
Summary
Submerged floating tunnels (SFTs) float underwater and have an innovative water-crossing typology, supported by Archimedes’ principle [1]. While SFTs are placed underwater, they differ from the conventional immersed tunnels, which are placed directly on the seabed and are composed of segments. They have several structural or infrastructural issues. Xiang et al (2018) [8] studied the global dynamic response of an SFT under anchor-cable under failure, considering the post-breakage. Won and Kim (2018) [12] proposed a concept design for an SFT with an inclined cable, as an application form. In thisInstudy, a feasibility study study on theon applicability of an SFT with cables was conducted. The tower is a supporting component, component, like the tube and main cables.
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