Finite Element Analysis Of Seismic Strengthening Of Long Span Rigid Frame Bridge With High Piers

The seismological movement is uncertain.The active bridge is prone to damage under earthquake.In order to improve the overall seismic performance of the structure under earthquake,it is necessary to study the seismic performance and reinforcement analysis of the bridge according to the fortification intensity.Due to the complex,there are few researches on nonlinear analysis of rigid frame bridge under earthquake action.Based on the detailed description of the present stage seismic research methods,the advantages and disadvantages of each method are summarized.Based on this background,the ANSYS program is applied to simulate the structural behavior of the Long Span Rigid Frame Bridge with High Piers under two kinds of earthquake actions..Through the APDL command flow,we can reasonably select the parameters,mesh and boundary constraints for the structure,select the SOLID65 cell to carry out the overall model simulation,and get the basic frequency.Combined with relevant provisions of Bridge Specifications and proportional adjustment method,seismic wave is selected to study the structural change rule under the action of E1 earthquake and E2 earthquake.Based on the analysis of the stress distribution under the earthquake action,the stress of the pier is determined and the weak position is found.Taking pier as the object,nodes are acquired along different heights.According to the displacement time history diagram,the maximum displacement value of the structure is the bottom to the top,and it increases within a certain range.Since the structure adopts two limb thin-walled piers,the joints are selected at the same structural part of 1# pier and 2# pier for lateral comparison.Through the numerical relationship between the two displacements,it is concluded that the two legged have the equal load and long life.In order to improve the performance,the method of increasing the cross section of the bridge pier is adopted to consolidate,and the seismic response of the model before and after reinforcement is studied at the same level.This method is effective in improving the overall stiffness of the structure.