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Experimental Study on Hydrodynamic Load Characteristics for A Typical Cross-Section of A Submerged Floating Tunnel
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作者 ZHANG Hong-qian YANG Zhi-wen +2 位作者 LI Shao-wu YUAN Chun-guang ZHANG Hua-qing 《China Ocean Engineering》 SCIE EI CSCD 2024年第5期893-903,共11页
The typical cross-sectional form of a submerged floating tunnel plays a significant role in the dynamic response of the tunnel itself,which directly affects the overall design.In this work,a series of experiments invo... The typical cross-sectional form of a submerged floating tunnel plays a significant role in the dynamic response of the tunnel itself,which directly affects the overall design.In this work,a series of experiments involving wave action on a submerged floating tube cross section is reported to study its hydrodynamic load characteristics.Two typical cross section tube cylinders,circular and rectangular,are chosen.Experiments are carried out in a wave flume with waves of relatively low Keulegan-Carpenter(KC)numbers.Three relative depths of submergence of 0,0.25 and 0.5 are chosen.The measured wave forces in regular waves are used to analyze the horizontal force,vertical force and torque,and then the drag coefficient(Cd)and inertia coefficient(Cm)are derived.The results show that the drag coefficients at low KC numbers are large and decrease sharply with increasing KC number.The inertial coefficient Cm values in the vertical direction are about 70%larger than those in the horizontal direction.With an increase in aspect ratio(the ratio of the height to width of the structure),the ratio of inertia coefficient in the horizontal direction to that in the vertical direction increases remarkably.The inertia force coefficient is very sensitive to the submerged water depth and aspect ratio.The existing results may overestimate the actual force value. 展开更多
关键词 submerged floating tunnel tube cylinder wave force coefficient physical experiments
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Global Dynamic Responses and Progressive Failure of Submerged Floating Tunnel Under Cable Breakage Conditions
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作者 ZHOU Xiang-bo QIAO Dong-sheng +3 位作者 WANG Ming TANG Guo-qiang LU Lin OU Jinping 《China Ocean Engineering》 SCIE EI CSCD 2024年第4期676-688,共13页
The Submerged Floating Tunnel(SFT)relies on a tensioned mooring system for precise positioning.The sudden breakage of a single cable can trigger an immediate alteration in the constraint conditions of the tube,inducin... The Submerged Floating Tunnel(SFT)relies on a tensioned mooring system for precise positioning.The sudden breakage of a single cable can trigger an immediate alteration in the constraint conditions of the tube,inducing a transient heave response within the structure along with a transient increase in cable tension experienced by adjacent cables.In more severe cases,this may even lead to a progressive failure culminating in the global destruction of the SFT.This study used ANSYS/AQWA to establish a numerical model of the entire length SFT for the hydrodynamic response analysis,and conducted a coupled calculation of the dynamic responses of the SFT-mooring line model based on Orca Flex to study the global dynamic responses of the SFT at the moment of cable breakage and the redistribution of cable internal forces.The most unfavorable position for SFT cable breakage was identified,the influence mechanism of cable breakage at different positions on the global dynamic response was revealed,and the progressive chain failure pattern caused by localized cable breakage are also clarified. 展开更多
关键词 submerged floating tunnel cable breakage global dynamic responses progressive failure
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Non-Linear Response of Tethers Subjected to Parametric Excitation in Submerged Floating Tunnels 被引量:14
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作者 孙胜男 陈健云 李静 《China Ocean Engineering》 SCIE EI 2009年第1期167-174,共8页
For the study of the non-linear response of inclined tethers subjected to parametric excitation in submerged floating tunnels, a theoretical model for coupled tube-tether vibration is developed. Upon the assumption th... For the study of the non-linear response of inclined tethers subjected to parametric excitation in submerged floating tunnels, a theoretical model for coupled tube-tether vibration is developed. Upon the assumption that the static equilibri- um position of the tether is a quadratic parabola, the governing differential equations of the tether motion are derived by use of the Hamihon principle. An approximate numerical solution is obtained by use of Galerkin method and Runge-kutta method. The results show that, when the static equilibrium position of the tether is assumed to be. a quadratic parabola, the tether sag effect on its vibration may be reflected; the tether sag results in the asymmetry of tether vibration amplitude ; for the reduction of the tether amplitude, the buoyant unit weight of the tether should approach to zero as far as possible during the design. 展开更多
