Experimental study on the drag forces on a twin-tube submerged floating tunnel segment model in current

Deng, Shi; Ren, Haojie; Yang, Xu; Fu, Shixiao; Moan, Torgeir; Gao, Zhen

doi:10.1016/j.apor.2020.102326

Cited by 16 publications

(5 citation statements)

References 32 publications

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“…Although in the past decade, scholars or engineers from the world have done a lot of researches and exploration, which includes the preliminary design of engineering structures, the combination of SFT load and limit state design method, mechanical analysis and dynamic response behavior of SFTs and components , fluid-structure coupling mechanism [17,19,[35][36][37], the experimental test and study [35,[38][39][40][41][42][43][44][45][46], the behavior of SFTs under action of accidental load, such as, preliminary studies on vibration response mechanism and prevention measures under general impact load, seismic excitation, explosion and blast impacts and partial failure of anchor cables [4,[19][20][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62], and corresponding construction simulation [63], construction technologies and equipment, durability analysis, smart monitoring and early warning system of anchor cables, SFT and environment [64][65][66]. But the working behavior and mechanism of the SFT under complex sea waters is not very clear, there is a certain distance from making the specification of design and construction methods or guide for SFT etc.…”

Section: Characteristics and Research Status Of Sftmentioning

confidence: 99%

Solution to the traffic problems of long and deep water straits–smart submerged floating tunnel and its research

Xiang

Chen

Shen

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Submerged floating tunnel (SFT) is a new type of structure across long and deep water straits and waterways with good application prospects. The structure is different from the traditional large-span bridges and immersed tunnels, which can effectively avoid difficulty under the construction of bridges foundation in deep water straits and channel, the high cost of large span bridge, influence of typhoons and heavy fog et al. severe weather on the vehicle driving on the bridges, a series of technical problems confronted under the construction of immersed tunnel or tunnel excavation in complex marine geology and the deep sea and risk control and so on. This paper, in the light of the characteristics of submerged floating tunnels and the requirements of marine deep water environment, discusses some of technical challenges faced in the designing and building the SFT, points out that it is necessary to systematically study the design and load condition, the smart composite material and shape optimization, the calculation theory and method for analyzing the structural behavior, the structure safety evaluation, construction methods and key technology, and engineering risk analysis, smart monitoring, evaluation and control, code or guide for design and construction of SFT. It lays foundation for design, construction and engineering risk analysis, etc. of submerged floating tunnel across the long and deep waterways in the future.

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Section: Characteristics and Research Status Of Sftmentioning

confidence: 99%

Solution to the traffic problems of long and deep water straits–smart submerged floating tunnel and its research

Xiang

Chen

Shen

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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show abstract

“…When the submergence depth is more than 40 m, the motion response of the tube will decrease more significantly. Deng et al [15] experimentally investigated the drag force on a double-tube SFT with different Reynolds numbers and submergence depths using a simplified rigidly connected tandem twin-cylinder model under strong current. The results show that both the vortex-induced vibration response and mean drag coefficient decrease with the decrease in the submerged depth, especially when the depth ratio h* < 3.7 (h* = h/D, where h is the distance from the bottom of the SFT to the initial free surface and D is the outer diameter of the SFT).…”

Section: Introductionmentioning

confidence: 99%

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

Pan,

Cui,

Chen

et al. 2024

JMSE

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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.

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“…A widely adopted approach is utilizing a rigid segment model connected with springs and dampers to simulate the middle segment of the SFT. In order to research the drag forces and vortexinduced vibration effects of the model under the action of current, Deng et al [25] employed a rigidly connected twin-cylinder model, which was elastically mounted between two support frames. Yang et al [26] utilized a single-degree-of-freedom, vertical elastically truncated boundary model to investigate the dynamic response of SFTs under wave action.…”

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

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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.

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Experimental study on the drag forces on a twin-tube submerged floating tunnel segment model in current

Cited by 16 publications

References 32 publications

Solution to the traffic problems of long and deep water straits–smart submerged floating tunnel and its research

Solution to the traffic problems of long and deep water straits–smart submerged floating tunnel and its research

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

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

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