The behavior of thin-walled dodecagonal section double skin concrete-filled steel tubes
under bending was studied in this paper. Both experimental investigation and finite element
analysis (FEA) were carried out. A total of 7 specimens were tested with the beam length of
2000 mm. The width to thickness ratio of the outer steel tube ranged from 75 to 133. The
load–displacement curves, failure mode and ultimate capacity of test specimens were
obtained. A finite element model was developed for the thin-walled dodecagonal section …

The behavior of thin-walled dodecagonal section double skin concrete-filled steel tubular
beam-columns was investigated in this paper. A series of tests were carried out on
specimens having the length of 2000 mm. Both outer and inner tubes of test specimens were
cold-formed steel dodecagonal hollow sections (DHS). The diameters of outer and inner
steel tubes of test specimens were 400 mm and 240 mm, respectively. Each test specimen
was tested to failure, and the behavior under loading was recorded. Finite element model …