Study On The Factors Affecting The Seismic Performance Of Self-resetting Energy Dissipation Bridge Piers

The design concept of traditional bridge pier is based on ductility,which has a large residual strain after the earthquake,which not only causes the difficulty of repair,but also causes a large amount of waste of resources.The most important thing is that the repair or reconstruction takes a long time,which misses the best rescue time.Is put forward based on the performance of the reset pier design concept,this kind of bridge can be generated through own prestressed restoring force,through the steel consumption reduce seismic energy,thus basic won't produce residual strain,through a simple repair can continue to use,and are separate from the pier and the pile caps,have prefabricated bridge pier construction fast,affected by the environment of small advantages,will be one of the important direction of bridge seismic in the future.(1)Shows that since the restoration of bridge piers research significance,combined with the research status at home and abroad,introduces the reduction and the structure of the bridge pier,and the working principle,analyzed the damage form of bridge pier,from two aspects of flexural bearing capacity and the shear bearing capacity of bridge pier mechanical performance analysis,get the limit state of the pier top displacement and shear bearing capacity and provide theoretical basis for design based on the displacement.(2)The finite element software was used to analyze the quasi-static force of the traditional pier,the self-resetting pier and the self-resetting pier with no energy dissipation reinforcement.The results show that compared with the traditional pier,the self-resetting pier has the advantages of high energy dissipation capacity,small residual strain and high bearing capacity.The energy-dissipating reinforcement can greatly improve the seismic performance of self-resetting pier.(3)To explore the change the arrangement of prestressed reinforcement,the initial prestress and reinforcement ratio on the reduction and the influence of the seismic performance of bridge pier,the results showed that the increase of the prestressed reinforcement spacing of bridge pier energy dissipation capacity,ultimate load and ductility performance has improved,increasing the initial prestressed pier of energy dissipation,yield load,ultimate load and ductility performance has improved,increasing the reinforcement ratio of pier energy dissipation,yield load and ultimate load has increased,but the ductility performance.(4)To join the improvement of composite bearing the restoration and improvement since the reset bridge piers by quasi static analysis and dynamic time history analysis,the results showed that under quasi static loading,the improved energy dissipation piers,yield load and ultimate load are higher than did not improve the reset piers,ductility performance slightly smaller than normal since the reset pier,but still has a good ductility performance.Under the dynamic load,the displacement and acceleration of the improved pier top are both smaller than that of the unimproved self-resetting pier,which indicates that the addition of composite support greatly improves the seismic performance of the self-resetting pier.