Research On Applicability Of New Type Assembled Piers Of High-speed Railway Bridges Based On Rapid Repair

As China’s strength in all aspects continues to grow,the traffic volume is increasing.And the pace of high-speed railway construction has gradually stepped into the western region,making it a key area for development.However,many western region are located in the junction zone of the earth plate.And the seismic activity is frequent and intense,which makes the design and construction of high-speed railway lines and bridges particularly difficult.As the main load-bearing structure,once the pier is damaged,it will have a huge impact on the whole bridge.Therefore,the design and research of high-speed railway piers with convenient construction and excellent seismic performance become the only choice.Firstly,based on a bridge project of high-speed railway line in high intensity area,this paper designs and optimizes three kinds of new fabricated concrete-filled steel tubular hollow piers with different cross-sections(DCHP-C pier,DCHP-S pier and DCHP-D pier)and cast-in-place reinforced concrete hollow piers with double columns(RC pier)according to the current national codes and standards by reading a large number of literature and materials.Determines the connection between the components of the three fabricated piers.And the static analysis is carried out.Secondly,the fiber models of four kinds of piers are established by using Open SEES finite element software.And the quasi-static test simulation is carried out to obtain the seismic performance index.The seismic performance of four kinds of piers is compared and analyzed.Finally,four kinds of piers are applied to bridge engineering examples,and the seismic response of the whole bridge is analyzed by using dynamic time history analysis method.By increasing the peak acceleration of seismic wave,the peak acceleration of seismic wave required for four kinds of piers to reach their respective yield state is obtained,so as to evaluate the seismic performance of piers.