Study On The Seismic Performance Of A New Type Of Rocking Prestressed Bridge Pier

With the continuous improvement of China’s infrastructure construction,the bridge industry is also growing.The rocking bridge pier is the research focus of the bridge industry.Based on the design concept of "earthquake resilient structure",this dissertation uses self-locked blind bolt to design a new type of rocking prestressed bridge pier,and improves it through structural design.The focus of this dissertation is as follows:(1)A large number of relevant literatures at home and abroad have been consulted,the hysteresis mechanism of rocking bridge piers has been introduced in detail.The research status of rocking bridge piers,earthquake resilient structures and replaceable energy dissipation components at home and abroad has been summarized.(2)The existing quasi-static tests of integral piers and rocking piers have been simulated.Through the comparison between simulation results and test results,the reliability of the numerical model of the new rocking prestressed concrete bridge pier established by OpenSees software has been verified.(3)A new type of two-segment rocking prestressed concrete(RPC)bridge pier RPC1 with unequal lengths has been designed.A two-segment bridge pier RPC2 with equal lengths,a three-segment bridge pier RPC3 with equal lengths and a three-segment bridge pier RPC4 with equal lengths have been developed one after another.Mechanical behaviors of four kinds of bridge piers under quasi-static action have been calculated,and the difference of seismic performance among the four kinds of bridge piers has been analyzed.Based on this,the rocking prestressed concrete bridge pier system which is more suitable for the actual engineering needs has been recommended.(4)The sensitivity analysis of the factors affecting the energy dissipation capacity and self-center ability of the new rocking pier under low-cycle loading was carried out by the orthogonal test method.The priority of each influencing parameter was determined.The influence of key factors on the seismic performance of the new type of rocking prestressed bridge pier has been explored.