| At present,China’s bridge industry is constantly developing,so it puts forward higher and higher requirements for bridge construction technology.For some construction projects with complex construction environment and unable to meet the conditions of cast-in-place construction,the traditional cast-in-place construction technology has certain limitations in some aspects,and apparently can not meet the requirements of the current stage of construction.As a new construction method,assembly technology has received more and more attention.Due to the late start of assembly-type technology in China,the research on construction technology and mechanical properties is still in the early stage of exploration.So far,assembly technology is mostly applied to the superstructure of Bridges,and assembly technology is mainly applied to the substructure of some Bridges located in low-intensity earthquake areas.However,the application of assembly piers to Bridges in strong earthquake areas is still in the research stage,and its safety and seismic performance are both key and difficult issues.In this paper,based on the background of No.4 Yaoma Village Bridge,a quasi-static test was carried out on the seismic performance of prefabricated pile piers with flange connection,and three groups of 1:2 scale model specimens(cast-in-place specimens,prefabricated specimens with flange one-connection and prefabricated specimens with flange two-connection)were designed.Through the test phenomenon and test results,the reliability and seismic performance of the flange connection mode are analyzed to provide reference and basis for the application of the flange connection in practical engineering.The influence of the flange on the internal force and the displacement of the pier top under the E1 and E2 earthquakes is analyzed by the finite element software MIDAS /Civil.The research content and main work of this paper are as follows:(1)Through literature research,the application and seismic performance related research of prefabricated bridge piers at home and abroad are summarized and summarized,and the research content and research purpose of this article are proposed based on actual engineering.(2)The design parameters and test scheme of the three groups of specimens are introduced in detail,and the damage situation and failure phenomenon of the three groups of specimens are compared.It can be seen from the phenomenon that the final failure phenomenon of the three groups of specimens is roughly the same,the final failure is that the concrete at the plastic hinge part of the pier bottom is crushed,the main reinforcement and stirrup are buckled,and the flange of the fabricated specimen is not damaged,which verifies the reliability of the flange connection.(3)The test data was processed and analyzed,and the bearing capacity,hysteresis characteristics and displacement ductility of the three groups of pier specimens were obtained and compared to evaluate the seismic performance of flange-connected fabricated piers.(4)Based on the ABAQUS finite element software,the test specimens are numerically analyzed.Through comparison,it is found that the finite element calculation results are in good agreement with the test analysis results,which provides a basis for the seismic performance research of flange-connected fabricated piers.(5)Through the response spectrum analysis of finite element software Midas/Civil,the influence of flange plate on the internal force of pier under E1 and E2 earthquake is studied.The results show that flange plate has little influence on the internal force along the bridge,but has great influence on the internal force across the bridge.In practical engineering,the parts with great influence should be reasonably strengthened. |
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