The Study Of Seismic Behavior On Solid Piers With Round Ended In High-speed Railway

Because of speediness, comfort, punctuality, large transport capacity and other advantages, high-speed railway has rapid development at home and abroad. Accounting for a large proportion of the total line, high-speed railway bridges are becoming the most structures in high-speed railway system. Under earthquake, the seismic behavior on piers which are main structural components to resist lateral force is crucial. While research on this side mainly results for highway piers both at home and abroad, the analysis of the elastoplastic seismic response on high-speed railway piers with round-ended and low ratio of reinforcement is little studied and the result is scattered, so research in this aspect is of great significance and practical value. The main contents in the paper are as follows:First of all, referring to the domestic and foreign research situation, propose the scheme of pseudo-static test for the high speed railway solid piers with round-ended. Based on the failure pattern, hysteresis curve, skeleton curve of the tested specimens, parameters such as shear span ratio, longitudinal reinforcement ratio, stirrup ratio, axial compression ratio that affect the seismic behavior index such as bearing intension, stiffness, ductility, energy dissipation are analyzed,including significance and trend. Main results:with longitudinal reinforcement ratio and axial compression ratio increasing, ultimate load will increase; with the increase of longitudinal reinforcement ratio and axial compression ratio, displacement ductility coefficient will decrease obviously, stirrup ratio on the side is not significant; with the increase of longitudinal reinforcement ratio cumulative dissipated energy will increase significantly, with the increase of axial compression ratio cumulative dissipated energy will increase slightly.Secondly, on account of the test results, using the related softwares, the test datas are nonlinearly fitted. Obtain the restoring force model of three linear degradation skeleton curve, then contrast with test skeleton curve.The result shows that both coincide with each other well, and confirm that the simplified model is reasonable.Combining with the fitted unloading stiffness and reloading stiffness formulas, put forward suitable hysteretic rules of restoring force model to provide theoretical basis for engineering practice.Finally, using ANSYS which is the universal finite element analysis software, the specimens are nonlinearly calculated. The results are compared with experimental ones, showing that both coincide with each other well, and verify the feasibility and accuracy of simulative calculation based on the platform of ANSYS under some kind of condition. Analyze the seismic parameters, then put forward the reasonable suggestions about steel ratio.