Assessment of the Dynamic Behaviors of Submerged Floating Tunnel Under a High-Speed Train Loading

Muhammad, Naik

doi:10.19080/ofoaj.2019.10.555784

“…Other parameters are those described in [16,17]. The mooring cables were modeled by the procedure described in [16,18,19]. The boundary conditions and limitations are similar to those described by [16].…”

Section: Equations Of Motionmentioning

confidence: 99%

Dynamic Characteristics of submerged floating tunnel under irregular waves

Muhammad

¹

,

Mandokhail

²

,

Habib

³

et al. 2019

Journal of Applied and Emerging Sciences

Self Cite

0

View full text Add to dashboard Cite

submerged floating tunnel (SFT) is an innovative structural solution for waterway crossings and is based on the idea of Archimedes Buoyancy. The main structure is kept at a certain depth underwater and is placed in position by anchor/mooring cables. SFT becomes a more economical alternative for waterways compared to classical solutions such as cable-supported bridge, immersed tunnel or underground tunnel when the width and depth of the waterway are large enough. As SFT is completely submerged in water and is subjected to extreme environmental conditions such as waves, earthquakes, and hurricanes, therefore, the evaluation the dynamic characteristics of an SFT under irregular waves is a key demand from the design point of view. In this study, the responses of an SFT that is to be built in Qindao Lake of China are investigated under irregular waves. A 3D FEM model for SFT was established, the tunnel was modeled by 3D beam elements and cables were modeled by elastic catenary elements. The irregular waves were modeled by JONSWAP spectrum. The time history analysis was performed under irregular waves and currents. The time-domain simulations were transformed to the frequency domain by Fast Fourier Transform (FFT). The spectra were smoothed using Savitzky-Golay smoothing filters. The transfer functions of SFT horizontal and vertical displacements; and cable tensions were obtained for 30 realizations. Two major peaks have been observed in each transfer function (response spectrum). One of the peaks was associated with the peak wave frequency; the second peak was associated with the translational natural frequency of the SFT.

show abstract

Modern approaches to research and development of underwater floating constructions

Poliakov,

Khorev,

Demidov

2022

Russian journal of transport engineering

2

0

View full text Add to dashboard Cite

New transport facilities such as floating underwater tunnels present a major scientific challenge. No such structure has been built all over the world; design, at best, ends at the technical and economic assessment stage. The scientific basis development for designing these structures began in the 1990s, mainly in Norway, Japan, Italy, and South Korea. A submerged floating tunnel is a structure, also known as the «Archimedes Bridge», in terms of design is an underwater artificial structure attached to pontoons on the surface of the water (zero buoyancy structure) or secured from emersion by anchor devices (positive buoyancy structure). The lack of any construction experience makes the synthesis problem of optimal solutions very relevant. There are many approaches to the underwater floating tunnel calculation and a certain paradigm for their study has not been established. For Russia, the use of floating tunnels is relevant in connection with the construction of the northern latitudinal passage and the crossing of large Siberian rivers near the coast of the Arctic Ocean. Significant deep-water obstacles are the Caspian Sea, Baikal, reservoirs of Siberian rivers, and sea straits. The review article discusses the foreign experience of scientific design basics development of such tunnels and provides a structure classification based on draft designs. Foreign publications devoted to various research and development aspects of underwater floating tunnels are considered. The problems solved in current works devoted to the study of floating tunnels can be conditionally divided into three groups. The first group of tasks concerns the justification of the use of the structure in the organization of intersections, the second group of tasks concerns the floating tunnels design calculation for various effects and their combinations, and the third group of tasks combines two related areas: the search for new methods for calculating and optimizing structures.

show abstract

Dynamic Characteristics of submerged floating tunnel under irregular waves

2019

JAES

0

View full text Add to dashboard Cite

submerged floating tunnel (SFT) is an innovative structural solution for waterway crossings and is based on the idea of Archimedes Buoyancy. The main structure is kept at a certain depth underwater and is placed in position by anchor/mooring cables. SFT becomes a more economical alternative for waterways compared to classical solutions such as cable-supported bridge, immersed tunnel or underground tunnel when the width and depth of the waterway are large enough. As SFT is completely submerged in water and is subjected to extreme environmental conditions such as waves, earthquakes, and hurricanes, therefore, the evaluation the dynamic characteristics of an SFT under irregular waves is a key demand from the design point of view. In this study, the responses of an SFT that is to be built in Qindao Lake of China are investigated under irregular waves. A 3D FEM model for SFT was established, the tunnel was modeled by 3D beam elements and cables were modeled by elastic catenary elements. The irregular waves were modeled by JONSWAP spectrum. The time history analysis was performed under irregular waves and currents. The time-domain simulations were transformed to the frequency domain by Fast Fourier Transform (FFT). The spectra were smoothed using Savitzky-Golay smoothing filters. The transfer functions of SFT horizontal and vertical displacements; and cable tensions were obtained for 30 realizations. Two major peaks have been observed in each transfer function (response spectrum). One of the peaks was associated with the peak wave frequency; the second peak was associated with the translational natural frequency of the SFT.

show abstract

Assessment of the Dynamic Behaviors of Submerged Floating Tunnel Under a High-Speed Train Loading

Cited by 3 publications

References 25 publications

Dynamic Characteristics of submerged floating tunnel under irregular waves

Dynamic Characteristics of submerged floating tunnel under irregular waves

Modern approaches to research and development of underwater floating constructions

Dynamic Characteristics of submerged floating tunnel under irregular waves

Contact Info

Product

Resources

About