The Study Of Seismic Performance For Self-centering And Energy Dissipating Pier

Bridge structure is an important building connected to the earthquake zone and the outside world, its safety under seismic and good after the earthquake is great significance for social economy. And the seismic performance of bridge structure to a large extent depends on the seismic behavior of the bridge pier, so the seismic performance of piers that is more superior is studied in the paper,it is very urgent. Combining with the structure of energy dissipation damping technology and based on the performance of the seismic, the structural components, mechanical performance, calculation theory and finite element simulation technology is studied. Through numerical calculation and simulation technique, the performance of the pier is derived from set components different parameters of self-centering and energy dissipating piers,and Verify the self-centering and elimination to the superiority of the piers. In this paper, specific research job are as follows:(1) The concept of self-centering and energy dissipating pier is proposed, it load beared by pier、self-centered by prestressed reinforcement、the earthquake energy dissipated by dampers and horizontal shear resisted by jogged joint that pier is articulated in the foundation. The type of energy dissipation device damper, the performance and the restoring force model are studied. And by comparing energy dissipation device damper, the low yield point of mild steel damper is chosen as energy dissipation component of self-centering and energy dissipating pier.(2) Considering the mechanical properties of the components, hysteretic loop of self-centering and energy dissipation piers is flag type. Reference to an engineering example, hysteresis curve of self-centering and energy dissipating pier under horizontal loading is obtained according to numerical analysis theory. and designing damper different yield force, the initial stiffness, position and the initial tension, rigidity of prestress concluded its influence on the mechanical properties of self-centering and energy dissipating pier. By comparing results based on the different component parameters it is concluded that: the greater the yield force of damper, pier hysteresis curve more full; The effect of the initial stiffness of damper is little; The greater rigidity of prestressed reinforcement, the bigger stiffness of bridge pier column in the swaying process; the greater initial tension of prestressed, the bigger critical load of pier column; Assume that all the energy consumption provided by the damper, the three steps of piers design method is proposed.(3) In terms of hysteretic performance simulation, spring model of self-centering and energy dissipation piers is established based on sap2000 platform, and simplified numerical simulation method is using multiple linear elastic spring instead of prestressed reinforcement, the elasto-plastic spring instead of damper, To verify the influence of components for the hysteretic properties of the bridge pier; the pushover analysis and the dynamic time history analysis with the model have been done. Based on this model, energy dissipation damper outer bridge pier column is the largest, but the numerical results indicate damper position didn’t have influence on the hysteresis curve of bridge pier column. The results of numerical calculation indicate the influence of other component parameters is same. At the same time nonlinear dynamic time history analysis is done for the self-centering and energy dissipation and traditional bridge piers, the seismic behavior of the two kinds of bridge pier is researched under seismic waves. Results show that the performance of the self-centering and energy dissipation piers spring model under earthquake action is more stable, the maximal displacement of the self-centering and energy dissipation piers is greater, residual displacement is much smaller than the traditional bridge pier structure, the performance of self-centering and energy dissipation piers after the quake is good.