Dynamic Response of Submerged Floating Tunnel in the Flow Field

With the rapid growth of economy and the continuous improvement of the society, the problem of the crossing channel becomes more and more difficult to be solved. As a new type of transportation facilities, submerged floating tunnel (SFT) has many advantages in environmental damage, strong adaptability and so on. The structures of SFT mainly include the main body and the supporting system balancing weight and buoyancy. Due to the complexity of water load, the safety and stability of SFT is very important. Therefore, in the preliminary design stage, the response of SFT to the environmental load is the key point of the study. In this paper, vortex induced vibration response of cable under the action of current and parametric vibration response of pipe section are mainly studied. First of all, the partial differential equations of the cable vibration is derived, and the influence of main pipe section is simplified as parameter excitation. Then the tunnel-cable coupling model is considered to obtain a more realistic response. The cable of SFT is considered as a simply supported beam. By using the vortex induced vibration equation of the cable, the response of the cable is analyzed. The influence of parameter excitation is discussed, and the difference between the coupling and non- coupling of the tunnel and the cable is discussed.