Session: 06-03-01 Fluid-Structure, Multi-body and Wave-body Interaction/Professor Calisal Honoring Symposium

Submission Number: 156598

Research on Dynamic Response Analysis and Tmd Control of Moored Floating Bridge Under Wave Load 

In this paper, a numerical study is presented to investigate the dynamic response and TMD control of a side-anchored straight 4.6 km long fjord crossing floating bridge subjected to wave loads. The bridge is supported by 35 pontoons, and four groups of deep water mooring lines are employed to increase its transverse stiffness and limit the lateral movement of the floating bridge. First, the wave force of pontoons was researched, including the wave-induced forces and hydrodynamic coefficients under the action of regular wave of different frequencies. The effects of wave parameters, such as wave height, wave period, and incident angle on these forces was also investigated. Subsequently, to analyze the dynamic response of the floating bridge, a full-scale dynamic analysis model under different wave load combinations conditions was established. In this section, we discussed the challenges involved in numerical modeling of the moored floating bridge, mainly including radiation forces and simulation of mooring systems. To address these difficulties, different approaches were tried to simulate the behavior of mooring lines as well as the added mass and radiation damping caused by radiation problems. And the proposed numerical modeling method was validated through comparison with other numerical studies of this side-anchored fjord-crossing floating bridge. Finally, in order to improve driving comfort, a TMD control method for long flexible floating bridges was proposed based on the dynamic model. The results show that incorporating structural modes into the control strategy significantly improves the effectiveness of the TMD system. On this basis, TMD parameters were optimized for extreme sea states (100-year wave conditions), with a detailed analysis of the effects of mass ratio and damping ratio. The study ultimately determined the optimal TMD parameters.

Presenting Author: Chenchen Zhou Harbin Institute of Technology

Presenting Author Biography: PhD candidate at Harbin Institute of Technology