Fluid-structure Interaction And Its Application In Bridge Engineering

Under the environment of massive construction of sea-crossing bridges in China, and aiming at final application of numerical model, a numerical model based on Lagrange method and Cartesian coordinate system, "Key Points Tracking(KPT)", is developed in this thesis to track all 2D DOFs of geometry of arbitrary structure, and further modification is also made to "Locally Relative Stationary (LRS)" method to enable fluid-structure interaction. Some key issues in Fluid-structure are discussed and some suggestions are given for solving urgent engineering issues.This thesis is consisted of four parts:First of all, researching background is introduced, and existing studies in these fields are carefully reviewed.Secondly, governing equations and algorithm of fluid are introduced and two examples are given to illustrate these equations.Thirdly, detailed explanations are given to illustrate several key issues in tracking obstacle. For example, modification made in governing equations to realize moving obstacle, methods developed to track all degree of freedom for moving body, and treatment of solid boundary. Finally, four examples are given to further explain these key issues. Among them, three are moving along given trajectory and one is strong coupled interaction.Fourthly, the application of fluid dynamics and fluid-structure is also studied. A method is proposed to predict failure of bridge beam during hurricane induced loading. Also, after investigating existing studies, several suggestions about this issue are given.