Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Discrete-module-beam-based hydro-elasticity simulations for moored submerged floating tunnel under regular and random wave excitations
Highlights A computer program is developed to evaluate the hydro-elastic behaviors of a moored submerged floating tunnel (SFT). The discrete-module-beam (DMB) method based on 3D potential theory is extended to include second-order wave forces. The Morison equation gives overestimation when slender body assumption is not valid, compared with 3D potential theory. Snap loading can induce large mooring tensions and transient motions at natural frequencies. Second-order difference-frequency wave force plays a crucial role in the dynamics of a long-span SFT induced by resonance.
Abstract This study investigates the hydro-elastic behaviors of a moored submerged floating tunnel (SFT) using a fully-coupled time-domain hydro-elastic model based on the discrete-module-beam (DMB) method. In frequency domain, multibody hydrodynamic coefficients and wave excitation forces are obtained from 3D potential theory. In the time-domain DMB-based hydro-elastic model, the multibody Cummins equation and coupled stiffness matrix according to the theory of Euler-Bernoulli beam and Saint-Venant torsion are used. Mooring lines are modeled with rod theory and high-order finite-element formulations. The tunnel is then coupled with mooring lines by linear springs at respective connection locations. The present DMB model is validated through comparisons with two independent commercial programs, i.e., quasi-static computation based on the 3D solid model by ABAQUS and dynamic simulation using the semi-empirical Morison model by OrcaFlex. Then, the effects of various design parameters, such as submergence depths, buoyancy-weight ratios (BWRs), and wave conditions, on dynamic responses and mooring tensions are evaluated. The effects of nonlinear snap loadings and first- and second-order wave forces on SFT dynamics in regular and random waves are also investigated. Wet natural frequencies and mode shapes, hydro-elastic lateral and vertical displacements, mooring tensions, and bending moments for various cases are presented and analyzed.
Discrete-module-beam-based hydro-elasticity simulations for moored submerged floating tunnel under regular and random wave excitations
Highlights A computer program is developed to evaluate the hydro-elastic behaviors of a moored submerged floating tunnel (SFT). The discrete-module-beam (DMB) method based on 3D potential theory is extended to include second-order wave forces. The Morison equation gives overestimation when slender body assumption is not valid, compared with 3D potential theory. Snap loading can induce large mooring tensions and transient motions at natural frequencies. Second-order difference-frequency wave force plays a crucial role in the dynamics of a long-span SFT induced by resonance.
Abstract This study investigates the hydro-elastic behaviors of a moored submerged floating tunnel (SFT) using a fully-coupled time-domain hydro-elastic model based on the discrete-module-beam (DMB) method. In frequency domain, multibody hydrodynamic coefficients and wave excitation forces are obtained from 3D potential theory. In the time-domain DMB-based hydro-elastic model, the multibody Cummins equation and coupled stiffness matrix according to the theory of Euler-Bernoulli beam and Saint-Venant torsion are used. Mooring lines are modeled with rod theory and high-order finite-element formulations. The tunnel is then coupled with mooring lines by linear springs at respective connection locations. The present DMB model is validated through comparisons with two independent commercial programs, i.e., quasi-static computation based on the 3D solid model by ABAQUS and dynamic simulation using the semi-empirical Morison model by OrcaFlex. Then, the effects of various design parameters, such as submergence depths, buoyancy-weight ratios (BWRs), and wave conditions, on dynamic responses and mooring tensions are evaluated. The effects of nonlinear snap loadings and first- and second-order wave forces on SFT dynamics in regular and random waves are also investigated. Wet natural frequencies and mode shapes, hydro-elastic lateral and vertical displacements, mooring tensions, and bending moments for various cases are presented and analyzed.
Discrete-module-beam-based hydro-elasticity simulations for moored submerged floating tunnel under regular and random wave excitations
Jin, Chungkuk (Autor:in) / Kim, Gyu-Jin (Autor:in) / Kim, Sung-Jae (Autor:in) / Kim, MooHyun (Autor:in) / Kwak, Hyo-Gyoung (Autor:in)
Engineering Structures ; 275
25.10.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Stiffness Evaluation of Submerged Floating Foundation Moored by Four Cabes
| British Library Online Contents | 1993
Stiffness Evaluation of Submerged Floating Foundation Moored by Four Cables
| British Library Online Contents | 1994