Feasibility study of submerged floating tunnels with vertical and inclined combined tethers

Jeong, Kiwon; Min, Seongi; Jang, Mi-Ae; Won, Deokhee; Kim, Seungjun

doi:10.1016/j.oceaneng.2022.112587

Cited by 16 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the new type of scale model of SFTs proposed in this study, the similarity ratios between the model and its prototype must adhere to all the above formulas, except for Equation (7), to fulfill the requirements for geometric similarity, motion similarity, and the Froude similarity principle and the Cauchy similarity principle within dynamic similarity.…”

Section: Dynamic Similaritymentioning

confidence: 99%

“…Numerical simulation is a valuable and essential tool in the study of SFTs. The numerical model usually needs to be calibrated to prove it can accurately reflect the inherent dynamic characteristics of SFTs, and the subsequent parameter analysis based on the numerical model is valuable [5][6][7][8]. The simplified numerical model is widely favored due to its rapid computation speed and acceptable accuracy.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design and Evaluation of Novel Submerged Floating Tunnel Models Based on Dynamic Similarity

Ren,

Guo,

Liu

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Submerged floating tunnels (SFTs), also known as the Archimedes Bridge, are new transportation structures designed for crossing deep waters. Compared with cross-sea bridges and subsea tunnels, SFTs offer superior environmental adaptability, reduced construction costs, and an enhanced spanning capacity, highlighting their significant development potential and research value. This paper introduces a new type of SFT scale model for hydrodynamic experiments, adhering to the criteria for geometric similarity, motion similarity, and dynamic similarity principles, including the Froude and Cauchy similarity principles. This model enables the accurate simulation of the elastic deformation of the tunnel body and complex hydrodynamic phenomena, such as fluid–structure interactions and vortex–induced vibrations. Moreover, this paper details the design methodology, fabrication process, and method for similarity evaluation, covering the mass, deflection under load, natural frequency in air, and the natural frequency of the various underwater motion freedoms of the model. The results of our experiments and numerical simulations demonstrate a close alignment, proving the reliability of the new SFT scale model. The frequency distribution observed in the white noise wave tests indicates that the SFT equipped with inclined mooring cables experiences a coupled interaction between horizontal motion, vertical motion, and rotation. Furthermore, the design methodology of this model can be applied to other types of SFTs, potentially advancing technical progress in scale modeling of SFTs and enhancing the depth of SFT research through hydrodynamic experiments.

show abstract

Section: Dynamic Similaritymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of Novel Submerged Floating Tunnel Models Based on Dynamic Similarity

Ren,

Guo,

Liu

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Te SFT model was simultaneously subjected to (1) wave and current loadings and (2) uniformly distributed loading with random amplitudes in both the horizontal and vertical directions, as shown in Figure 7(c). Te hydrodynamic environment was simulated using ABAQUS/Aqua, which has been commonly used in previous studies [36][37][38]. However, the real hydrodynamic environment may be more complex [39], and more research is needed to consider this.…”

Section: Numerical Validationmentioning

confidence: 99%

Simultaneous Estimation of Submerged Floating Tunnel Displacement and Mooring Cable Tension through FIR Filter-Based Strain and Acceleration Fusion

Choi

Jang

et al. 2023

Structural Control and Health Monitoring

View full text Add to dashboard Cite

A submerged floating tunnel (SFT) is a tunnel structure that floats approximately 50 m below the water surface and is anchored to the seabed by mooring cables. It is a new alternative to conventional bridges and immersed tunnels. There have been ongoing efforts to construct SFTs worldwide, and the integrity of these SFTs needs to be monitored throughout their lifespan. This study simultaneously estimated the tunnel displacement and mooring cable tension force using acceleration and strain measurements to assess the integrity of an SFT. First, strain measurements were transformed to displacement using simplified mode shapes and mode-scaling factors, which did not require the true mode shapes of the SFT. The mode-scaling factors were automatically estimated using initial strain and acceleration measurements. Then, the strain-based displacement was combined with the acceleration measurement using a finite impulse response filter to improve the displacement estimation accuracy. In addition, the tension force of a mooring cable was estimated from the displacement at the connection between the tunnel and mooring cable. The feasibility of the proposed technique was examined through a series of numerical simulations and laboratory tests on an 8 m-long aluminum SFT mock-up structure.

show abstract

“…The results show that the inclined mooring system is more effective in restricting SFT movement compared to the vertical mooring system. Jeong et al [7] analyzed the feasibility of the SFT with a mooring system combining vertical and inclined tethers by using the finite element program ABAQUS-AQUA and pointed out that it could be effectively applied when the spacing is less than 40.0 m and the inclination angle is 45.0 degrees. Lee et al [8] used numerical software OrcaFlex and CHARM3D to simulate the dynamic responses of two types of SFTs under the waves and seismic excitations in the time domain.…”

Section: Introductionmentioning

confidence: 99%

Optimization Analysis of the Arrangement of the Submerged Floating Tunnel Subjected to Waves

Pan,

Cui,

Chen

et al. 2024

JMSE

View full text Add to dashboard Cite

The motion responses, mooring tensions, and submergence depth are the dominant factors for the arrangement of the Submerged Floating Tunnel (SFT) subjected to waves. Generally, the maximum values of motion responses, mooring tensions, and absolute submergence depth are mainly focused on. In the present study, experiments are implemented to measure the motion responses and mooring tensions of the SFT with different mooring patterns and submergence depths under waves with different characteristic wave heights and periods. In order to evaluate the arrangement of the SFT more effectively and comprehensively, besides the maximum values, several new characteristic parameters are introduced. Such parameters account for the motion responses in the frequency domain, the uniformity of the tension distribution, the length of time during which the cable reaches a relaxed condition during wave action, the KC number, the dimensionless period, the wave height, and the submergence depth. The results from the optimization analysis show the following: according to the characteristic values of motion responses and mooring tensions, the pattern of diagonal cables is better than that of diagonal cables + vertical cables; and within the range of the present experiments, there are optimal dimensionless parameters—the dimensionless submergence depth d0/LP ≥ 0.15, the KC number ≤ 0.8, or the dimensionless wave height Hs/d0 ≤ 0.10—for the condition of which the dynamic responses and mooring tensions vary slightly.

show abstract

Feasibility study of submerged floating tunnels with vertical and inclined combined tethers

Cited by 16 publications

References 25 publications

Design and Evaluation of Novel Submerged Floating Tunnel Models Based on Dynamic Similarity

Design and Evaluation of Novel Submerged Floating Tunnel Models Based on Dynamic Similarity

Simultaneous Estimation of Submerged Floating Tunnel Displacement and Mooring Cable Tension through FIR Filter-Based Strain and Acceleration Fusion

Optimization Analysis of the Arrangement of the Submerged Floating Tunnel Subjected to Waves

Contact Info

Product

Resources

About