Analysis Of Soil-foundation-bridge Interaction Under Oblique Incident Seismic Wave

In the earthquake, the interaction not only exists between the bridge structure and its foundations, and between the adjacent foundations will also have the existence of the interaction. It is of great significance to study and analyze the interaction mechanism and influence law of this kind of interaction. The main work of this paper is as follows:(1)This paper presents an efficient time domain direct method to analyze the dynamic interaction between the three dimensional soil-structure by using the explicit finite element method and the transmitting artificial boundary theory to simulate the soil and using the implicit time step integration method to simulate the structure. This method can consider the seismic wave to the space angle(described by two angles of incidence).(2)Using this method to simulate the soil-structure interaction response of a single-span bridge model in three different seismic wave(SH wave, P wave and SV wave) and different incident angles, analyzed the movement law of the single-span bridge under thirteen different excitation cases.As the traveling wave effect, the result shows the existence of distinct patterns of bridge response: symmetric, antisymmetric, and whipping.(3)The effect of some parameters is analyzed,such as: the types of incident wave, the incidence angle, the relative stiffness of the bridge and the soil, the mass of the foundation to the mass of the soil replaced by the foundation, the mass of the bridge girder to the mass of the soil replaced by the foundation and so on. Through a series of examples, expounds the effect of soil-bridge interaction under oblique incident seismic wave.(4)The three-dimensional model of Gaoyuan bridge is established, this example shows that the method used in this paper can calculet more complex bridge model.