The Future of the Tunnel Crossing: The Submerged Floating Tube Bridge

Eng., Arianna Minoretti Civil; Xu, Xipeng; Johansen, Inger Lise; Eidem, Mathias Egeland

doi:10.1080/10168664.2020.1775165

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…An anchored SFT typically consists of a tube, end constraints, and the on-way support system. It suspends at a specific water depth through buoyancy force to balance the weight of the tunnel, with a mass ratio m* < 1 and natural frequency ratio R f < 1 [1][2][3][4]. Compared to traditional water crossing structures, anchored SFTs offer several advantages, including flexible on-way configurations and sections, minimal impact on navigation and the ecological environment, better adaptability to water depth and topography, improved spanning capacity, and lower construction costs.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Two-Degree-of-Freedom Flow-Induced Vibration of a Submerged Floating Tunnel under Current

Wang,

Zhang,

Huang

et al. 2024

JMSE

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The submerged floating tunnel (SFT) is a novel form of transportation infrastructure for crossing deeper and wider seas. One of the primary challenges in designing SFTs is understanding their hydrodynamic response to complex environmental loads. In order to investigate the two-degree-of-freedom (2-DOF) flow-induced vibration (FIV) response of SFTs under current, a two-dimensional (2D) numerical model was developed using the Reynolds-averaged Navier–Stokes (RANS) method combined with the fourth-order Runge–Kutta method. The numerical results were validated by comparing them with the existing literature. The study then addressed the effects of coupled vibration and structural parameters, i.e., the mass ratio and natural frequency ratio, on the response and wake pattern of SFTs, numerically. The results indicated that coupled vibration had a significant impact on the SFT response at reduced velocities of Urwx ≥ 4.4. A decrease in mass ratio (m* < 1) notably amplified the 2-DOF vibration amplitudes of SFTs at Urwx ≥ 4.4, particularly for in-line vibration. Similarly, a decrease in natural frequency ratio (Rf < 1) significantly suppressed the in-line vibration of SFTs at Urwx ≥ 2.5. Therefore, for the design of SFTs, careful consideration should be given to the effect of mass ratio and natural frequency ratio on in-line vibration.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Two-Degree-of-Freedom Flow-Induced Vibration of a Submerged Floating Tunnel under Current

Wang,

Zhang,

Huang

et al. 2024

JMSE

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“…The tube is suspended in the water by its buoyancy, gravity and the supporting force of the cables. The cables need to be connected with the anchor mounds at the bottom of the sea to realize the stability of the whole system [1,2]. It can be found that the suspended tunnel is less restricted by the span and water depth from structural features [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the simplified model has certain accuracy. (2) The interaction between cable and tube are often considered by an approximate coupling method that simulate the cable as a tension string. In cable vibration analysis, the dynamic strain can be estimated according to its cross vibration amplitude and the displacement of position of the tunnel at the upper end of the cable along the direction of the string line to obtain the dynamic cable force.…”

Section: Introductionmentioning

confidence: 99%

Coupling Vibration Model of Submerged Floating Tunnel in Space

Li¹,

Zhang²,

Liu³

et al. 2022

J Nonlinear Math Phys

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Submerged floating tunnel is a new type of traffic building structure under water surface which can span various water courses. The structure has the characteristics of high flexibility and low damping so that vibration problems would be caused by hydrodynamic excitation. Long-term vibration problems could affect the safety and durability of the structure. Therefore, it is necessary to accurately understand the dynamic behavior of the floating tunnel under hydrodynamic excitation. This paper proposes a simplified three-dimensional model to study vibration of the structure for the excitation. Based on the Galerkin method and the mode superposition method with the boundary conditions, the dynamic differential equations of the structure were established in Generalized coordinate system. The $$Newmark - \beta$$ N e w m a r k - β method is used to solve the equations. Then, adopting FEA (Finite Element Analysis) method to establish the finite element model of the submerged floating tunnel. The result verified the accuracy of the present model. Based on the present model for parameter analysis, the following conclusions are: displacement coordination at the connection position affects the cables’ dynamic behavior greatly compared to tube. Current and horizontal component of wave have significant impact on dynamic response of tube. While the vertical wave component influences cable greatly.

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“…This project is aimed at establishing a coastal highway route without ferry connections. New large concrete structures, including a submerged floating tunnel (SFT), 43 need to be built to cross the wide and deep fjords along the coast. It is then of interest to evaluate the combined action of fire and blast loads inside tunnels 44 .…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics of reinforced concrete circular slabs subsequently subjected to fire exposure and static load: An experimental study

Barenys

Colombo

Martinelli

et al. 2022

Structural Concrete

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This study investigated the effect of fire on the ultimate load‐bearing capacity of reinforced concrete (RC) slabs. The structural response of RC circular specimens subjected to static load conditions after exposure to a hydrocarbon fire on one side of the specimen was examined. Two fire exposure times were considered (60 and 120 min) in addition to reference non‐exposed specimens. The static response was evaluated in the damaged specimens in residual conditions after natural cooling from the elevated temperatures. The temperature distribution across the thickness of the slabs and their load–displacement response was measured. The decrease in the stiffness of the slabs due to the thermal exposure was studied by means of direct ultrasonic pulse velocity (UPV) measurements made before and after the fire tests. The decrease in global stiffness was partially accounted for by UPV measurements. The experimental results showed two peaks in the load‐deflection response of the slabs. The first peak was related to an arching mechanism introduced by the specific set‐up used. The second peak, corresponding to the ultimate load, occurred due to tensile membrane action at large deflections. While the former was strongly affected by the fire exposure, with the load being halved after the 120‐min exposure, the latter was not greatly affected by either the presence of fire or the exposure time. Simplified mechanical models were used to explain the behavior of the RC slabs during the tests.

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The Future of the Tunnel Crossing: The Submerged Floating Tube Bridge

Cited by 8 publications

References 8 publications

Numerical Simulation on the Two-Degree-of-Freedom Flow-Induced Vibration of a Submerged Floating Tunnel under Current

Numerical Simulation on the Two-Degree-of-Freedom Flow-Induced Vibration of a Submerged Floating Tunnel under Current

Coupling Vibration Model of Submerged Floating Tunnel in Space

Failure characteristics of reinforced concrete circular slabs subsequently subjected to fire exposure and static load: An experimental study

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