关键词 submerged floating tunnel TETHER parametric excitation quadratic parabola SAG
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Feasibility study on buoyancy-weight ratios of a submerged floating tunnel prototype subjected to hydrodynamic loads 被引量:7
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作者 Xu Long Fei Ge Youshi Hong 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2015年第5期750-761,共12页
The research progress of a novel traffic solution,a submerged floating tunnel(SFT),is reviewed in terms of a study approach and loading scenario.Among existing publications,the buoyancy-weight ratio(BWR) is usuall... The research progress of a novel traffic solution,a submerged floating tunnel(SFT),is reviewed in terms of a study approach and loading scenario.Among existing publications,the buoyancy-weight ratio(BWR) is usually predefined.However,BWR is a critical structural parameter that tremendously affects the dynamic behaviour of not only the tunnel tube itself but also the cable system.In the context of a SFT prototype(SFTP) project in Qiandao Lake(Zhejiang Province,China),the importance of BWR is illustrated by finite element analysis and subsequently,an optimized BWR is proposed within a reasonable range in the present study.In the numerical model,structural damping is identified to be of importance.Rayleigh damping and the corresponding Rayleigh coefficients are attained through a sensitivity study,which shows that the adopted damping ratios are fairly suitable for SFTP.Lastly,the human sense of security is considered by quantifying the comfort index,which helps further optimize BWR in the SFTP structural parameter design. 展开更多
关键词 submerged floating tunnel Buoyancy-weight ratio Water wave and current loads Dynamic response Human security sense Comfort index
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Parametric Vibration of Submerged Floating Tunnel Tether Under Random Excitation 被引量:6
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作者 孙胜男 苏志彬 《China Ocean Engineering》 SCIE EI 2011年第2期349-356,共8页
For the study of the parametric vibration response of submerged floating tunnel tether under random excitation, a nonlinear random parametric vibration equation of coupled tether and tube of submerged floating tunnel ... For the study of the parametric vibration response of submerged floating tunnel tether under random excitation, a nonlinear random parametric vibration equation of coupled tether and tube of submerged floating tunnel is set up. Subsequently, vibration response of tether in the tether-tube system is analyzed by Monte Carlo method. It may be concluded that when the tube is subjected to zero-mean Gaussian white noise random excitation, the displacement and velocity root mean square responses of tether reach the peak if the circular frequency of tube doubles that of tether; the displacement and velocity root mean square responses of tether increase as the random excitation root mean square increases; owing to the damping force of water, the displacement and velocity root mean square responses of tether decrease rapidly compared with tether in air; increasing the damping of the tether or tube reduces the displacement and velocity root mean square responses of tether; the large-amplitude vibration of tether may be avoided by locating dampers on the tether or tube. 展开更多
关键词 ocean engineering submerged floating tunnel TETHER parametric vibration random excitation
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Effects of fundamental structure parameters on dynamic responses of submerged floating tunnel under hydrodynamic loads 被引量:9
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作者 Xu Long Fei Ge Lei Wang Youshi Hong State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2009年第3期335-344,共10页
This paper investigates the effects of structure parameters on dynamic responses of submerged floating tunnel (SFT) under hydrodynamic loads. The structure parameters includes buoyancy-weight ratio (BWR), stiffnes... This paper investigates the effects of structure parameters on dynamic responses of submerged floating tunnel (SFT) under hydrodynamic loads. The structure parameters includes buoyancy-weight ratio (BWR), stiffness coefficients of the cable systems, tunnel net buoyancy and tunnel length. First, the importance of structural damp in relation to the dynamic responses of SPT is demonstrated and the mechanism of structural damp effect is discussed. Thereafter, the fundamental structure parameters are investigated through the analysis of SFT dynamic responses under hydrodynamic loads. The results indicate that the BWR of SFT is a key structure parameter. When BWR is 1.2, there is a remarkable trend change in the vertical dynamic response of SFT under hydrodynamic loads. The results also indicate that the ratio of the tunnel net buoyancy to the cable stiffness coefficient is not a characteristic factor affecting the dynamic responses of SFT under hydrodynamic loads. 展开更多
