Study On Seismic Behavior Of Earthquake-Damaged Reinforced Concrete Frames Structures With Rapid Reversibility

In recent years,reinforced concrete frame structure has been widely used in Chinese architecture with its flexible spatial arrangement.In the earthquake,many frame structures collapsed and resulted in casualties.In addition,many concrete frames with varying degrees of damage collapsed in aftershocks due to the lack of rapid reinforcement,which not only increased the difficulty of rescue,but also led to the expansion of the disaster.It is of great practical significance to quickly repair the repairable reinforced concrete frame structure after the earthquake,both from the economic perspective and from the perspective of meeting the basic needs of the people in the disaster area.However,at present,the research on the reinforcement of earthquake-damaged reinforced concrete frame structure mainly starts from the perspective of post-disaster reconstruction,while the research on the rapid reinforcement method considering the time and constructing conditions is less involved.Based on this situation,the research work of this subject is carried out to study the seismic behavior of steel wire mesh composite epoxy/super early strength grouting material to reinforce the Earthquake-damaged reinforced concrete frame structure,which has important research value and engineering significance.The research contents and experimental results involved in this paper are mainly reflected in the following aspects:(1)Based on the previous research results of earthquake-damaged frame structure reinforcement technology,from the perspective of rapid repairing,the method of rapid reinforcement of earthquake-damaged concrete frame structure with steel wire mesh composite epoxy/super-early strength grouting material was proposed.Seven trusses of frames were designed and produced,one of which was a comparison frame,which was directly loaded to the failure standard under the action of low cyclic repeated load.The other six trusses of frames were subjected to the pre-loss test of low cyclic repeated load,the rapid reinforcement treatment of steel wire mesh composite epoxy/super early strength grouting material and the failure test of low cyclic repeated load,respectively.(2)Analyze and compare the parameters of hysteretic curve,skeleton curve,ductility coefficient and energy dissipation capacity of each specimen,and study the seismic behavior of steel wire mesh composite epoxy/super-early strength grouting material to reinforce the earthquake-damaged reinforced concrete frame structure.(3)Finite element simulation analysis was carried out on test specimens.This paper introduces the detailed process of modeling and analysis calculation by ABAQUS software,and analyzes the pre-loss treatment and failure of the specimen model through the finite element software,and analyzes the results obtained by the finite element calculation and the actual results obtained by the test.(4)Carry out parameter analysis based on finite element model.The effects of axial compression ratio U,grouting material thickness T and grouting material reinforing height H on the earthquake-damaged of the reinforced specimens were analyzed.