Dynamic Characteristics of submerged floating tunnel under irregular waves
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.
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