关键词 submerged floating tunnel Structural dampBuoyancy-weight ratio Cable stiffness coefficient tunnel net buoyancy - Hydrodynamic load
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Parametric Vibration Analysis of Submerged Floating Tunnel Tension Legs 被引量:7
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作者 SUN Sheng-nan SU Zhi-bin +1 位作者 FENG Yun-fen XU Xian-yi 《China Ocean Engineering》 SCIE EI CSCD 2020年第1期131-136,共6页
According to the characteristics of submerged floating tunnel anchored by tension legs,simplifying the tube as point mass and assuming that the tension leg is a nonlinear beam model hinged at both ends,the nonlinear v... According to the characteristics of submerged floating tunnel anchored by tension legs,simplifying the tube as point mass and assuming that the tension leg is a nonlinear beam model hinged at both ends,the nonlinear vibration equation of the tension leg is derived.The equation is solved by the Galerkin method and Runge Kutta method.Subsequently,numerical analysis of typical submerged floating tunnel tension leg is carried out.It is shown that,the parametric vibration response of the submerged floating tunnel tension leg is related to the amplitude and frequency of the end excitation.Without considering axial resonance and transverse resonance,it is reasonable that higher order modes are abandoned and only the first three modes are considered.The axial resonance amplitude of the second or third order mode is equivalent to the first order mode axial resonance amplitude,which should not be ignored. 展开更多
关键词 submerged floating tunnel tension leg parametric vibration numerical analysis
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Seismic Response of Submerged Floating Tunnel Tether 被引量:5
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作者 苏志彬 孙胜男 《China Ocean Engineering》 SCIE EI CSCD 2013年第1期43-50,共8页
A mathematical equation for vibration of submerged floating tunnel tether under the effects of earthquake and parametric excitation is presented. Multi-step Galerkin method is used to simplify this equation and the fo... A mathematical equation for vibration of submerged floating tunnel tether under the effects of earthquake and parametric excitation is presented. Multi-step Galerkin method is used to simplify this equation and the fourth-order Runge-Kuta integration method is used for numerical analysis. Finally, vibration response of submerged floating tunnel tether subjected to earthquake and parametric excitation is analyzed in a few numerical examples. The results show that the vibration response of tether varies with the seismic wave type; the steady maximum mid-span displacement of tether subjected to seismic wave keeps constant when parametric resonance takes place; the transient maximum mid-span displacement of tether is related to the peak value of input seismic wave acceleration. 展开更多
关键词 submerged floating tunnel seismic response Runge-Kuta integration method TETHER parametric excitation
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The Effect of Key Design Parameters on the Global Performance of Submerged Floating Tunnel under Target Wave and Earthquake Excitations 被引量:3
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作者 Chungkuk Jin MooHyun Kim 《Computer Modeling in Engineering & Sciences》 SCIE EI 2021年第7期315-337,共23页
This study presents a practical design strategy for a large-size Submerged Floating Tunnel(SFT)under different target environments through global-performance simulations.A coupled time-domain simulation model for SFT ... This study presents a practical design strategy for a large-size Submerged Floating Tunnel(SFT)under different target environments through global-performance simulations.A coupled time-domain simulation model for SFT is established to check hydro-elastic behaviors under the design random wave and earthquake excitations.The tunnel and mooring lines are modeled with a finite-element line model based on a series of lumped masses connected by axial,bending,and torsional springs,and thus the dynamic/structural deformability of the entire SFT is fully considered.The dummy-connection-mass method and constraint boundary conditions are employed to connect the tunnel and mooring lines in a convenient manner.Wave-and earthquake-induced hydrodynamic forces are evaluated by the Morison equation at instantaneous node positions.Several wave and earthquake conditions are selected to evaluate its global performance and sensitivity at different system parameters.Different BuoyancyWeight Ratios(BWRs),submergence depths,and tunnel lengths(and mooring intervals)are chosen to establish a design strategy for reducing the maximum mooring tension.Both static and dynamic tensions are critical to find an acceptable design depending on the given target environmental condition.BWR plays a crucial role in preventing snap loading,and the corresponding static tension is a primary factor if the environmental condition is mild.The tunnel length can significantly be extended by reducing BWR when environmental force is not that substantial.Dynamic tension becomes important in harsh environmental conditions,for which high BWR and short mooring interval are required.It is underscored that the wet natural frequencies with mooring are located away from the spectral peaks of design waves or earthquakes. 展开更多
