A large-scale experimental program has recently been conducted on twelve concrete-filled light gauge steel composite columns, with the objective to quantify the axial load strength capacity. Currently, there is a lack of guidance for such structural elements. This system of construction (Mur-Tec Systems) is a novel forming system where structural beams and columns are placed in the cavities of prefabricated light gauge steel modular stud walls. The parameters investigated include column cross section size, length and cross section profile designated as A and B. The parameters investigated were representative of one-storey, full-scale construction. All columns were subjected to concentric axial loading in the horizontal position using two or three 1400-kN servo-hydraulic actuators. The test results illustrated that load capacity of the composite columns was proportional to the cross section. In addition, the measured compression shortening of the columns was proportional to the column length. In general, the columns with cross section profile B sustained higher load and greater compression shortening than those with profile A. All columns failed due to end bearing failure, including crushing of the concrete and local side wall buckling of the light gauge steel. The axial compression strength capacity of the concrete-filled light gauge steel columns was satisfactorily predicted based on end bearing resistance as the limiting state according to Canadian Standards Association Standard A23.3-04 Design of Concrete Structures including the contribution of the light gauge steel. The calculated to measured axial strength capacity was 0.93.
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