Performance and Numerical Analysis of Eccentrically-Loaded Concrete-Filled Double-Skin Elliptical Steel Tubular Short Columns
To study the performance of eccentrically-loaded concrete-filled double-skin elliptical steel tubu-lar(CFDEST)short columns,the paper designed and carried out nine eccentric tests on CFDEST short col-umns,and established a refined numerical analysis model for CFDEST short columns considering elliptical cross-section characteristics.This model incorporated various factors such as eccentricity,hollow ratio,thickness ratio,and aspect ratio,elucidating their influence on the bearing capacity and ductility.Further-more,it revealed the typical failure modes of CFDEST short columns under eccentric loading.The results showed that the failure modes of CFDEST short columns under eccentric compression include radial bulging of the compression-side outer steel tube,tension yielding of the tension-side outer steel tube,localized in-ward deformation of the inner steel tube,and concrete crushing failure.Additionally,the eccentric bearing capacity of these columns increased with the decrease of eccentricity,hollow ratio,and thickness ratio,as well as with the increase in steel and concrete strengths.
double-skinconcrete-filled elliptical steel tubeeccentric compression testfinite element a-nalysisfailure mode
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