Tests on inclined, tapered and STS concrete-filled steel tubular (CFST) stub columns

Tests on stub stainless steel–concrete–carbon steel double-skin tubular (DST) columns

“…For the square DST columns, the outward local buckling occurred near the top plate. These phenomena are similar to the tapered CFST columns as well [15]. Fig.…”

“…The buckling sections for inclined specimens are approximately perpendicular to the longitudinal direction. This phenomenon of the outer steel tube is similar to the inclined CFST column [15]. For the hollow section columns without filling concrete, both inward and outward buckling were observed on the outer stainless steel tube, and the outward buckling area is larger than that of the concrete-filled one.…”

“…(3) Loading procedure Similar to Han et al [15], the ''stub column'' for the straight, inclined and tapered columns is defined as: the maximum section width or diameter to the total height ratio equal to 1/3. Fig.…”

“…The vertical load (N v ) applied thus can be decomposed into the horizontal force (N h ) and the longitudinal force. This model is taken as a half length of the column with combined forces of bending, compressing and shearing at both ends of the column in a non-sway structure (Han et al [15]). The vertical load (N v ) applied on the top and the horizontal reaction force (N h ) for the inclined column were recorded during the test by a pressure sensor.…”

“…It is believed that the inclined and tapered columns can bring special spatial experience in the structure, and they may serve as the load transfer members in some particular structure. Han et al [15] studied the behavior of the inclined, tapered and straight-tapered-straight (STS) CFST stub columns, and it was found that these composite columns behaved in a very ductile manner. The test results were analyzed and the measured ultimate strength was compared with predicted results using several codes on CFST stub columns.…”