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Theoretical analysis and experimental study on normal cross-section load-carrying capacity for concrete-filled double steel tubular short columns subjected to axial compression load

JIANG Han1,3,CHU Liangcheng2,ZUO Jiang3,CHENG Wenrang1(1.School of Civil Engineering,Southeast University,Nanjing 210096,China;2.Suzhou Jinri Real Estate Co.Ltd,Suzhou 215021,China;3.Nanjing Architectural Design and Research Institute Co.Ltd,Nanjing 210005,China)  
This paper studies the normal cross-section load-carrying capacity for the concrete-filled double steel tubular short columns subjected to axial compression load in which the inner and outer circle steel tubes are placed with the same circle center.The working mechanics of the concrete-filled single steel tubular and double steel tubular short columns are analyzed based on the fiber model method and the suitable constitutive relationship.The paper provides the load-displacement numerical analysis and the calculation formula of load-carrying capacity for the concrete-filled double steel tubular short columns subjected to axial compression load.The specimens of concrete-filled double steel tubular short columns subjected to axial compression load were tested and compared favorably with proposed analytical method.Both analysis and test showed that the concrete filled double steel tubes subjected to axial compression load behaved similarly as conventional concrete filled tube,with the elastic stage,elastic-plastic stage and failure stage.The failure pattern of the concrete filled double steel tubular short column exhibited mid-height drum shape.The working performance of its outer layer concrete is approximately the same as that in concrete-filled steel tubular short column,but the confinement effect to the concrete in the inner steel tube is larger.Comparing with the concrete-filled steel tubular short columns,the load-carrying capacity,ductility and integral property of the concrete-filled-double steel tubular short columns are better.
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