Experimental Study And Numerical Simulation Of Seismic Behavior Of Prefabricated RC Arch Bridge Column Joints

As an important part of the transportation route,bridge engineering plays a decisive role in ensuring the normal,fast and efficient operation of the road network.Once the bridge structure is damaged in the earthquake,the entire route will lose its capacity,rescuers and supplies will be affected.In the process of seismic design of bridges,nodes as an important part of the bridge structure have an important impact on the seismic performance of the bridge structure.A lot of researches have been conducted on the seismic performance of reinforced concrete column joints at home and abroad,but the research and understanding of prefabricated nodes is still insufficient.With the requirements of rapid production in recent years,more and more prefabricated bridge piers have been used in engineering projects.Therefore,it is necessary to provide a technical reference for engineering practice in the seismic performance study of prefabricated bridge piersBased on the research results of seismic behavior of building structures and bridge structures,this paper designs 10 reinforced concrete column joints of different strengthening and reinforcement according to the transformation of the Nujiang Bifu Bridge and carries out the low cycle reciprocating cyclic loading test.By using the large general finite element software ABAQUS/CAE,the numerical model of four components was built to simulate the reciprocating loading process.The seismic performance of the prefabricated joint members was compared from several angles.The main research contents of this thesis are as follows(1)Theoretical study on seismic performance of joints.Based on the literature database resources,a large number of texts and inductions are summarized,and the factors affecting the seismic performance of the piers are summarized and analyzed,such as the reinforcement ratio,the geometrical characteristics of the sections,and the load effects,etc.(2)Investigating of the Bifu Bridge in Nujiang was conducted,and determined the node strengthening and reinforcement program based on the survey data,and formulated a reasonable quasi-static test plan.The arch-column joint test members were fabricated,and the displacement and strain sensors were set to respond to the concrete and steel bars during the low-cycle reciprocating cyclic loading of the column joints.(3)Comparative study on seismic performance test results of reinforced concrete column joints.The quasi-static test is carried out on 10 members,and the test phenomena are analyzed.The failure modes of the test members are summarized,from the load-displacement hysteresis curves of the members,the skeleton curves,the stiffness degradation curves,the ductility performance and the energy consumption capacity,analyzing the seismic performance of the nodes from different angles.(4)Seismic behavior of prefabricated reinforced concrete column joints based on numerical simulation.Based on the experimental research,four representative components were selected,and the numerical analysis model with the same size,strength and reinforcement was established by using ABAQUS large-scale general finite element software.Simulate the pseudo-static test loading process,observe the final failure state of the test piece,and compare the numerical model calculation results with the test results.