Optimization Design Of Section Size About Circular RC Column Strengthened With Self-compacting Concrete And Square Steel Jackte

With the development of society,the reinforced concrete structures constructed in China in early years are facing the dilemma of “overhaul” due to environmental erosion,construction defects,man-made damage,etc.It is extremely urgent to find a way of reinforcement that is both economical and safe.Concrete filled steel tube,due to its good mechanical properties,has been widely used as major force support elements in recent years.In view of the fact thatordinary concrete is difficult to vibrate and compact,affecting the structural performance of the structure,in the analysis of research status in related fields at home and abroad,and fully considering the actual needs of the project,this paper creatively proposes the method of reinforcing the RC column With self-compacting concrete and square steel jacketThe axial and eccentric behavior of strengthened columns were investigated through experiment.To actively respond to the call of the national resource-saving society,using MATLAB software to optimize the cross-sectional size of thecomposite reinforced column.The research content of this paper includes the following aspects:(1)The RC cylindrical axial compression and eccentric compression tests are carried out by square steel tube self-compacting concrete,and the hoop rate and section size are analyzed for the failure mode,ultimate bearing capacity,load-displacement curve,relative load-strain curve and load of the combined reinforcement column.The lateral deflection curve is affected by the force performance.The research shows that the ultimate bearing capacity,axial compression stiffness and ductility of the specimens after reinforcement are greatly improved.In the short column axial compression test,the section dimensions are certain,and the axial compression stiffness of the specimens is basically the same,with the hoop rate.when the hoop rate is constant,the section size is increased,and the ultimate bearing capacity of the test piece is increased.The improvement is obvious,but the restraining effect of the outer steel tube on the core concrete is also weakened,which is more steep in the descending section and the ductility is reduced.Compared with the axial compression short column,the ultimate bearing capacity and ductility are reduced due to the influence of the second-order bending moment caused by the eccentric load and the initial defect in the biased short column and the axially compressed long column specimen,but compared with the same Under the condition of the RC cylinder,the force performance has been greatly improved.(2)Based on the experimental analysis,combined with the characteristics of axial compression of RC short column strengthened by square steel tube self-compacting concrete,the calculation formula of ultimate bearing capacity applicable to the test pieces was derived.On the basis of this,the biasing capacity reduction coefficient and the stability reduction factor are introduced,and the calculation formulas of the combined reinforcement short column bias and the medium and long column axial bearing capacity are established.The calculated values of each group are compared with the test results.And the bearing capacity formula suitable for the test piece of this test was derived.(3)In the paper,the RC cylinder test of square steel tube self-compacting concrete is carried out.At the same time,based on the optimization design theory,the bearing capacity formula established by experiment is adopted,and the lowest cost is the goal pursued,which meets the design theory and related specifications.Under those premise,the cross-section dimension optimization design of the self-compacting concrete reinforced RC column is carried out.By comparing the typical test pieces,the cost of the test piece is reduced and the cost is reduced,which proves the effectiveness of the optimized design procedure.(4)Based on the previous optimization program research,this chapter also uses MATLAB-assisted visual design tool GUI to optimize the visual programming strengthened columns.The GUI working interface and creation steps are introduced.Through the preparation of the previous program and the visual design of the GUI,the research on the cross-sectional dimensions of the combined reinforcement short column no longer requires artificial judgment of the loading mode of the combined reinforcement column and the structural size of the test piece.The program can judge and optimize the section by itself and output the corresponding parameter results as needed.This chapter is a preliminary exploration of the cross-section optimization of the self-compacting concrete composite columns and other similar structures,and strives to make the optimization design process more simple and humanized,which can be used for reference in related research.