| Precast bridge abutments are increasingly used in the field of bridge construction.They have the advantages of a short construction period,easy monitoring of construction progress,and simple maintenance in the later stages.Today,in the process of modern bridge construction,our structural design of bridges is not only satisfied with making it safer and more durable.It is necessary to gradually increase efforts to reduce interference with existing traffic and continuously increase the speed of construction.The application of prefabricated pier in practical engineering is still limited by many factors,Especially in earthquake prone areas,Because in terms of structural stiffness,The fabricated pier is still inferior to the monolithic pier,At the same time,the occurrence of earthquakes is usually uncertain,So it is more and more important to study the mechanical performance of prefabricated pier under earthquake.In this paper,the pseudo-static analysis method and the dynamic time-history analysis method are respectively adopted,and the ABAQUS software modeling is used to simulate and analyze the prefabricated bridge piers to study their seismic performance.The main research contents are:(1)By consulting various related documents,the development research status of prefabricated bridge piers at home and abroad is summarized,and the current prefabricated bridge piers are analyzed for their shortcomings in anti-seismic aspects.(2)Briefly describe the connection technology of the fabricated bridge piers and the theoretical basis of earthquake resistance,which provides an effective guarantee for the earthquake resistance analysis of the bridge piers.(3)The quasi-static method is used to simulate and analyze the integral,sleeve-connected and bellows-connected piers established by ABAQUS,and the hysteresis curve obtained is compared with the reference to verify the accuracy of the modeling analysis.Based on this research,continue to change the length of the steel sleeve connection,and analyze the impact of the change of this factor on the seismic resistance of the fabricated bridge pier.(4)Three seismic design parameters are mainly studied: constant load axial compression ratio(CLACR),longitudinal reinforcement ratio(LRR)and dense stirrup spacing(EZSS).The horizontal bearing capacity of bridge piers increases with the increase of CLACR,while ductility and deformation decrease.The improvement of LRR also increases the horizontal bearing capacity,yield displacement and ultimate displacement of the pier,with no obvious changes in ductility and deformation;EZSS has no obvious change in the horizontal bearing capacity of the pier,but it effectively improves the ductility of the pier.At the same time,with reference to physical drawings,physical bridge piers were established,and the seismic performance of fabricated bridge piers under different connection forms was analyzed. |
