Seismic Performance Analysis Of Socket Type Prefabricated Bridge Pier

With the implementation of the national project “Eight Vertical and Eight Horizontal High-speed railway network” and the improvement of urbanization rate,more and more bridges will be rebuilt or renovated.However,the traditional bridge construction is faced with a series of drawbacks,including the long construction period,affecting the smooth and safety of roads in the construction area,and causing environmental contamination.The prefabricated bridge is constructed by various prefabricating components that are prefabricated in the factory and are transported to the site for assembly.It not only saves the construction period and reduces pollution,but also all components are standardized in the factory,which improves the quality of the bridge.More and more bridges in our country also adopt assembly construction.At present,the research on prefabricated bridges is mostly aimed at the stress deformation analysis and failure behavior of pier members under static state,and the practical application projects are mostly limited to low intensity areas.The research on the seismic performance of socket-based bridge piers is still insufficient,which limits the popularization and application of this bridge system.Based on the “reconstruction and expansion of Beijing-Taiwan expressway prefabricated bridge project”,the finite element software ABAQUS is used to carry out the seismic performance analysis of socket-type bridge piers.Combined with the existing research,the analysis of parameter sensitivity influence law is further carried out,and the research results can provide references for the seismic design of bridges of the same type in the future.The main contents of this study are as follows:(1)This paper carry out research on the "reconstruction and expansion of Beijing-Taiwan expressway prefabricated bridge project” and summarize the complete set of construction technology of prefabricated piers,which serve as an effective reference for the subsequent establishment of solid finite element models.In addition,this paper summarize and analyze the existing bridge seismic theories and provide theoretical guidance for the seismic analysis of fabricated bridge piers studied in this paper;(2)The finite element software was used to conduct numerical simulation analysis on the experiments of existing scholars and the experimental results were compared.The rationality and accuracy of the finite element software to simulate the seismic analysis of bridges be verified.The purpose of which is to pave the way for this paper to carry out finite element numerical simulation combined with actual engineering projects;(3)Combined with practical engineering,the solid finite element model of socket pier is established,and the seismic performance of fabricated pier with socket connection under cyclic repeated displacement load is analyzed.In addition,this paper also conduct a parameter sensitivity analysis of the bridge pier using the socket connection and assembly technology,including the study of the seismic performance under different parameters of axial compression ratio,longitudinal reinforcement ratio,concrete strength,socket depth and pier height.This paper specifically analyze the seismic indexes such as hysteresis curve,skeleton curve and stiffness degradation of the bridge pier structure,and summarize the influence laws of various research parameters,so as to provide reference for future bridge design using similar engineering technology.(4)By selecting the real seismic wave and amplitude modulation according to the code,the corresponding acceleration time history curve is obtained,and the corresponding seismic excitation be input into the finite element software to analyze the relative displacement response of the pier top of the fabricated bridge pier.At the same time,the parameters of longitudinal reinforcement ratio,axial compression ratio,concrete strength,socket depth and pier height are analyzed by nonlinear dynamic time history analysis.