Study On Mechanical Properties Of Concrete-filled Steel Tubular Composite Column-reinforced Concrete Beam Joints

Concrete-filled steel tubular composite column is a new type of building structural component independently developed in China.It has better compressive and seismic performance than reinforced concrete column and steel reinforced concrete column.Now composite column node study is less,commonly used node has ring beam,steel bracket and the steel plate fin type conversion connection methods,such as,but the use of the node has more limitations,based on this the paper according to the existing of a project as the background put forward a new kind of steel pipe wear reinforcement node connection mode.In this paper,ABAQUS is used to study the mechanical properties of such joints.The main results are as follows:(1)Considering the material constitutive,concrete damage and steel tube and concrete contact,the contact relationship of longitudinal reinforcement and concrete,etc.To establish the finite element model,and use the other literature test data validation research idea of this article,through the simulation calculation data compared with the experimental data found that theoretical results fit well with the data of the two,guarantee the accuracy of the research ideas in this paper.Based on this,this article for the node to open hole and strengthening measures respectively ten model was established,the concrete filled steel tube composite column and concrete is obtained by computing the axial displacement of beam section curve and stress nephogram of each material,in view of the bearing capacity of force-displacement curve stress nephogram and composite column is analyzed by different methods of opening and strengthen the combination effect of the lord.Determine the opening 600×900and 600×100 and somehow the stiffening plate of better ways of opening,finally analyzes the force performance of two nodes,and through comparing the steel tube,concrete and steel under different displacement,such as the stress nephogram of 600×900 and somehow the node plate press on the best effect.(2)According to obtain the optimal opening and strengthen the loading way,the seismic performance analysis,through the hysteresis curve,skeleton curve,stiffness degradation curve,and accumulated energy dissipation-relative displacement curve analysis showed that steel pipe wear reinforcement node has good seismic performance,in addition to use the same reinforcement to establish the corresponding ring beam node will wear the seismic behavior of the two kinds of node is concluded it has good seismic performance.Finally,the stress state of the joints under reciprocating load is deeply analyzed,and it is concluded that the joints have good strength and can meet the principle of strong joints and weak components.