Study On Tensile Properties Of Steel Reinforced Concrete Columns

With the development of the construction industry,people are getting more and more demands on buildings.Buildings are moving toward the beautiful,multi function,large span,high-rise,super high-rise.In order to meet these requirements,the cost of building and the seismic performance must be considered.Although the traditional reinforced concrete structure cost is low,it is so heavy that the seismic performance is poor.The seismic performance of steel structure is good,but the corrosion resistance is poor.The steel reinforced concrete structure has the advantages of high bearing capacity,high rigidity,small section size,good fire resistance and corrosion resistance,good ductility and energy dissipation,etc.,which can meet the needs of various occasions.Steel reinforced concrete members are widely used in buildings.In these steel reinforced concrete components,the tension members slowly appear in front of us.For example,corner column and side column of the building,eccentric tension column in the double columns of industrial building,the bottom chord of truss type steel reinforced concrete in tension.At home and abroad,there is not much research on the tension steel reinforced concrete members.In view of this,this paper studies the tensile properties of steel reinforced concrete members.In this paper,the design and manufacture of the test component,the scheme of the experiment,the arrangement of the equipment and the experimental phenomena are described in detail.The test results are analyzed.The influences of steel web thickness,flange thickness,steel ratio,eccentricity and reinforcement ratio on the bearing capacity,lateral deflection and crack of the member are analyzed in detail,and the related reasons are also pointed out.The load displacement curves,the load strain curves of the steel flanges and the load strain curves of rebars are drawn,and the problems reflected in the curves are analyzed in detail.The stress and deformation of the component are analyzed by ANSYS,the load displacement curve of ANSYS can reflect the changing trend of the test component,and the yield load of simulation result is very close to the test value.The bearing capacity formula is proposed in this paper,which is based on the failure mode of tensile column.In order to improve the accuracy of the formula,the axial columns set a reinforced contact coefficientα to characterize the contribution of the steel bar to the bearing capacity of the members after yielding.And the contribution of concrete to the bearing capacity of the components is discussed.Eccentric tension columns still comply with the provisions of the axial tension columns for the rebars and concrete.For eccentric tension columns,the steel tension reduction factor β is also set.If the tension in the flank of the axial force isσ,the force on the other side of the flange will be reduced to β ?σ.This paper also discusses the two types of tension reduction factor β.In this paper,the lateral deflection and crack of steel reinforced concrete columns are studied.Some parts of the formulas are assumed and modified so that they can be applied to the calculation of the tensile column.By comparing the test results with the calculations,we can see that the applicability of the formulas listed in this paper is good.