Experimental Study And Numerical Simulation On Compressive Behavior Of Damaged Reinforced Concrete Columns Reinfopced By HDC

Due to the rapid development of urban processes,most of the buildings that were built at the end of the last century cannot meet the existing requirements for living and use.Some of the building stractures have been damaged and can no longer meet the general structural design requirements.Therefore,reinforcement is urgently needed.If we cat study and analyze the way of reinforcement or reinforcement materials with Mgher performance,we can greatly delay the damage process of the structure and increase the life cycle of the structure.Therefore,the research on effective reinforcement of building structures has become an increasingly hot research topic in the industry.Based on the research on the ratio of high ductility concrete carried out by the laboratory group,this paper selects a set of optimal ratios as the outer reinforcement material,and carries out the reinforcement test research on the axial compressios of reinforced damaged concrete columns.HDC with the same thickness were ised to reinforce the components.The damage process and destruction phenomenon of the axial compression under the reinforcement mode were observed.The test results show that the components have good plastic properties and no obvious brittle failure with this way of reinforcement.Strengthening reinforced concrete columns with HDC can effctively improve the ductility of members,which is also extremely beneficial to structural earthquake resistance.In this paper,the finite element analysis program ABAQUS is used to build the component model and simulate the test process.The comparison between the simulation results and the experimental results shows that the model is more consistent.Then the finite element analysis of reinforced concrete columns under axial and eccentric compression is carred out.In the research of axial compression,the reinforcement thickness of HDC is taken as the main research parameter,and several groups of finite element components are established for research and analysis.The analysis shows that the bearing capacity of the concrete columns strengthened by 10mm,15mm and 20mm is increased by 18.6%,24.7%and 34.8%,respectively.The high ductility concrete material can effectively provide lateral restraint and improve the bearing capacity of the components.As the thickness of the reinforcing material increases,the amount of vertical displacement decreases,and the deformation resistance of the member is enhanced.In the study of eccentric compression,this paper establishes the finite element components with different reinforcement thickness and different eccentricity for the experimental study of eccentric compression.The results show that the bearing capacity of unconstrained and constrained components is reduced with the increase of eccentricity to some extent.Moreover,the ultimate plastic strain of HDC is greater than that of concrete,which reflects the good mechanical performance of HDC.The slope of the increase amplitude of the eccentric bearing capacity strengthened by different thickness is higher than that of the axial bearing capacity.Due to the lateral restraint of the reinforcing material,the larger the eccentricity,the larger the compression zone of the concrete section and the greater the ultimate compressive strength of the concrete.However,as the thickness of the reinforcement increases,the ultimate compressive stress of the concrete portion decreasesBased on the theoretical analysis of the test data and the bearing characteristics of the axial compression and eccentric compression with the way of reinforcement,and formulates the ultimate bearing capacity formula of the high ductility concrete reinforced concrete column by f ormula derivation.And the experimental value is compared with the calculated value,the comp arison result is in good agreement,which can provide reference for the way of reinforcement in actual engineering.