Analysis of wave force induced dynamic response of submerged floating tunnel

TLDR: In this paper, the authors developed a dynamic analysis program for SFT and investigated dynamic response characteristics of SFT subjected to external environmental wave load, where the structure is modeled with 3-dimensional beam element and the fluid is assumed incompressible, invicid and irrotational and is analyzed by boundary element method applying linear potential theory.

Abstract: Submerged Floating Tunnel (SFT) is a new structural concept for crossing water. The purpose of the present study is to develop a dynamic analysis program for SFT and investigate dynamic response characteristics of SFT subjected to external environmental wave load. The structure is modeled with 3-dimensional beam element and the fluid is assumed incompressible, invicid and irrotational and is analysed by boundary element method applying linear potential theory. Using the hydrodynamic coefficients of added mass, radiation damping and wave excitation force obtained by solving 2-dimensional diffraction problem, 3-dimensional structural analysis of SFT is performed in time domain and results are presented. The depth effect of SFT location on the hydrodynamic coefficients are illustrated as well as the effect of the frequency dependency of the coefficients which is taken into account in the analysis program.