Experimental Study On Axial Compressive Behavior Of Spatial Steel Frame Concrete Short Column With Inner Square Tubes

With the continuous emergence of tall building structure,higher requirements for bearing capacity and ductility of structural columns are put forward.In this paper,a new type of composite column is proposed,namely,the concrete short column of spatial steel frame concrete column with inner square steel pipe,which makes the concrete change from single constraint to space steel frame and square steel pipe to its double constraint.In order to explore the mechanical properties of the spatial steel frame concrete axial compression column embedded steel tubular,five spatial steel frame concrete short columns with inner square steel tubes were studied,and analyzed by using finite element method,The main influencing factors of the bearing capacity of this new type of composite column are investigated and the calculation formula of the axial compression bearing capacity of the concrete short column of the steel frame is pushed.In this experiment,the design parameters were designed for the design parameters such as the length of the Angle steel,the net distance of the fixed bar,whether the internal steel bone was embedded,and the short column specimens of the concrete short column and the short column of the steel frame of 1 space steel frame were designed.The axial compression test was carried out.By analyzing the load-longitudinal strain curve,load-transverse strain curve,load-main strain curve and the influence of each parameter change on load.The experimental results show that the axial compression bearing capacity of the concrete short column of the embedded steel tube space can be improved by increasing the length of the Angle steel and reducing the net distance of the embedded steel.Finite element software ABAQUS was used to establish the nonlinear finite element model of spatial steel frame concrete short column with inner square tubes.The simulation results of the five specimens in this paper show that the finite element calculation value and the test value are more consistent,which can be used to simulate the mechanical properties of the axial compressive behavior of Spatial steel Frame Concrete Short column with inner Square Tubes.On this basis,the article with Angle steel limb length,compose the interval,square steel tube in broad ratio,strength grade of concrete and steel 13 finite element models are designed for the design parameters,the modeling analysis shows that the Angle of limb length increase,compose a clear distance decrease,square steel tube generous than increase and improve the strength grade of concrete and steel,etc all can improve the bearing capacity of a new type of composite column.Based on experimental study and theoretical analysis,this paper puts forward one kind of embedded spatial steel frame concrete short column with inner square tubes axial compression bearing capacity calculation method,The analysis shows that the calculated result is accordance with the test results,which can be used to calculate the axial compression bearing capacity of composite column.