关键词 submerged floating tunnel BWR submergence depth tunnel length mooring interval wave EARTHQUAKE mooring tension snap loading
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Experimental and numerical analysis of submerged floating tunnel 被引量:2
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作者 陈健云 李静 +1 位作者 孙胜男 苏志斌 《Journal of Central South University》 SCIE EI CAS 2012年第10期2949-2957,共9页
As a new type of structure which has never been built, submerged floating tunnel was studied mainly by numerical simulations. To further study the seismic response of a submerged floating tunnel, the first model exper... As a new type of structure which has never been built, submerged floating tunnel was studied mainly by numerical simulations. To further study the seismic response of a submerged floating tunnel, the first model experiment of submerged floating tunnel (SFT) under the earthquake was carried out on the unique underwater shaking table in China. The experimental results show that vertical excitation induces larger response than horizontal and different inclination degrees of the tether also cause different seismic responses. Subsequently, based on the fluid-structure interaction theory, the corresponding numerical model is established. And comparing the numerical results with the experimental results, those of shaking table test. Numerical model adopted is effective for it is shown that the numerical results are basically identical with dynamic response of SFT. 展开更多
关键词 submerged floating tunnel seismic response dynamic response shaking table test numerical simulation
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Research on the Dynamic Response of Submerged Floating Tunnels to Wave Currents and Traffic Load 被引量:1
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作者 Bolin Jiang Shanshan Wu +1 位作者 Min Ji Bo Liang 《Fluid Dynamics & Materials Processing》 EI 2023年第1期159-173,共15页
Submerged floating tunnel(SFTs)are typically subjected to complex external environmental and internal loads such as wave currents and traffic load.In this study,this problem is investigated through a finite element me... Submerged floating tunnel(SFTs)are typically subjected to complex external environmental and internal loads such as wave currents and traffic load.In this study,this problem is investigated through a finite element method able to account for fluid-structure interaction.The obtained results show that increasing the number of vehicles per unit length enhances the transverse vibrational displacements of the SFT cross sections.Under ultimate traffic load condition,one-way and two-way syntropic distributions can promote the dynamic responses of SFTs whereas two-way reverse distributions have the opposite effect. 展开更多
关键词 submerged floating tunnel vehicle load dynamic response wave and current loads fluid-structure interaction
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Comparison Study and Forensic Analysis between Experiment and Coupled Dynamics Simulation for Submerged Floating Tunnel Segment with Free Ends under Wave Excitations
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作者 Woo Chul Chung Chungkuk Jin +1 位作者 Moo Hyun Kim Ju-young Hwang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第10期155-174,共20页
This paper presents dynamic-behavior comparisons and related forensic analyses of a submerged floating tunnel(SFT)between numerical simulation and physical experiment under regular and irregular waves.The experiments ... This paper presents dynamic-behavior comparisons and related forensic analyses of a submerged floating tunnel(SFT)between numerical simulation and physical experiment under regular and irregular waves.The experiments are conducted in the 3Dwave tank with 1:33.3 scale,and the corresponding coupled time-domain simulation tool is devised for comparison.The entire SFT systemconsists of a long concrete tunnel and 12 tubular aluminummooring lines.Two numerical simulation models,the Cummins equation with 3D potential theory including second-order wave-body interaction effects and the much simpler Morison-equation-based formula with the lumped-massbased line model,are designed and compared.Forensic analyses for mooring-line adjustments in the simulation are carried out in view of the best representation of the physical system.After that,the measured pre-tension distribution and systemstiffness of twelvemooring lines arewell reproduced in the numericalmodel.Subsequently,the dynamic responses and mooring tensions of the SFT are compared under regular and irregular waves.The measured and simulated results coincide reasonably well for both regular-and irregular-wave conditions. 展开更多
关键词 submerged floating tunnel comparative study forensic analysis mooring-line modeling dynamic response mooring tension
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Dynamic equations for curved submerged floating tunnel
