Finite element analysis of axial compression performance of concrete-filled double skin steel tube
In order to build a numerical analysis model for a hollow concrete-filled double steel tube(CFDST)component with proven axial compression performance,the axial compression test for a concrete-filled steel tube column,the rate of the hollow steel tube wall thickness,and sandwich concrete compressive strength parameters on the hollow interlayer steel pipe concrete component were all taken into consideration.The research findings show that,within the parameter range,the axial compressive ultimate bearing capacity decreases with a decrease in the length to diameter ratio but increases with an increase in the steel tube wall thickness,sandwich concrete strength,and hollow ratio.The axial compression bearing capacity increases from 2.9％to 3.7％for every mm increase in the steel's inner wall thick-ness,giving the bearing capacity a growth factor of roughly 0.7％.Additionally,increasing the concrete strength from C40 to C90 results in an increase in the axial compression bearing capacity of 68％for circular cross-section specimens and 53％for square-section specimens.Additionally,the axial compressive ultimate bearing capacity increases from 3.4％to 8.7％for every 0.1 increase in the hollow ratio,with a corresponding decrease in the bearing capacity growth coefficient of about 5％.Additionally,the bearing capacity of circular cross-section specimens decreases by 3％when the length to diameter ratio is increased from 2.2 to 7.2,whereas the bearing capacity of square cross-sec-tion specimens decreases by 10％when the ratio is increased from 2.2 to 5.7.It is important to note that compared to the hollow ratio,steel tube wall thickness,and concrete strength,the aspect ratio has a much smaller impact on the final bearing capacity of the components.Ad-ditionally,a higher length-to-diameter ratio of the specimens results in a lower peak capacity but a higher bearing capacity at the peak dis-placement,suggesting improved member ductility.The bearing capacity of concrete-filled steel tubes and the ductility performance of the specimens are increased along with an improvement in concrete strength's bearing capacity and peak displacement.
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