Study On Seismic Behavior Of Prefabricated Reinforced Concrete Arch Bridges

Yunnan has a wide distribution of mountainous areas with frequent occurrence of strong earthquakes.Due to the advantages of strong spanning capacity,simple structure,construction is convenient,beautiful modelling,etc,prefabricated reinforced concrete arch bridge is widely used in Yunnan mountainous area highway bridge construction.Node is the main force component of bridge structure.Under the action of earthquake,the stress in the node area is more complex,and the damage phenomenon is easy to occur.Based on node earthquake damage phenomenon and the main theories of predecessors' research results,this paper aimed at the research of the strong earthquake prefabricated reinforced concrete arch bridge seismic response of the bridge and the seismic performance of reinforced node.Under the guidance of theory,the relevant research works were carried out.The main contents of the study are as follows:(1)By arranging the foreign and domestic prefabricated reinforced concrete structure node location studies on seismic behavior of the status quo,the basic theory of node failure knowledge has been sorted out.And the basic characteristics of the commonly used way of node reinforcement has been summarized.(2)Based on the Be-fu bridge project in Yunnan province,the whole bridge model is established using the finite element software SAP2000.Through the analysis of the dynamic performance of the structure under seismic action value and seismic response,the dynamic elastic-plastic time-history of the whole bridge under the action of the earthquake and the plastic deformation of the whole bridge and the plastic development of the hinge were obtained.And then,the distribution characteristics of the plastic zone was also summarized.(3)The experiment studies of the plant steel reinforcement node,steel-encased,FRP reinforcement steel reinforcement node pseudo-static have been done.In the experiments,in order to approximate node location in the earthquake under the action of stress,a constant vertical compressive stress and the horizontal displacementreciprocating have been put on the top of the test specimen.By observing the node deformation characteristic and failure phenomena of the specimens,collecting load displacement and load information,energy dissipation of the specimens hysteresis curve and curve of bending Angle have been drawn and the strengthening energy performance and plastic deformation capacity of the specimens have been analyzed.(4)Strengthening the node model is established using the finite element software ABAQUS.Carrying on the simulation analysis,a model of hysteretic curve and the relationship between bending Angle are obtain.Finally,the test analysis results were compared with the results of finite element simulation.