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作者 董满生 葛斐 +1 位作者 张双寅 洪友士 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第10期1299-1308,共10页
In virtue of reference Cartesian coordinates, geometrical relations of spatial curved structure are presented in orthogonal curvilinear coordinates. Dynamic equations for helical girder are derived by Hamilton princip... In virtue of reference Cartesian coordinates, geometrical relations of spatial curved structure are presented in orthogonal curvilinear coordinates. Dynamic equations for helical girder are derived by Hamilton principle. These equations indicate that four generalized displacements are coupled with each other. When spatial structure degenerates into planar curvilinear structure, two generalized displacements in two perpendicular planes are coupled with each other. Dynamic equations for arbitrary curvilinear structure may be obtained by the method used in this paper. 展开更多
关键词 submerged floating tunnel (SFT) dynamic equations Hamilton principle curved girder
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EFFECT OF ESCAPE DEVICE FOR SUBMERGED FLOATING TUNNEL (SFT) ON HYDRODYNAMIC LOADS APPLIED TO SFT 被引量:6
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作者 DONG Man-sheng MIAO Guo-ping +3 位作者 YONG Long-chang NIU Zhong-rong PANG Huan-ping HOU Chao-qun 《Journal of Hydrodynamics》 SCIE EI CSCD 2012年第4期609-616,共8页
This paper presents a potential approach to settle the problem of surviving major safety accidents in Submerged Floating Tunnel (SFT) that detachable emergency escape devices are set up outside SFT. The Computationa... This paper presents a potential approach to settle the problem of surviving major safety accidents in Submerged Floating Tunnel (SFT) that detachable emergency escape devices are set up outside SFT. The Computational Fluid Dynamics (CFD) technology is used to investigate the effect of emergency escape devices on the hydrodynamic load acting on SFT in uniform and oscillatory flows and water waves by numerical test. The governing equations, i.e., the Reynolds-Averaged Navier-Stokes (RANS) equations and k - ε standard turbulence equations, are solved by the Finite Volume Method (FVM). Analytic solutions for the Airy wave are applied to set boundary conditions to generate water wave. The VOF method is used to trace the free surface. In uniform flow, hydrodynamic loads, applied to SFT with emergency escape device, reduce obviously. But, in oscillatory flow, it has little influence on hydrodynamic loads acting on SFT. Horizontal and vertical wave loads of SFT magnify to some extend due to emergency escape devices so that the influence of emergency escape devices on hydrodynamic loads of SFT should be taken into consideration when designed. 展开更多
关键词 submerged floating tunnel (SFT) conceptual design FLOW Airy wave escape device hydrodynamic load
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Dynamic performance of submerged floating tunnel with different mooring styles subjected to anchor cable failure 被引量:1
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作者 Zhiwen WU Chuhan ZHANG +2 位作者 Liwang MOU Guoxiong MEI Ankit GARG 《Frontiers of Structural and Civil Engineering》 SCIE EI CSCD 2023年第10期1443-1464,共22页
Submerged floating tunnels(SFTs)are novel structures for transportation across long-and deep-strait regions.Owing to severe wave and current excitation as well as the effects of underwater structures and corrosion,the... Submerged floating tunnels(SFTs)are novel structures for transportation across long-and deep-strait regions.Owing to severe wave and current excitation as well as the effects of underwater structures and corrosion,the risk of local anchor cable failure is high,which can result in the progressive failure of the entire structure.In this study,experimental and numerical investigations are conducted to analyze the dynamic behavior of an SFT with different mooring styles under local cable failure.A custom-designed cable failure device and the birth-and-death element method are used to simulate cable failure(i.e.,progressive failure)via experiments and numerical simulation,respectively.A physical-scale segmental model of an SFT with different mooring styles under anchor cable failure is developed in this study.A segmental and entire-length mathematical model is developed using the ANSYS program to perform the numerical simulation.The results of the segmental numerical and experimental models indicate good agreement.The dynamic response of an SFT with different mooring styles under cable failure is comprehensively investigated by investigating the effects of key parameters(wave period,buoyant weight ratio,and cable failure mechanism).Moreover,the progressive failure of the SFT under cable failure is investigated via a segment model test and a numerical simulation of its entire length.The present study can serve as a reference for the safer designs of the SFT mooring style. 展开更多
关键词 dynamic behaviors submerged floating tunnel cable failure mooring style progressive failure
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