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Interaction buckling phenomena in thin-walled structures

Summary

This research looks at the interaction buckling phenomena in thin-walled structures.

Supervisor

Professor Kim Rasmussen.

Research location

Civil Engineering

Program type

N/A

Synopsis

Considerable effort has been devoted to characterising the overall buckling behaviour of locally buckled structural members. Using a rigorous bifurcation theory the effect of local buckling is accounted for by calculating the instantaneous stiffness at increasing levels of loading. The stiffness terms include axial, flexural and warping terms and lead to a wider range of coupling phenomena than in the case of non-locally buckled sections. Among other results, it is shown that local buckling can change the critical overall buckling mode of a channel section from a flexural-torsional to a flexural mode. Similarly, local buckling causes the overall buckling mode of a Z-section to change from a minor axis flexural buckling mode to a bi-axial buckling mode.

The research has focussed on columns, beams and beam-columns. The buckling behaviours of point symmetric sections, such as Z-sections, singly symmetric sections, such as channel sections, and doubly symmetric sections, such as I-sections, have been categorised. Column tests have been performed on Z-sections and channels sections to validate the theory.

The project is supported by the University of Sydney Research & Development scheme.

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Opportunity ID

The opportunity ID for this research opportunity is 413

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