Numerical Simulation And Seismic Performance Analysis Of High Strength Reinforced Concrete Column Based On ABAQUS

Column is one of the main load-bearing components in building structure,the damage of the column in the earthquake will cause great safety hazard to the whole building.The traditional column members of buildings use ordinary steel as bearing steel,which will result in a larger section of the designed column members when the load is large,not only affecting the aesthetics of the buildings and the use of space,but also consuming too much steel bars and affecting the construction progress and the quality of column members.The configuration of high strength steel bar can improve the bearing capacity of column and reduce the size of column section,at the same time,it can also reduce the consumption of steel bar and reduce the cost of building.In this paper,the seismic performance of high strength reinforced concrete column is comprehensively analyzed and the theoretical basis for its application in engineering practice is provided.In this paper,12 reinforced concrete columns were designed,numerical simulation analysis was carried out on them under the action of repeated horizontal loads with ABAQUS software,and compares it with the typical failure modes of reinforced concrete test columns: the influences of different axial compression ratio,longitudinal reinforcement strength,stirrup spacing,concrete strength grade,stirrup form and stirrup strength on failure mode,bearing capacity,ductility performance,stiffness degradation and energy dissipation capacity of column components were compared.Besides,the difference between the seismic behavior of reinforced concrete columns with high strength reinforcement and ordinary reinforced concrete columns under the same condition is compared and analyzed.The results show that the hysteretic properties,ductility and energy dissipation of the columns can be improved by using high strength steel bars;Compared with ordinary reinforced concrete columns,the hysteretic and ductility properties are better when high strength steel bars are used for longitudinal and stirrup,and the ultimate bearing capacity of column members can be improved.In the case of high strength stirrups,improving the restraint effect of stirrups on the core concrete can significantly improve its hysteretic performance,ductility performance and energy dissipation capacity,as well as the bearing capacity of columns.Compared with the ordinary reinforced concrete column,the failure mode of the column is less affected by the adoption of high strength steel bar,but the cumulative residual deformation valueof the column is larger when the column is destroyed.In order to make the simulation results more accurate,the USTEEL02 subroutine in pq-fibe was used to simulate the bond slip of the reinforced concrete interface,and the hysteretic rules in ABAQUS software were taken into account.The formula for calculating concrete damage factor was derived.The selection of constitutive structure,element selection,meshing,loading system and failure criterion are discussed and verified in detail.On the basis of verification,the seismic behavior of high strength reinforced concrete column is simulated.