Uniaxial Eccentric-Compression Performance Analysis for Double-Plate Connected Concrete-Filled Steel-Tube Composite Columns

Abstract

In this study, five double-plate connected concrete-filled steel tube (CFST) composite columns were tested under a uniaxial eccentric compressive load. The test phenomena, load–axial displacement curves, strain analyses, and column curve analyses were examined. The effects of different eccentricities and loading directions were compared with respect to the double-plate connected CFST composite columns under uniaxial eccentric compressive load. ABAQUS 6.14-4 software was used to develop models of the double-plate connected CFST composite columns. Load–axial displacement curves and failure modes obtained from the finite element analysis (FEA) models and tests were compared in this study. The FEA results, which were in good agreement with the test results, can well simulate the uniaxial eccentric compression performance of double-plate connected CFST composite columns. Based on the superposition principle and calculation method of the slenderness ratio as per the Standard for Design of Steel Structures (GB50017-2017), the authors proposed a formula for the stable bearing capacity of the double-plate connected CFST composite columns. In addition, a new theoretical formula for the bearing capacity of the uniaxial eccentric compression specimen was proposed. A comparison between the calculated N–M correlation curves and the test and FEA results indicated that the calculation results exhibited good safety and can provide ideas for engineering design.