Research On Wave Response Of Deepwater Pier On Cross-Sea Bridge

Since the environment of underwater bridge pier structure is complicated, although the rigidity is relatively large, but in the waves, wave and current, earthquakes and hurricanes and other marine dynamic loads prone to large dynamic response, underwater bridge pier can cause structural damage or even fatigue damage in long-term effect of frequent loads, therefore, it is very important to carry out the research of the underwater pier structural by waves and currents and other marine environments loads designing of the underwater piers,even in the operation stage,the security operations,it also has practical significance.In this paper, from the bay bridge pier according to the characteristics of the particularity of environment.Firstly, based on the wave theory and wave force calculation method, the different sizes and shapes of piers wave force calculation methods were compared,then the use of validated the CDF numerical methods as well as different forms of pier waves of different parameters were calculated numerically, and conducted regular.Finally, the paper simulated the role of circular piers combined action of waves and uniform flow and analyzed the response of the piers.The main contents of the thesis are as follows:1.Thesis analyzes the research background and practical significance, based on the domestic role of waves and uniform flow related theories of the structure as well as in joint action of waves and uniform flow pier structure on the dynamic response of water related research carried out and summarized, and compared wave force with different size and shape of the piers in the second chapter.2.It proposed a pier wave force method based on CFD numerical and the analytical calculation results by using the method of numerical solutions are compared with Morison formula, and compared with experimental data in existing literature to the numerical results, in order to verify the reliability of numerical solution method.3. Using CFD software calculation method of wave force acting on a different shape and size of pier is calculated, the mesh model, a dimensional cylindrical model as an example, the computational domain grid wave force through encryption calculation, according to the calculated results to verify the grid change to affect the accuracy of the calculation results of; through numerical simulation, we can see changes of wave forces on piers and the relationship with the wave period between; and by the different shapes and different sizes model calculated results are compared and analyzed,the change law between them; the change law of two wave parameters to analysis the parameters of wave force and wave height and wave length are changes affect the range of depth of pier degree;by calculating the wave forces on different positions of the pier column, summarize the distribution of wave forces on piers on; for maximum wave force acting on the structure dynamic pier column of different models are compared and analyzed on the response.4.Even under the action of water flow on the flow around a circular cylinder and the vortex induced vibration phenomena are briefly introduced; based on standard turbulence model, are used for numerical simulation of2D and3D simulations of large cylinder, a flow in cylindrical certain depth on the flow field around the pressure distribution and velocity distribution was analyzed; the process of water under the action of cylinder wake vortex development in a cycle is described, discussed the uniform flow of water dynamic response of the pier column structure.5. In the joint action of wave and uniform flow under the comprehensive effect on the cylinder were studied, first introduced the principle and method of combined wave current action; and then flow combined effects of wave flow around a circular cylinder with flow effects were compared, in a flow rate of a depth of cylinder on the flow field around the pressure distribution and velocity distribution were compared and analyzed; finally obtained by numerical calculation combined wave current maximum wave force and wave and current respectively maximum wave force superposition value are compared, and reasons are analyzed, and dynamic response of large diameter cylinder of the obtained results.Finally, this paper summarizes the research work and raised the need for further research and the problems to be solved.