Abstract
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. As SFT is completely submerged in water and is subjected to extreme environmental conditions, therefore, the evaluation of 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 is investigated under irregular waves. The irregular waves were modeled by the JONSWAP spectrum. The time-domain simulations were transformed to the frequency domain by Fast Fourier Transform (FFT). The spectrum was smoothed using Savitzky-Golay smoothing filters. The transfer functions of SFT horizontal and vertical displacements; and cable tensions were obtained for 30 realizations. Some useful conclusions are drawn from the numerical results of the present study.
Highlights
Submerged floating tunnel (SFT) is a massive structure and the structural behavior is greatly influenced by waves and currents
A numerical procedure for the analysis of SFT accounting for seismic excitation was developed by Fogazzi et al [1], more attention in this study was devoted to the ‘ad hoc’ finite element for modeling the behavior of anchor/mooring element accounting for geometrical nonlinearities and wave loading
A procedure for the nonlinear dynamic analysis of SFT considering 3D multi-support seismic excitations and nonlinear drag forces due to steady current and wind waves, was presented by Di Pilato et al [2], more focus in this research was to improve the finite element modeling of the anchor bars developed in the previous work
Summary
Submerged floating tunnel (SFT) is a massive structure and the structural behavior is greatly influenced by waves and currents. A numerical procedure for the analysis of SFT accounting for seismic excitation was developed by Fogazzi et al [1], more attention in this study was devoted to the ‘ad hoc’ finite element for modeling the behavior of anchor/mooring element accounting for geometrical nonlinearities and wave loading. A procedure for the nonlinear dynamic analysis of SFT considering 3D multi-support seismic excitations and nonlinear drag forces due to steady current and wind waves, was presented by Di Pilato et al [2], more focus in this research was to improve the finite element modeling of the anchor bars developed in the previous work. This work related to finite element development of anchor bars was improved and the dynamic behavior of SFT was evaluated using spatially varying seismic motion by Di Pilato et al [3]. The spectrums are filtered (smoothed) using Savitzky-Golay smoothing filters [11, 14]
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