Structure Performance of Cold-formed Steel columns reinforced by Channel Sleeve under Axial and Eccentric compression
Schafer, Benjamin W.
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Due to the weak torsional stiffness of cold-formed thin-walled channel members, distortional buckling behavior maybe controlled the ultimate load-capacity under certain conditions. Therefore, a new section reinforced by Channel Sleeve is proposed in order to improve the structural capacity of channel columns in this paper and is performed on the axial and eccentric compression tests. The influence of Channel Sleeve spacing on the bearing capacity and failure mode is studied, and the beneficial effect of the Channel Sleeve on the bearing capacity is verified. First, the corresponding numerical modeling of the experiments is presented in detail by describing the numerical models, types of finite elements and methods of analyses. Second, the reinforced cold-formed steel members were subjected to axial and eccentric compression analysis. Next, the magnitude, direction of eccentricity and the sleeve position are varied, in order to address their effect on the columns' capacity and structural behavior. In addition, the numerical model is used to analyze the parameters such as the slenderness ratio of the specimen, the magnitude and direction of eccentricity. The influence of these parameter changes on the structural performance of the members under the action of axial and beam-column compression members is obtained. Finally, compare the bearing capacity of the axial compression specimen with the bearing capacity calculated by the North American Code.