Study On Mechanical Performance Of High Strength Concrete-filled Stainless/mild Double Steel Tubular Column Under Axial Compression

High strength concrete-filled stainless/mild double steel tubular column studied in this paper is a complex type of concrete-filled steel tube column in which the stainless steel tube and the mild steel tube are put with one heart and the concrete is simultaneously placed into the mild steel tube and the middle layer part between the stainless steel tube and the mild steel tube.In this paper,we use the method of experimental study、numerical simulation and analysis method to study the axial compression load of high strength concrete-filled stainless/mild double steel tubular column. The main research contents are as follows:1) The load-displacement curve and the failure form are given by the axial compression test of the seven high strength concrete-filled stainless/mild double steel tubular columns. We can conclude that the load-carrying capacity of specimens increase with the inner steel pipe diameter increase, with the inner steel wall thickness increase, with the strength of concrete increase and with the ring to stress increase. At the same time we get that the load-carrying capacity of the high strength concrete-filled stainless/mild double steel tubular column is greater than the single high strength concrete-filled stainless steel tube column.2) Introduce the exited load-carrying capacity formulas of the concrete-filled steel tube column. Get the load-carrying capacity formula of high strength concrete-filled stainless/mild double steel tubular column by modify the exited formula.3) On the basis of the experiment, the whole process of the ABAQUS numerical analysis about the high strength concrete-filled stainless/mild double steel tubular column is given. At the same time the correctness of the model is proved by the compression.4) A nonlinear finite element model was developed to study the feasibility about using high strength concrete-filled stainless/mild double steel tubular column replace the single high strength concrete-filled stainless steel tube column. The result indicate the idea is feasibly.