Analysis of the dynamic response of submerged floating tunnels to wave-induced loads, incorporating joint mechanical properties

The submerged floating tunnel (SFT) is a new type of transportation structure that spans deep and long water bodies, and it has become a highly competitive form of cross -sea structure that withstands complex and diverse loads. Recent research has highlighted the pivotal role of joint mechanical properties in the dynamic response and design of SFT, simultaneously the absence of a well-defined joint design has severely hindered progress in SFT development and construction. Therefore, in this study, the dynamic wave forces calculated by the potential flow theory and static vertical force calculated by the buoyancy and weight are applied to the structure model for studying the dynamic response of SFT with mechanical properties of joint under wave-induced loads has been proposed. Reasonable suggestions are provided for designing joint based on structural safety and driving comfort requirements of SFT. It is observed that the variation in shear and torsional stiffness of the joint exerts a significant influence on deformations and driving comfort of SFT. Based on these findings, a novel joint component for SFT be designed to enhance the mechanical properties of the SFT joint. Finally, discovering that the novel joint component can provide additional comfort and safety for the structure.