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Structural Engineering and Mechanics Volume 66, Number 6, June25 2018 , pages 713-727 DOI: https://doi.org/10.12989/sem.2018.66.6.713 |
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Energy absorption of the ring stiffened tubes and the application in blast wall design |
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JinJing Liao and Guowei Ma
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| Abstract | ||
| Thin-walled mental tubes under lateral crushing are desirable and reliable energy absorbers against impact or blast loads. However, the early formations of plastic hinges in the thin cylindrical wall limit the energy absorption performance. This study investigates the energy absorption performance of a simple, light and efficient energy absorber called the ring stiffened tube. Due to the increase of section modulus of tube wall and the restraining effect of the T-stiffener flange, key energy absorption parameters (peak crushing force, energy absorption and specific energy absorption) have been significantly improved against the empty tube. Its potential application in the offshore blast wall design has also been investigated. It is proposed to replace the blast wall endplates at the supports with the energy absorption devices that are made up of the ring stiffened tubes and springs. An analytical model based on beam vibration theory and virtual work theory, in which the boundary conditions at each support are simplified as a translational spring and a rotational spring, has been developed to evaluate the blast mitigation effect of the proposed design scheme. Finite element method has been applied to validate the analytical model. Comparisons of key design criterions such as panel deflection and energy absorption against the traditional design demonstrate the effectiveness of the proposed design in blast alleviation. | ||
| Key Words | ||
| ring stiffened tube; blast wall; flexible support; energy absorption; analytical model; finite element analysis | ||
| Address | ||
| JinJing Liao: 1) Atkins Australasia Pty Ltd., Level 8, 50 St Geroges Terrace, Perth WA 6000, Australia 2) School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia Guowei Ma 1) School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China 2) School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia | ||