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Structural Engineering and Mechanics Volume 51, Number 6, September25 2014 , pages 1017-1036 DOI: https://doi.org/10.12989/sem.2014.51.6.1017 |
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Improving buckling response of the square steel tube by using steel foam |
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Mohammadreza Moradi and Sanjay R. Arwade
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| 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. | ||
| Key Words | ||
| steel foam; steel tube; plate buckling; imperfection; finite element analysis | ||
| Address | ||
| Mohammadreza Moradi : Department of Civil and Environmental Engineering, Old Dominion University, Norfolk, VA, 23529, USA Sanjay R. Arwade : Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, 01003, USA | ||