The Experimental Research And Finite Element Analysis On Seismic Behavior Of Column-plate Members

Our country is vast in territory, subject to the limitations of the terrain conditions, many high-speed rail line, passenger line projects often have to cross rivers and lakes, canyons, high earthquake intensity areas of complex terrain. Therefore, the engineering application of high pier bridge is increasing. And the research on seismic of the high piers domestic mainly concentrated on the traditional round- shaped or rectangular hollow, but the traditional high piers have many shortcomings in the seismic performance. In order to further enhance and improve the seismic performance of hollow high pier, at present abroad is the research and application of a new column-plates type of hollow high pier bridge that is superior to the traditional hollow high pier in the seismic performance. But currently domestic almost has not for the theoretical and experimental study of this pier. To understand the failure and the hysteretic characteristics of this kind of bridge pier, this paper takes Zong mugou Bridge pier of Huang-Han-Hou railway as the prototype, intercept the third stage of 5# column-plates type hollow pier to design the test model, the pseudo-static test conducted on 3 transverse and 4 longitudinal reduced scale model and one framework model of transverse model corresponding of the ratio of 1:10, Through observation, recording, data collection and analysis of test and ABAQUS finite element numerical analysis to study the failure characteristics, mechanical properties, hysteretic curve, skeleton curve,ductility,energy dissipation and stiffness degradation ability of seismic properties of column-plates type hollow pier. And contrast and analysis the different of the column- plates structure and the frame structure in seismic performance, mechanical characteristics and failure characteristics caused by the interaction of " column-plates ", the conclusions are as follows:(1) The column-plates structure begin failure from the plates’ holes surrounding with the inclined crack and occur shear failure. When the plates occur shear failure, the columns are not yield, with further loading, the columns last occurrence of bending failure. Frame members occurs typical failure of bending failure.(2) The column-plates structure has good energy dissipation capacity, hysteretic curve area is large, well energy consumption, and slower stiffness degradation, strong rigidity and deformation capacity. when the plates dissipate energy and occur failure, the columns still have a lot of bearing capacity and stiffness, can ensure that the main structure doesn’t occur collapse. From the restoring force curves of frame members and column-plates structures can be seen, the column- plates members due to the interaction of " column-plates " significantly improved the structural resistance, stiffness, total energy- dissipation and ductility than the frame members, and the seismic performance is well.(3) Increase the plates’ width of the column-plates structure, can significantly improve the strength and stiffness of the structure and improve the cumulative energy and ductility coefficient when they occur damage, but the energy dissipation coefficient is smaller in the same displacement conditions. Compared with the column-plates structures and frame structures, when the displacement is small the column-plates structures energy dissipation coefficient is larger, when the displacement increases to a certain value the column-plates structures energy dissipation coefficient will appear slightly smaller than the frame structures, but the total cumulative consumption energy and ductility are obvious improved.