Stress Mechanism Analysis Of Pier Columns Under The Coupling Of Highway Bridges And Other Factors

With the rapid development of China's urban economy,the urban road network is also increasing and increasing,so that the construction of new roads and backfill earthwork under existing bridges is also increasing,resulting in a series of new bridge problems in the bridge.During the operation phase,the settlement deformation of the backfilled soil under the new construction of the bridge has an adverse impact on the pier.Under the action of the dynamic load on the bridge,the bridge structure is easily damaged,and there are major safety hazards.Therefore,it is of great significance to analyze the stress of the piers under the roads in the operation stage.Based on the engineering background of Chenwu Viaduct,this paper studies the force mechanism of the third joint 11?14 filling pier.In this paper,ANSYS finite element software is used to model and analyze the dynamic characteristics of the single main girder structure and the whole bridge model by establishing the full span model of the third bridge.It is found that the natural frequency of the whole bridge model is lower than that of the main girder model.The force mechanism of the pier column under the coupling action of many factors such as Road Underpass of highway bridge is analyzed.By analyzing each factor separately,the influence of each factor on the force of pier and column is obtained,and the most disadvantageous force of pier and column is obtained.It is found that the impact coefficient of main beam is less than that of pier and column.Analyze the influence of multiple factors,combine the upper structure of the bridge,the lower structure and the foundation separately to analyze the longitudinal oscillation displacement of the pier and its force,analyze the crack of the pier and the shear slip of the bearing,and Contrast with actual observations.