Performance of Bolt-Welded CFST Short Columns with Different Initial Imperfections: Experimental and Numerical Studies

Gap between the steel tube and core concrete of Concrete-Filled Steel Tube (CFST) members is regarded as an initial imperfection, which may exist in CFST arch bridge due to construction process problems. In this paper, based on design scheme bolt-welded joints rib columns extra-long span bridge, effects two types imperfections, interfacial gap spherical-cap gap, mechanical properties Bolt-Welded (BWCFST) short column under axial compression were investigated. Axial tests conducted three specimens with one normal specimen without imperfection. A Finite Element Analysis (FEA) model was developed further investigate behavior BWCFST columns, validated by experiment.