Concrete-filled and bare 6082-T6 aluminium alloy tubes under in-plane bending: Experiments, finite element analysis and design recommendations

Flexural buckling behaviour of concrete-filled double skin aluminium alloy columns

“…It can be observed from the figure that a certain ductility is visible in all curves, attributed to the beneficial composite action of the three elements of the CFDSAT specimens. The ultimate load (N u,Test ) of all specimens determined from the tests is listed in Table 4 including their critical buckling load (N cr ) (see Equation (9) in Section 5.1). It is found from the table that the ultimate load of the CFDSAT specimens improved noticeably by increasing the dimensions of outer tube when the dimensions of inner tube are constant.…”

“…The N cr denotes the critical buckling load or Euler's critical load, which is defined by Equation (9). where EI e represents the effective flexural rigidity of the composite section, which is calculated by Equation (10).…”

“…Hence, the use of aluminium alloy tubes in the concrete-filled double skin sections can further reduce their weight significantly and enhance their resilience. On the other hand, the structural stability of aluminium alloy hollow sections can improve remarkably by incorporating the concrete infill [7][8][9]. Therefore, by combining the effectiveness of double skin technique and the profound features of aluminium alloys, a concrete-filled double skin aluminium alloy tubular (CFDSAT) column can be an efficient structural member for structures located in aggressive environments, such as offshore wind turbines, offshore oil platforms, seaside piers, containment building of nuclear power plants, tall buildings and bridges in earthquake-prone regions.…”

Flexural behaviour of concrete-filled double skin aluminium alloy tubes

“…The load was applied using two rollers with a displacement-controlled rate of 1.5 mm/min. At the loading points, steel plates were employed for the square specimens [9] and half-circle steel blocks were used for the circular specimens to avoid any localised failure due to load concentration [1]. During the tests, three 50 mm-stroke linear variable displacement transducers (LVDTs) were applied to record the vertical movement of the specimens, among them one was placed at mid-length and two were positioned under the loading points.…”

“…Thus, aluminium alloys can be used for the outer and inner profiles of concrete-filled double skin tubular structural members to improve their sustainability and resilience. In addition, past research showed that the composite action of aluminium alloys and concrete can improve aluminium's stability performance [7][8][9][10][11].…”