Finite Element Simulation Of A New Type Of Inclined Column Transfer Structure

Inclined column conversion is becoming more and more widely used in framesupported shear walls and frame-supported short-leg shear walls.A series of studies have been done at home and abroad for its mechanical properties.Research from Chongqing University has shown that when a reinforced concrete inclined column conversion structure is used in a frame-supported shear wall,its seismic performance is poor.Under the low-cycle reciprocating load,the plastic damage of the structure is more serious,and the energy dissipation ability is poor,which is not as good as the beam-type conversion structure.In order to improve the energy dissipation capacity of the structure,so that it can be more widely used in building structures,the research group proposed to improve the seismic performance by implanting section steel in the inclined columns and conversion beams.Aiming at this new type of inclined column conversion structure,the research team conducted a series of specific analysis.This includes a large number of finite element simulations and three sets of 6:1 scale models with different axial compression ratios for horizontal reciprocating loading tests.Previous finite element simulations have not considered the bond-slip between steel and concrete.Based on the previous research,this paper refers to the most widely used steel-concrete bond-slip model for static loading simulation of this structure in the finite element software,and low-cycle horizontal reset loading simulation,as well as the establishment and test specimens.The 1:1 model compares the simulation results with the experiment.In this paper,a total of 15 ABAQUS finite element models were made in 9 groups,with six static loadings,six low-return loadings,and three experimental finite element models.The six models for static loading have three axial compression ratios,and each axial compression ratio has two models,one of which ignores the bond-slip between steel and concrete.Another model hollowed out the concrete part of the slanted columns and conversion beams implanted with steel profiles,and simulated the bond-slip between the concrete and the steel profiles by nonlinear springs.The same is true for the low-cycle horizontal reciprocating model.The control group ignores the bond slip between the steel and concrete,and the test group simulates the bond between the steel and concrete by establishing a nonlinear spring.The simulation results of the two models are compared with the experimental results.The research shows that under static loading,the model considering steel-concrete bond slip has a more obvious drop in load-displacement curve than the model ignoring bond slip,which is more in line with the actual situation.Under the low-cycle reciprocating load,the model considering the steel-concrete bond slip is slightly worse than the model ignoring the bond slip,and the hysteresis loop is fuller and the bearing capacity is lower,indicating that its energy dissipation capability is poor.The simulation results agree well with the experiment,indicating that this simulation method has good practicability,and this method can be applied in actual engineering for simulation.