Abstract
The compressive behaviour of column members can be considerably affected by local buckling, material yielding and local end conditions. In this paper, the effects of the loading conditions at the ends of plain channel section columns subjected to uniformly compressed loading, and fixed conditions at the column ends with respect to global rotations, was examined. Finite element simulation was employed to look at the post-buckled response of thin-walled, plain channel section columns that covered the complete loading history of the compression columns from the onset of elastic local buckling through the nonlinear elastic and elastoplastic post-buckling phases of behaviour to final collapse and unloading. Two types of loading conditions were considered: the first was one that has been used practically in tests whereby one end is loaded with a moving top platen while the other end is fixed at the lower platen, but, for the second loading condition, both ends were loaded with equally moving top and lower platens. These two conditions were shown to lead to quite different characteristic interactive responses of the columns due to mode jumping in the buckling mode for the locally rotationally constrained case.
Highlights
There are many aspects which influence the carrying capacity of thin-walled sections; material yielding can be the cause of failure for thin-walled, short length sections
The influence of local buckling and material yielding on the struts was studied by Yidris et al [1,2] and Loughlan et al [3,4] for the case of plain channel, I- and box-section struts using the finite element post-local buckling procedure
Loughlan et al [3,4] gave insight into the effects of local buckling on the compression of I- and box-section struts and the growth of material yielding from the point of the first yield through the nonlinear elastoplastic post-buckling phase of behaviour to final collapse at zero compressional stiffness and the subsequent unloading phase of behaviour
Summary
There are many aspects which influence the carrying capacity of thin-walled sections; material yielding can be the cause of failure for thin-walled, short length sections. Loughlan et al [3,4] gave insight into the effects of local buckling on the compression of I- and box-section struts and the growth of material yielding from the point of the first yield through the nonlinear elastoplastic post-buckling phase of behaviour to final collapse at zero compressional stiffness and the subsequent unloading phase of behaviour In these works, it has been shown that the compressional stiffness of the struts is noticeably reduced at the instant of local buckling. The numerical simulations took into account the influence of material yielding on the yielding on the compressive failures of the sections; study to the compressive ultimate failuresultimate of the sections; the study was the limited towas the limited interaction of interaction of local buckling and overall flexural bending.
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