Numerical Simulation And Research Of Reinforced Concrete Disintegrated Column

In recent years,along with economic development,high-rise buildings have been widely used.In order to adapt to the construction of modern cities,reduce the area of land and meet the needs of use,the higher the building floor,the inevitable formation of short columns.In the face of the contradiction between the strong popular trend of high-rise buildings and short columns,it is an urgent problem to improve the seismic performance of short columns while ensuring the bearing capacity of short columns.In this paper,the structural design method of reinforced concrete disintegrated column is put forward:the internal design of short column adopts separate reinforcement scheme,each small column is reinforced independently,and the test piece is poured as a whole.A certain depth of guiding crack is prefabricated at the position of equal section.Under the action of load,when the bearing capacity of the column reaches the limit load,the cracks will continue to expand in the direction of guiding cracks,and finally the columns will be disintegrated.After disintegration,the columns are divided into several pre-set small columns,which are no longer short columns,and belong to the state of large eccentric compression,and become brittle failure to ductile failure.In order to study the seismic behavior of the disassembled columns,the finite element analysis software ABAQUS is used in this paper(1)Based on the existing literature,this paper studies the bearing system of short columns and summarizes three kinds of measures to solve the brittle failure of short columns.This paper expounds the advantages of the split column in improving the performance of the short column,and puts forward the design method of the reinforced concrete split column in view of the defects of the split column technology,such as the difficulty in making the diaphragm.(2)Using ABAQUS modeling,the paper selects the constitutive relation of reinforced and concrete which is suitable for the research content of this paper,introduces the modeling process of reinforced concrete disintegrated column in detail,on this basis,carries on the finite element analysis to the whole column,the separated column and the disintegrated column,through the analysis result,compares the failure form,the ductility performance and the bearing capacity of the three kinds of columns,obtains that the disintegrated column is improving the short column property Advantages in energy.(3)The influence of different axial compression ratio,prefabricated joint depth and stirrup method on the seismic performance of the disassembled reinforced concrete columns is studied by numerical simulation.The hysteretic curve,skeleton curve,ductility performance,stiffness degradation and energy consumption are obtained under different influence factors.The results show that the composite of a small amount of stirrups in the middle of the disassembled column can not only alleviate the sudden disintegration of the column,but also enhance the bearing capacity of the disassembled column and improve the ductility of the short column.With the increase of axial pressure ratio,the ductility of disassembled column is worse.Therefore,the axial pressure ratio should be strictly controlled in seismic design.On the basis of other factors,the greater the depth of the prefabricated joint is,the worse the seismic performance of the disassembled column is.Considering the relationship between the axial compression ratio and the depth of the prefabricated joint,in the case of small axial compression ratio,when the depth of the prefabricated joint is set,in order to ensure the occurrence of the disintegration of the disassembled column,the depth of the prefabricated joint can be increased appropriately,while the impact on the bearing capacity is not obvious.