Study On Seismic Behavior Of Prestressed Segment Assembly Composite Bridge Piers

In the energy-saving,green,low-carbon increasingly important era,the prestressed segment of the construction process of the bridge pier is short,the construction of the surrounding environment and traffic impact of small,onsite assembly efficiency and other advantages gradually attention,is bound to become the future bridge construction development trend.Prestressed segment assembling piers are becoming more and more important in the tide of construction industry.The prestress assembling technology of bridge pier is the development direction and research hotspot of the times.In this paper,the concept of "composite piers" is proposed.The seismic performance of prestressed joint is analyzed by quasi-static test,and the numerical simulation is carried out to explore the prestressed joint.The seismic damage mechanism and the effective numerical simulation method,and on this basis,the parameters of the analysis and seismic time history analysis.This paper is carried out under the support of the research on the seismic performance of the prestressed segmented composite piers in Hebei Province.The main tasks include:(1)Completed the design and implementation of pseudo static loading test and obtain reliable test data,based on the test data and test analysis of morphology,and analysis the 3 piers hysteretic curves of seismic parameters.(2)Based on the OpenSEES seismic finite element analysis software developed by Berkley University in the United States,the numerical simulation analysis of the composite piers with prestressed sections is carried out,and the comparison between the calculated results and the experimental results is completed.(3)Based on the analysis of the experimental results,the influence of the important mechanical parameters on the seismic performance of the pier,such as strength,ductility,stiffness and energy dissipation capacity,is discussed systematically.(4)The values of key parameters and the key parameters of the prestressed segmental composite pier was studied further the model calculation and analysis,and the segmental prestressed composite pier by nonlinear dynamic time history analysis using OpenSEES software.Through the experimental analysis,numerical analysis,theoretical analysis,parametric analysis,prestressed composite bridge piers perform well in the strength,stiffness,energy consumption,ductility and other aspects,with good seimic performance,suitable for further research and promote the use in project.