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http://dx.doi.org/10.12989/sem.2014.51.6.1017

Improving buckling response of the square steel tube by using steel foam  

Moradi, Mohammadreza (Department of Civil and Environmental Engineering, Old Dominion University)
Arwade, Sanjay R. (Department of Civil and Environmental Engineering, University of Massachusetts)
Publication Information
Structural Engineering and Mechanics / v.51, no.6, 2014 , pp. 1017-1036 More about this Journal
Abstract
Steel tubes have an efficient shape with large second moment of inertia relative to their light weight. One of the main problems of these members is their low buckling resistance caused from having thin walls. In this study, steel foams with high strength over weight ratio is used to fill the steel tube to beneficially modify the response of steel tubes. The linear eigenvalue and plastic collapse FE analysis is done on steel foam filled tube under pure compression and three point bending simulation. It is shown that steel foam improves the maximum strength and the ability of energy absorption of the steel tubes significantly. Different configurations with different volume of steel foam and composite behavior is investigated. It is demonstrated that there are some optimum configurations with more efficient behavior. If composite action between steel foam and steel increases, the strength of the element will improve, in a way that, the failure mode change from local buckling to yielding.
Keywords
steel foam; steel tube; plate buckling; imperfection; finite element analysis;
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