Numerical Simulation And Experimental Study On The Single Tower Of Cable-stayed Bridge Under Wave Action

As the environment of the cross-sea bridge is more complex,so the load is also very complex,when design the cross-sea bridge,we must consider all loads.The basic part of the cross-sea bridge is subjected to wave and water flow action,seismic action and wind load,in addition to the bridge weight and bridge deck live load.Among them,the wave load as one of the main dynamic loads,is often considered as a control load in the design of the cross-sea bridge.So far,the traditional Morison formula is still used for the calculation of the wave force on the structure.In this paper,taking the largest-scale cross-sea cable-stayed bridge proposed to design and construction as the object,mainly study the response of the single-tower under the wave action.However,the basic part of the single tower belongs to the complex pile-cap composite structure.So far,there is no ready-made theoretical formula to use.So in this paper,the wave force of the single tower of the cable-stayed bridge is experimentally studied and simulated,and the response of the structure under the wave action is analyzed.The main contents include:(1)Summarizing several kinds of wave theory and its application range,which are commonly used in regular waves.Introducing and comparing several methods of calculating the wave force.(2)A numerical method for calculating the wave force based on CFD is proposed,the method is to simulate the wave action to the structure by fluid software FLUENT.Several common numerical methods of wave generating and wave elimination are introduced.In order to verify the accuracy of the CFD method to calculate wave force,the two wave forces on a D=2m’ pile which are calculated by the CFD method and the Morison formula are compared.(3)Based on the CFD method,using FLUENT to simulate the wave force on the group pile and cap which is the basic part of the single tower of cable-stayed bridge.By comparing the numerical simulation results with the experimental results,to verify the validity of the CFD method in simulating the interaction between the wave and the complex pile-cap composite structure.(4)Using ANSYS to model the single tower of the cable-stayed bridge,the wave forces obtained by the CFD method are applied to the structure.Carrying out static analysis and dynamic analysis of the structure under the wave action to verify the safety and stability of the single tower of the cable-stayed bridge;Comparing the results of static analysis and dynamic analysis to verify that it is necessary to carry out the dynamic analysis of the structure under the wave action.