The global stability of axially compressed columns are examined in the context of structural applications involving energy absorbing (crush capacity) and load supporting (strength capacity) elements. Plate type box columns of rectangular cross section are shown to collapse under axial compression, predominantly in a global bending mode, considerably lower in dissipation energy content than the uniform axial collapse. The stability of axial collapse of a crushing column is shown to depend on the mode of collapse, which is related to 'compactness' of the section. Two modes are identified and defined analytically. After the Euler buckling formulation is modified to reflect the reduction in section properties (stiffness) due to local collapse, it provides the failure criterion for the global stability of the column in the post buckling regime and during folding collapse. The effects of section geometry, material properties, size of folds and critical length on column stability are presented in the form of design charts and correlated with test data.
Stability of plate-type box columns under crush loading
Stabilitaet von Rechteckrohren bei axialer Stosslast
1982
17 Seiten, 9 Bilder, 2 Tabellen, 12 Quellen
Aufsatz (Konferenz)
Englisch
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