Research The Impact Of Pier On Bridge's Lateral Vibration Based On Finite Element Method

Along with the speed-increasing of the train and constructions of the high-pier bridge, lateral stiffness has become an important criterion weighing the permanence and safety of the bridge, and the impact on the bridge by the pier stands out simultaneously. So it is important to study pier's vibration characteristic and the impact on the bridge by the pier.There are analytic method and numerical method, used to study pier's vibration. But just some simple equation problems can be solved by analytic method. Therefore, numerical method is used widely. And finite element method is one of effective numerical methods. By finite element software, firstly, pier's model is built, which is modified in terms of experiment results. Based on this model, pier's section shapes, upper bridge span and lower foundation part are detailed discussed, which influence the vibration characteristic of the pier. Then, a coupled 3D-vibration model used to simulate the bridge-pier-foundation is built .Based on this model, the impact on the bridge's lateral vibration by the stiffness and mass of piers are studied. And the critical range of the ratio of stiffness between beam and pier has been put forward, in which the pier's influence can be neglected and simple bridge mode can be adopted when studying the vibration of bridges.At the same time , in order to improve the confidence degree of pier's FEM model, element types, element numbers and meshing manners are analyzed. The results offer reference for pier's model parameters choosing.