The Models Based On The Finite Element Method For The Dynamic Response Of Double-tubes Submerged Floating Tunnels Under Wave Loading

Submerged Floating Tunnel(SFT)is a new structure to cross the strait and inland waters.The mechanics principle of SFT is to achieve the stress balance through the combined action of the three forces: gravity,buoyancy and anchor cable force.SFT does not affect ship navigation condition,it has little impact on the ecological environment and geographical landscape.SFT can operate around the clock and it is not affected by extreme bad weather such as fog,rain and wind.Because of these positive factors,researchers spare no effort to promote the development of SFT technology.The model based on the Finite Element Method for the dynamic response of submerged floating tunnels under wave loading is established to investigate the dynamic response of submerged floating tunnels under wave loading.The static response of SFT under gravity,buoyancy and anchor cable's pre-tension and the dynamic response under wave force and anchor cable's force in vibration are analyzed.The empirical equation known as Morison's equation is used to estimate the wave force.The design of SFT needs to consider the extreme environment,which is very wavy.Second order Stokes wave and cnoidal wave theory is used to describe the wave.The dynamic equilibrium equation is analyzed in time domain by the method of multi-degree-of-freedom step-by-step integration method to analyze the dynamic response of SFT.This paper does not use commercial software,but adopts the method of programming calculation to provide a calculation method for dynamic response analysis of SFT.In this paper,the response of double-row suspension tunnel is analyzed by a numerical example.The specific work of this paper is as follows:1.The effects of length,cross section and cable distribution on the static response of SFT are studied.It calculates the maximum displacement and maximum stress of the structure in different calculation schemes2.The effects of environmental factors such as the depth of seawater,the depth of SFT,the angle of tunnel and direction of wave propagation,wave height and wave length on the dynamic response of the structure were studied.It calculates the maximum displacement shape of SFT and the force distribution curve of each node at the time when the maximum displacement shape appears,the coordinate curve of the maximum deformation of the structure and the curve of the node force changing with time in different calculation schemes...