Research On Seismic Performance Of A New Self-reset Segmental Bridge Pier

As an important part of the traffic channel,if the bridge encounters earthquake damage,the consequences are immeasurable.Therefore,the research on bridge seismic technology is particularly important.As a rapidly developing bridge component in recent years,self resetting fabricated pier has strong practical significance to study its seismic performance and post earthquake repairable performance.Based on the idea of structural energy dissipation and damping,this study developed the self resetting segmental assembled Pier Based on the traditional self resetting assembled pier,and studied the advantages and seismic performance of the self resetting segmental assembled pier structure.The specific research contents are as follows:(1)According to the concept of traditional self resetting prefabricated pier and the components of pier,the action mechanism of each structural element is deduced.Aiming at the shortcomings of existing self resetting prefabricated pier,a new self resetting segmental assembled pier component is designed,and the mechanical action mechanism of pier model is deduced and analyzed,so as to provide theoretical support for the design and research of self resetting pier.(2)The existing traditional grouting sleeve self resetting assembled pier test is verified by using the finite element numerical analysis software,and the results of the finite element numerical model and the original test model are compared and analyzed.It is found that the analysis results of the numerical model are basically the same as those of the original experimental model,which shows that the numerical modeling method proposed in this study is effective.(3)The seismic performance of self resetting segmental assembled pier is studied,the self resetting segmental assembled pier proposed in this study is modeled and analyzed,and the analysis results are compared with the existing finite element analysis results of traditional fabricated self resetting pier.It is found that under cyclic loading,the yield stiffness of self resetting segmental assembled pier is 11.01% higher than that of traditional pier,and the maximum residual displacement of self resetting segmental assembled pier is only 39.19% of that of traditional self resetting pier.Self resetting segmental assembled pier shows better self resetting performance.(4)For the self resetting segmental assembled pier,six different working conditions are set by controlling variables.The seismic performance of the pier with three different axial compression ratio parameters and three different prestressing strength parameters is analyzed and studied.The research shows that the increase of axial compression ratio can improve the ultimate load and self resetting performance of self resetting segmental assembled pier,and can better improve the overall stability of pier structure.Increasing the prestressing force can enhance the ultimate bearing capacity and yield stiffness ratio of pier structure,and improve the self resetting capacity of pier structure.This study has a certain reference significance for the design of self resetting segmental assembled bridge.