Meshless Numerical Simulation Algorithm For Seismic Response Of Deep Water Bridge Piers

The purpose of this paper is to apply a new method of calculation,meshless method to dynamic response analysis of bridge piers in deep water,to explore the feasibility of this method and to establish a rough framework of calculation method.In the analysis of seismic response of deep water bridges,the most widely used method is the finite element method,but the traditional finite element method has some disadvantages when dealing with the problem of fluid solid coupling and the large displacement and deformation.Finite element method is based on grid element analysis.When large displacement deformation occurs,grid distortion is easy to occur at the fluid solid boundary.Therefore,continuous grid reconfiguration is needed,which will lead to a serious decrease in computational efficiency.The meshless method used in this paper is a kind of analysis by dividing the nodes,which fundamentally avoids the problem of grid reconfiguration and easily analyzes the complex three-dimensional structure.This method has many advantages compared with the finite element method.By analyzing the characteristics of fluid solid coupling problems,the application fields of various meshless methods and methods are discussed.In this paper,the meshless method of compactly supported radial basis function(RBF)is chosen as the calculation method.The flow of the classical square cavity flow is analyzed with the general form of differential equations of motion in fluid mechanics.The control equation is discrete in time and space,and the flow form of the internal fluid in the square cavity flow is solved.Then the formula is programmed and calculated by MATLAB.Through the comparison of the data of different points and the radius of the supportin g domain,it can be concluded that the calculation method in this paper can better fit the flow situation of square cavity flow,and proves the feasibility of the method in the field of fluid.On the basis of better simulation of the internal flow of squar e cavity flow,the bridge pier model driven by earthquake is added to the internal flow,and the dynamic equations of the structure are combined to relate the seismic situation of the square cavity to the pier,and the various mechanical properties of the deep water bridge pier under the action of ground motion are calculated by programming.The final results show that in the case of fewer nodes,the results can be simulated,and it is proved that the method has a lot of research space,but it still needs t o be further studied and perfected to give full play to the advantages of the meshless method.