Research On Soeismic Behavior Of T-Shaped Steel Reinforced Concrete Special-Shaped Columns And Their Frames

The steel reinforced concrete special-shaped column structure is a new type of structural column combining a steel reinforced concrete structure(SRC)and a special-shaped column structure.Such a structure not only can see the advantages of the special-shaped column for effective use of space,but also utilizes the steel-reinforced concrete structure to make up for the insufficiency of structural bearing capacity and ductility,and greatly improves its seismic performance.Has a certain development prospects.In this paper,two kinds of finite element software ABAQUS are used to analyze the seismic behavior of a concrete column and frame system with a T-shaped steel reinforced concrete special-shaped column structure.Through research and analysis,it provides a theoretical basis for practical engineering.This article mainly carried out the following work:In order to study the seismic performance of concrete columns with T-shaped steel reinforced concrete special-shaped column structure,a finite element T-shaped steel reinforced concrete special-shaped column model was established by using ABAQUS finite element software simulation.After modeling and assembling different components,selecting and determining material constitutive relations,setting boundary conditions,applying loads,and performing meshing and other modeling steps,three conditions of different steel thickness,different concrete strength,and different axial compression ratios Next,the main analysis model is hysteretic behavior,stiffness degradation,energy dissipation performance and ductility performance under low-cycle reciprocating loads.The results show that the hysteresis curve is fusiform and full under three conditions,showing good seismic performance.As the concrete grade increases,the ultimate bearing capacity of the test piece is gradually increased,and the initial stiffness of the test piece is larger.When the test piece enters the failure stage,the bearing capacity changes substantially the same.Different concrete grades have little effect on the stiffness degradation of the specimens.The degradation at the beginning is faster and the degradation rate is slow in the later stage.With the increase of the thickness of the steel,the ultimate bearing capacity of the specimens is obviously improved.The reason is due to the steel and concrete.There is a mutual strengthening relationship,that is,the flange and web of the steel bone have a restraining strengthening effect on the concrete,which improves the ultimate compressive strain and compressive strength of the concrete;with the increase of the axial compression ratio,the ultimate bearing capacity of the test piece There is a slight improvement.When the axial compression ratio is too high,the component will accelerate in the stage of decreasing bearing capacity,resulting in accelerated stiffness degradation,poor ductility of the components,and poor seismic performance.In order to investigate the influence of concrete strength on the mechanical behavior of T-shaped steel reinforced concrete columns under eccentric compression,this paper uses ABAQUS software to simulate the force of T-shaped steel reinforced concrete columns under bias,and obtained The load-displacement curves of T-shaped steel reinforced concrete under different eccentricities under different concrete strengths were coMPared and analyzed.The results show that the bearing capacity of the member decreases with the increase of the eccentricity and increases with the increase of the concrete strength.When the eccentricity is small,the concrete strength has a great influence on the bearing capacity of the component.As the eccentricity increases,the influence of the concrete grade on the bearing capacity of the component is weakened.However,regardless of the strength of the concrete,the influence of the eccentricity on the bearing capacity of the member is basically unchanged.Finally,the finite element analysis of the frame is carried out by MIDAS/Gen software,and the seismic performance of the frame is very good in the case of multiple earthquakes.In the rare earthquake,the maximum interlayer displacement and the maximum interlayer displacement angle appear in the 2 layer position.The results still meet the specifications.