Finite Element Analysis Of Seismic Behavior Of High-strength Reinforced Concrete Special-shaped Columns

My country’s high-rise buildings are increasingly developing in the direction of large spans,high-rise and heavy-duty.This trend will increase the vertical load that the pillar will bear,the size of the column’s section will increase,and it will not affect the seismic.When inconsistent,the corners of the junction of the column and the wall will appear at the junction of the wall,affect the indoor beauty,and reduce the internal space utilization of the building structure.High-strength reinforced steel has high strength and good delayed advantages.The alien column can improve the indoor space utilization rate.The use of high-strength steel bars in the alien column structure can combine the advantages of the two,which is conducive to the rapid development of alien column structure projects.Due to the particularity of the cross-section of special-shaped columns,their low bearing capacity and weak seismic performance limit their use in seismic regions.Currently,the conclusions drawn from research on the seismic performance of high-strength reinforced concrete special-shaped columns are not yet unified.Therefore,this article studies the seismic performance of high-strength reinforced concrete special-shaped columns using finite element ABAQUS simulation and regression fitting methods,aiming to promote the application of high-strength steel bars above 500 MPa in special-shaped column structures.The specific research work of this article is as follows:(1)Based on the current standardized reinforced concrete base relationship,this article deduced the calculation method of ABAQUS’s built-in concrete plastic damage model damage factor,and established high-strength reinforced concrete concrete,T-shaped and L-shaped columns of the same parameter as the same parameter as the test as the test.The finite element model,and the simulation test of it consistent with the test loading system.Compared with the simulation results and test data,the yield load and limit load error are within 18%,which verify the accuracy of the finite element model.(2)Based on the verified high-strength reinforced concrete concrete and alien finite element models,consider the effects of concrete strength,longitudinal tendon strength,longitudinal tendon with gluten,stirrup strength,volume blending rate,and axial pressure to six factors.Performance,deformation ability,stagnation performance,skeleton curve,rigidity degradation and cumulative energy consumption have been conducted.By analyzing indicators such as the displacement delay coefficient and limit displacement angle,the latency performance of the high-strength reinforced concrete album-shaped column is analyzed,and the actual recommendations of the project are given.(3)Based on the analysis of the finite element variable ginseng,it can be found that when the concrete strength is increased,the capacity of the component can be increased,but it will cause the delays to deteriorate;The impact on the peak intensity is greater than the strength of the longitudinal tendon strength.The ten-shaped pillar,T-shaped pillar and L-shaped column of600 MPa reinforcement are configured.Increase 9.04%,6.24%,and 3.98%,respectively;increasing the strength and volume of the stirrup can increase the bearing capacity and deformation ability of the alien column to a certain extent.The smaller the spacing of the stirryruct Increased voltage ratio,enhanced energy consumption capacity,peak strength increased significantly,and the carrying capacity after peak displacement decreased rapidly.When the axial pressure ratio is 0.2,the ten-shaped column latency coefficient is 3.72,the T-shaped column latency coefficient is 2.52,and the lactated column latency coefficient is 2.29.When the high-strength reinforcement is adopted,the axial pressure ratio at each seismic level should be appropriately reduced.(4)On the basis of simulation tests,the three-fold line model is used to process the test skeleton curve,and the recovery model of high-strength reinforced concrete alien columns is established to give the equation expression at all stages of the unified skeleton curve.The regression method obtains the rigid degradation law of each stage,and is highly involved with the results of the test and simulation.