Study On Aseismic Performance For Column Joints Of Assembled Reinforced Concrete Arch Bridge In Meizoseismal Area

Since the 1990 s,a large number of prefabricated reinforced concrete arch bridges have been built in the mountainous regions of western China.At present,these arch bridges have not been maintained for a long time,and cracks and other diseases have appeared at the joints between the main arch circle and the column foot nodes.If many subsequent earthquakes or strong earthquakes occur,the risk of the collapse of the bridge will increase,and the seismic fortification requirement of "big earthquake would not let it collapse" can not be realized.On the basis of the research results of the seismic performance of the prefabricated structural members,the elastoplastic performance of the joint of the column and the main arch is explored by using the results of the seismic response analysis and the experimental results of the full bridge of the assembled reinforced concrete arch bridge with the strong earthquake zone,combined with the theoretical calculation results of the Abaqus CAE finite element analysis program.The purpose of this paper is to analyze the failure modes of the assembled arch bridge joints,and put forward some suggestions for how to design this type of joints reasonably when designing the new bridge.The specific contents of the study are as follows:(1)To summarize the generation and development of prefabricated arch bridges,through Midas Civil modeling calculation and analysis.The response spectrum and the time history seismic analysis of the bridge integral model are carried out,and the weak position of the arch bridge's anti-seismic performance is studied.(2)Conduct node tests.Through the analysis of the model,the weak position of the seismic performance is found and the design is strengthened.The test components are made repeatedly and the test phenomenon will be analyzed.(3)Perform finite element modeling analysis on the test components.Simulate the test process,and obtain more accurate theoretical analysis data to explore theelasto-plastic mechanical properties of the joints,In the end,compare them with experimental test data.(4).Conduct time history analysis of full-bridge seismic performance.The good data with experimental results were brought into the overall bridge model,and the time-history analysis was performed on the full-bridge model.The general method of enhancing the seismic performance of prefabricated arch bridges in the design process was obtained.This paper focuses on the analysis of the damage form of the node position,and aims to explore the effectiveness of several simple and feasible node region strengthening schemes.It will provide reference for the designer in the design process of the new bridge of the prefabricated arch bridge.