Research on Mechanical Properties of Concrete-Filled Double-Skin Circular Steel Tubular Columns Stiffened by Perforated Steel Plates Under Axial Compression
The mechanical properties of concrete-filled double-skin steel tubular columns stiffened with per-forated steel plates was studied.The finite element model was established by ABAQUS software.On the ba-sis of verifying the reliability of the model,the load-displacement curve,stress distribution,failure mode and parameter analysis of the members were carried out.Furthermore,the design method of bearing capaci-ty of concrete-filled double-skin steel tubular columns stiffened by perforated steel plates under axial com-pression was proposed.The results showed that the perforated steel plate could enhance the joint force and restraint effect of steel tube and concrete.The recommended values of each parameter of the component should be:steel grade Q355,concrete strength grade C60,opening diameter 35 mm,opening spacing 15 mm,stiffened steel plate thickness 5 mm,and the number of stiffened steel plates should be 4,at this time,the bearing capacity could be increased by 9.6％compared with the concrete-filled double-skin steel tube column,and the bearing capacity is only reduced by 1.9％compared with the bearing capacity of the concrete-filled double-skin steel tube column stiffened with steel plates.Therefore,the opening could save steel and ensure a certain bearing capacity.By adding the contribution of the bearing capacity of the stiffened steel plate to the calculation formula in the specification,and considering the influence of the opening diame-ter on the bearing capacity and the effect of the steel plate on the improvement of the concrete strength,the proposed design method of axial bearing capacity could safely predict its axial bearing capacity.
perforated steel plateconcrete-filled double-skin steel tubular columnmechanical propertiesfinite element analysis
NETL
NSTL
万方数据
