Research On The Behaviors Of Cold-formed Thin-walled Square Steel Tubes Filled With Concrete To Compression-bending

Cold-formed thin-walled square steel tubes filled with thecore concrete composite column is analyzed by ANSYS,in orderto research on the collaborative work ability of the thin-walledsquare steel tubes and the core concrete in bias load; theinfluence eccentricity, the strength of the core concrete,slenderness ratio and steel pipe thickness made on the Bearingcapacity of cold-formed thin-walled square steel tubes filledwith the core concrete composite column to compression-bending. The analysis results show: the cold-formed thin-walledsquare steel tubes and the core concrete can work together verywell; Along with the increase of eccentricity, column limitbearing capacity decreases, but its deformation capacityimproves; Along with the increase of the strength of concreteand steel pipe thickness, the ultimate bearing capacity improves;Along with the increase of slenderness ratios, column limit bearing capacity decreases, but its deformation capabilityimproves.The formula is derived from the analysis of large sampleson the basis of DBJ13-51-2000,which applies to the Bearingcapacity of cold-formed thin-walled square steel tubes filledwith the core concrete composite column to compression-bending when its b/t is larger than60.