Vortex-induced vibration analysis of submerged floating tunnel tension legs

Abstract

Considering the influence of axial and transverse vibration of tension leg of submerged floating tunnel, the non-linear vibration equation of tension leg under the action of vortex-induced excitation is derived and solved numerically by Galerkin method and Runge-Kutta method. The results show that the vibration amplitude and frequency of tension leg under the action of vortex-induced excitation are related to the natural frequency of tension leg, Due to water damping, the vortex-induced vibration response of tension leg in submerged floating tunnel is lower than that of the tension leg in air; the shorter the length of tension leg is, the higher the current velocity needed to produce vortex-induced resonance is; the larger the initial tension of tension leg is, the faster the current velocity needed to generate vortex-induced resonance is; the transverse pulse force increases with the increase of initial tension and the outer diameter of tension leg, and with the length of tension leg increase and decrease.