scholarly journals Design of Immersed Tunnel and How We Research Submerged Floating Tunnel

2020 ◽  
Author(s):  
Wei Lin ◽  
Ming Lin ◽  
Haiqing Yin ◽  
Xiaodong Liu
Keyword(s):  
Immersed Tunnel ◽  
Submerged Floating Tunnel

scholarly journals Dynamic Characteristics of submerged floating tunnel under irregular waves

2019 ◽  
pp. 121-129
Keyword(s):  
Dynamic Characteristics ◽  
Transfer Functions ◽  
Response Spectrum ◽  
Time History ◽  
Point Of View ◽  
Irregular Waves ◽  
Classical Solutions ◽  
3D Fem ◽  
Immersed Tunnel ◽  
Submerged Floating Tunnel

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.

ASSESSMENT OF SEISMIC PERFORMANCE OF SUBMERGED FLOATING TUNNEL UNDER MULTI-SUPPORT SEISMIC EXCITATIONS

2019 ◽  
Vol 3 (Special Issue on First SACEE'19) ◽  
pp. 217-224
Author(s):  
Naik Muhammad ◽  
Saeed Ullah Jan Mandokhai ◽  
Zafar Baloch ◽  
Muhammad Habib ◽  
Shamsher Sadiq
Keyword(s):  
Ground Motions ◽  
Seismic Excitations ◽  
Long Span ◽  
Immersed Tunnel ◽  
Fluid Environment ◽  
Submerged Floating Tunnel ◽  
The Time Domain ◽  
Seismic Forces ◽  
Flexible Cables ◽  
Economical Alternative

Submerged floating tunnel (SFT) is an innovative structural solution for the transportation infrastructure through sea straits, fjords, and inland waters and is an economical alternative to the long-span cable-supported bridge, immersed tunnel, or underground tunnel. An SFT is a massive cylindrical structure that floats at a certain depth below the water surface and subjected to extreme environmental conditions, such as waves, tsunamis and earthquakes. The seismic assessment of SFT supported by mooring cables, under multi-support seismic excitations needs to be evaluated in more detail. The time domain dynamic problem of SFT moored by inclined mooring cables/anchors is formulated and the geometric non-linear dynamic analysis of SFT subjected to hydrodynamic and seismic excitations is performed in this paper. The prototype of SFT to be constructed in Qindao Lake of China is analysed under multi-support seismic excitations. It was found that due to the fluid environment and flexible cables the effective seismic forces are dissipated well and SFT is stable under the spectrum compatible ground motions. However, the lateral component of seismic excitations produce larger responses compared to longitudinal one and may be critical for other case studies.

Analisa Bending Stress Pada Submerged Floating Tunnel

2019 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Ahmad Syafiul Mujahid ◽  
Wibowo Harso Nugroho
Keyword(s):  
Structural Analysis ◽  
Bending Stress ◽  
Submerged Floating Tunnel

Perhitungan dengan pemodelan Submerged Floating Tunnel (SFT) dengan menggunakan perangkat lunak berbasis metode elemen hingga. Analisa struktur terowongan apung menggunakan prinsip kerja dengan mendiskripsikan seluruh beban (force) pada SFT berupa beban internal dan eksternal yang bekerja akan diperoleh momen reaksi yang terjadi sepanjang badan SFT, dengan mengetahui luas penampang melintang SFT maka dapat diperoleh bending stress di seluruh badan SFT.Keywords : submerged floating tunnel (SFT), bending stress, structural analysis

Numerical modeling of the interaction between submerged floating tunnel and surface waves

2021 ◽  
Vol 220 ◽  
pp. 108494
Author(s):  
Xuebin Chen ◽  
Qin Chen ◽  
Zhiwu Chen ◽  
Shuqun Cai ◽  
Xianrong Zhuo ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Surface Waves ◽  
Submerged Floating Tunnel

A large-scale fire test of an immersed tunnel under the protection of fire resistive coating

2021 ◽  
Vol 111 ◽  
pp. 103844
Author(s):  
Jintao Duan ◽  
Yuli Dong ◽  
Jianzhuang Xiao ◽  
Dashan Zhang ◽  
Wei Zheng ◽  
...  
Keyword(s):  
Large Scale ◽  
Fire Test ◽  
Immersed Tunnel ◽  
Resistive Coating

scholarly journals EIA FOR THE FEHMARNBELT CROSSING – THE WORLD’S LONGEST IMMERSED TUNNEL

2014 ◽  
Vol 1 (34) ◽  
pp. 47 ◽  
Author(s):  
Ida Brøker ◽  
Ian Sehested Hansen ◽  
Anne Lise Middelboe
Keyword(s):  
Immersed Tunnel
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