The Influence Of The Connection Between Column And Beam On The Internal Force Of Main Arch Ring Of Reinforced Concrete Arch Bridge

Reinforced concrete arch bridges are widely used in earthquake-prone southwest areas.However,due to unreasonable structure,errors in calculation and natural disasters,many arch bridges have been damaged or even collapsed in recent years.How to improve the mechanical properties of reinforced concrete arch bridges is imminent.At present,the research on the mechanical properties of reinforced concrete arch bridges mainly includes the study on the parameters of the rise-span ratio and the arch axis coefficient of the main arch ring,as well as the materials(reinforced concrete,concrete filled steel tube,section steel,etc.),the form of section(size,section shape,hollow solid,etc.),the number and span(equal span,unequal span),and the study on the parameters of the arch building materials(reinforced concrete,concrete filled steel tube,section steel,etc.).There is little research on the mechanical properties of reinforced concrete in the connection form of column and main beam.Therefore,this paper studies the influence of the connection form between the arch column and the main girder on the internal force of the main arch ring with the help of a deck reinforced concrete arch bridge in a rebuilt railway line.The main research contents and conclusions are as follows:(1)Discuss the connection form between the arch column and the main beam.In the original design,beam-column consolidation or movable support are adopted.This paper follows the original design idea and arranges movable support according to the principle of symmetry.According to the number and location of movable support,7 models are established by using the finite element software Midas Civil.(2)Discuss the influence of the connection form between the arch column and the main beam on the internal force of the main arch ring of the arch bridge under static load.In this paper,two kinds of internal force combination are set up according to the code and the actual stress condition of arch bridge,and the difference between the two kinds of internal force combination results is analyzed.The influences of the arrangement of movable supports on the axial force,transverse shear force,vertical shear force,in-plane bending moment and out-of-plane bending moment of the main arch ring of reinforced concrete arch bridge under static load are obtained.(3)Discuss the influence of the connection mode of the arch column and the main girder on the internal force of the main arch ring of the arch bridge under earthquake action.Two main seismic design methods(response spectrum analysis method and dynamic time history analysis method)are used to analyze the arch bridge model,and some key problems in seismic analysis(proper selection of eigenvalue analysis method,selection and adjustment ofseismic waves,etc.)are studied.The influence of the arrangement of movable supports on the internal force of the main arch ring of reinforced concrete arch bridge under earthquake action is obtained.Through the numerical analysis of 7 arch bridge models,the problem of selection of connection schemes between arch columns and main girders is solved.Meanwhile,the selection methods of various parameters of arch bridges in static and dynamic analysis are analyzed.The influence law of connection forms between arch columns and main girders on internal forces of main arch rings of reinforced concrete arch bridges under various loads is summarized,which is similar to that in the future.The design of the connection scheme between the arch column and the main girder has guiding significance.