Seismic response of submerged floating tunnel under support excitation

Mirzapour, Jamil; Shahmardani, Mahdieh; Tariverdilo, S.

doi:10.1080/17445302.2016.1171591

Cited by 21 publications

(6 citation statements)

References 17 publications

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“…Here, subscript j denotes the j th mode. Tese simplifed displacement mode shapes have been commonly used to analyze the dynamic responses of an SFT under seismic, vehicle, and impact loadings [30][31][32].…”

Section: Derivation Of Strain-displacementmentioning

confidence: 99%

Simultaneous Estimation of Submerged Floating Tunnel Displacement and Mooring Cable Tension through FIR Filter-Based Strain and Acceleration Fusion

Choi

Jang

et al. 2023

Structural Control and Health Monitoring

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A submerged floating tunnel (SFT) is a tunnel structure that floats approximately 50 m below the water surface and is anchored to the seabed by mooring cables. It is a new alternative to conventional bridges and immersed tunnels. There have been ongoing efforts to construct SFTs worldwide, and the integrity of these SFTs needs to be monitored throughout their lifespan. This study simultaneously estimated the tunnel displacement and mooring cable tension force using acceleration and strain measurements to assess the integrity of an SFT. First, strain measurements were transformed to displacement using simplified mode shapes and mode-scaling factors, which did not require the true mode shapes of the SFT. The mode-scaling factors were automatically estimated using initial strain and acceleration measurements. Then, the strain-based displacement was combined with the acceleration measurement using a finite impulse response filter to improve the displacement estimation accuracy. In addition, the tension force of a mooring cable was estimated from the displacement at the connection between the tunnel and mooring cable. The feasibility of the proposed technique was examined through a series of numerical simulations and laboratory tests on an 8 m-long aluminum SFT mock-up structure.

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Section: Derivation Of Strain-displacementmentioning

confidence: 99%

Simultaneous Estimation of Submerged Floating Tunnel Displacement and Mooring Cable Tension through FIR Filter-Based Strain and Acceleration Fusion

Choi

Jang

et al. 2023

Structural Control and Health Monitoring

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“…A more enhanced numerical procedure for the analysis of SFT considering spatial variability of seismic excitations was developed by [5]. A recent study that describes the spatial variation of ground motion excitation is carried by [6], this study also concluded that 2D and 3D fluid fields have a great impact on the magnitude of displacements of SFT along the tunnel length. Since SFT is a very large structure and the transient response analysis requires a large amount of computational space, therefore, the model order reduction is necessary for the design process of SFT.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of submerged floating tunnel under irregular waves

Muhammad

Mandokhail

Habib

et al. 2019

Journal of Applied and Emerging Sciences

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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.

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“…Besides, Wu et al (2018) took the SFT cable as research object and the parameter sensitivity study of the cable under hydrodynamic force and earthquake excitations has been carried. Akbarzadeh et al (2021) and Mirzapour et al (2017) assessed the spatial vibration and spectrum response of the SFT under asynchronous ground excitation. Actually, the excited water will exert hydrodynamic pressure on the structure under the seismic ground motion, which results in higher stress and larger deformation.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic pressures analysis of submerged floating tunnel under coaction of seismic SV wave and ocean wave

Lin

Zhao

et al. 2022

Advances in Structural Engineering

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Submerged floating tunnel (SFT) is an innovative traffic structure for crossing long waterway or deep straits. To investigate the hydrodynamic pressure acting on the SFT under coaction of seismic SV wave and ocean wave, a theoretical model is developed for considering the effect of marine sediment. According to the displacement potential functions and linear wave theory, the reflection and refraction coefficients of wave action in different media are derived. Numerical examples are illustrated to analyze the hydrodynamic pressure distribution. The results show that the hydrodynamic pressure has a spatial difference along the SFT longitudinal direction when the structure operating in the water subjects different incident phase ocean wave. Wave incidence frequency not only changes the loading action mode but also affects the amplitude of the hydrodynamic pressure. Besides, due to the ocean wave loading combined, the effect of saturation on the hydrodynamic pressure load on the structure is not obvious. And the dense arrangement of tethers is recommended to the structure construction.

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Seismic response of submerged floating tunnel under support excitation

Cited by 21 publications

References 17 publications

Simultaneous Estimation of Submerged Floating Tunnel Displacement and Mooring Cable Tension through FIR Filter-Based Strain and Acceleration Fusion

Simultaneous Estimation of Submerged Floating Tunnel Displacement and Mooring Cable Tension through FIR Filter-Based Strain and Acceleration Fusion

Dynamic Characteristics of submerged floating tunnel under irregular waves

Hydrodynamic pressures analysis of submerged floating tunnel under coaction of seismic SV wave and ocean wave

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