Soil - Structure Interaction Under The Car - Bridge System Coupled Vibration Analysis

Through second-development system of ANSYS software, a kind of dynamic wheel-track contact element based on coulomb contact algorithm was presented. This article established Three finite element Model:Vehicle-Bridge, Vehicle-Bridge-Pier, Vehicle-Bridge-Pier-pile-soil, and calculated high-speed railway bridge dynamic response of the vertical and horizontal under the three models. By considering the vertical and lateral track irregularity conditions, calculated the vehicle model, car speed, track irregularity level, lateral stiffness of pier, pile length, foundation and other parameters affect the analysis, give reference to the actual design and construction information. In this paper, complete the following tasks:1, Illustrates the purpose and significance of the research, reviewed the characteristics of high-speed railway and the bridge, summed up the domestic and foreign vehicle-Status and the dynamic interaction of soil-structure interaction.2, Established the Vehicle-Bridge-Pier-pile-soil dynamic interaction model system, By considering the vertical and lateral track irregularity conditions, established Vehicle-Bridge-Pier- pile-soil vibration equation of the system.3, Analyzed the pile-soil effects on the bridge coupling system, spatial pile-soil model is established according to the finite element method, and the influences of infinite soil on the structure is simulated by using three-dimensional viscous boundary. Pile-soil interaction analysis mode is established by soil dynamicsl.4, Through second-development system of ANSYS software, a kind of dynamic wheel-track contact element based on coulomb contact algorithm was presented. Through this method were validated in the article, considering the vertical and lateral track irregularity conditions, the bridge dynamic response characteristics were calculated and analyzed from the time domain and frequency domain.5, Analyzed the impact of different parameters on the bridge dynamic response, such as vehicle model, train speed, bridge bending stiffness, lateral stiffness of piers, pile length, foundation soil depth and track irregularity, give reference to the actual design and construction information.