ABSTRACT
SFT is a super large floating structure with huge horizontal scale and low structural stiffness, the dynamic response of which can not be calculated according to the rigid body hypothesis. Under the framework of the Discrete-Module-Beam (DMB) method, the hydroelastic behavior of a fixed horizontal hollow tube body that is completely submerged under the action of different regular waves is investigated. In the DMB method, the floating elastic structure is divided into a sufficient number of rigid bodies connected by beam elements. These bodies are equivalent to mass nodes with mass concentrated at the center of gravity and bearing all the loads acting on the submodules. The hydroelastic response of the SFT is obtained based on the potential flow theory and the Morison equation, respectively. The results show that the two modeling methods can both accurately calculate the hydroelastic response of the underwater suspended tunnel in their applicable ranges.
