Transient response analysis by model order reduction of a Mokpo-Jeju submerged floating tunnel under seismic excitations

Han, Jeong Sam; Won, Boreum; Park, Woo-Sun; Ko, Jin Hwan

doi:10.12989/sem.2016.57.5.921

Cited by 15 publications

(6 citation statements)

References 10 publications

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“…Considering that wave/current/wind effects are greatly reduced, the cost is almost constant along the length [5], and ship passage is not obstructed by the structure, the SFT has been regarded as a competitive alternative to floating bridges and immersed tunnels. In this regard, since Norway's first patent in 1923 [6], many proposals and case studies have been published worldwide, which includes Høgsfjord/Bjørnafjord in Norway [7][8][9], the Strait of Messina in Italy [10], Funka Bay in Japan [11,12], Qiandao Lake in China [13,14], and the Mokpo-Jeju SFT in Korea [15]. Even though there is no actually installed structure in the world despite extensive research [16], the first construction of the SFT is being considered by Norwegian Public Road Administration (NPRA) with global interest [17].…”

Section: Introductionmentioning

confidence: 99%

Time-Domain Hydro-Elastic Analysis of a SFT (Submerged Floating Tunnel) with Mooring Lines under Extreme Wave and Seismic Excitations

Jin

Kim

2018

Applied Sciences

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Global dynamic analysis of a 700-m-long SFT section considered in the South Sea of Korea is carried out for survival random wave and seismic excitations. To solve the tunnel-mooring coupled hydro-elastic responses, in-house time-domain-simulation computer program is developed. The hydro-elastic equation of motion for the tunnel and mooring is based on rod-theory-based finite element formulation with Galerkin method with fully coupled full matrix. The dummy-connection-mass method is devised to conveniently connect objects and mooring lines with linear and rotational springs. Hydrodynamic forces on a submerged floating tunnel (SFT) are evaluated by the modified Morison equation for a moving object so that the hydrodynamic forces by wave or seismic excitations can be computed at its instantaneous positions at every time step. In the case of seabed earthquake, both the dynamic effect transferred through mooring lines and the seawater-fluctuation-induced seaquake effect are considered. For validation purposes, the hydro-elastic analysis results by the developed numerical simulation code is compared with those by a commercial program, OrcaFlex, which shows excellent agreement between them. For the given design condition, extreme storm waves cause higher hydro-elastic responses and mooring tensions than those of the severe seismic case.

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Section: Introductionmentioning

confidence: 99%

Time-Domain Hydro-Elastic Analysis of a SFT (Submerged Floating Tunnel) with Mooring Lines under Extreme Wave and Seismic Excitations

Jin

Kim

2018

Applied Sciences

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“…Since then, many case studies and proposals have been made for different proposed projects, such as Hogsfjord in Norway [3], Funka Bay in Japan [4,5], Messina Strait in Italy [6,7], Qiandao Lake in China [8,9] and Mokpo-Jeju SFT in South Korea [10].…”

Section: Introductionmentioning

confidence: 99%

“…The numerical models described above focused on the dynamic response of SFT, including some recent developments [10,23,24]. However, the global performance of the SFT under complex environmental conditions is not yet well understood.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Submerged Floating Tunnel Subjected to Hydrodynamic and Seismic Excitations

2017

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Submerged floating tunnels (SFTs) are innovative structural solutions to waterway crossings, such as sea-straits, fjords and lakes. As the width and depth of straits increase, the conventional structures such as cable-supported bridges, underground tunnels or immersed tunnels become uneconomical alternatives. For the realization of SFT, the structural response under extreme environmental conditions needs to be evaluated properly. This study evaluates the displacements and internal forces of SFT under hydrodynamic and three-dimensional seismic excitations to check the global performance of an SFT in order to conclude on the optimum design. The formulations incorporate modeling of ocean waves, currents and mooring cables. The SFT responses were evaluated using three different mooring cable arrangements to determine the stability of the mooring configuration, and the most promising configuration was then used for further investigations. A comparison of static, hydrodynamic and seismic response envelope curves of the SFT is provided to determine the dominant structural response. The study produces useful conclusions regarding the structural behavior of the SFT using a three-dimensional numerical model.

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“…Since then, many case studies and proposals have been made for different proposed projects, such as Hogsfjord in Norway [2], Funka Bay in Japan [3], Messina Strait in Italy [4], Qindao Lack in China [5], and Mokpo-Jejo SFT in South Korea [6].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the SFT numerical models developed so for, consider the dynamic response of SFT subjected hydrodynamic waves and seismic loadings [5][6][7]; however, the role of mooring cable stiffness in the dynamic response of an SFT is not investigated or evaluated in more detail. The mooring cables are main structural components to provide restoring capacity to SFT.…”

Section: Introductionmentioning

confidence: 99%

The role of cable stiffness in the dynamic behaviours of submerged floating tunnel

et al. 2017

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Abstract. Submerged floating tunnel (SFT) is a new solution for the transportation infrastructure through sea straits, fjords, and inland waters and can be a good alternative to long span suspension bridges and immersed tunnels. The mooring cables/anchors are main structural components to provide restoring capacity to the SFT. The time domain dynamic problem of SFT moored by vertical and inclined mooring cables/anchors is formulated. The dynamic analysis of SFT subjected to hydrodynamic and seismic excitations is performed. As the cable stiffness determines the deformation ability of SFT, therefore it becomes crucial to evaluate the effect of mooring cable stiffness on the response of SFT. The displacements and internal forces of SFT clearly specify that the vertical/tension leg mooring cables provide very small stiffness as compared to inclined mooring cables. In order to keep the SFT displacements within an acceptable limit, the effect of cable stiffness should be properly evaluated for practical design of SFT.

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Transient response analysis by model order reduction of a Mokpo-Jeju submerged floating tunnel under seismic excitations

Cited by 15 publications

References 10 publications

Time-Domain Hydro-Elastic Analysis of a SFT (Submerged Floating Tunnel) with Mooring Lines under Extreme Wave and Seismic Excitations

Time-Domain Hydro-Elastic Analysis of a SFT (Submerged Floating Tunnel) with Mooring Lines under Extreme Wave and Seismic Excitations

Performance Evaluation of Submerged Floating Tunnel Subjected to Hydrodynamic and Seismic Excitations

The role of cable stiffness in the dynamic behaviours of submerged floating tunnel

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