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Dynamic plastic response of beams subjected to localised pulse loads

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Title: Dynamic plastic response of beams subjected to localised pulse loads
Authors: Soleiman Fallah, A
Louca, L
Mehreganian, N
Thil, N
Moatamedi, M
Item Type: Journal Article
Abstract: Localised blast loads give rise to high gradients of overpressure detrimental to structural elements as beams and plates. This article presents an analytical study on the dynamic plastic response of beams made of a ductile metallic material due to close-in pulse pressure loading. The close-in pressure load is characterised by a spatially varying function constant over a central region and exponentially decaying beyond it. The temporal pulse shape is assumed to take different forms. The exact static plastic collapse load was obtained for the characteristic load using the framework of plastic limit analysis, whereby the analysis was then extended to the dynamic case by considering the appropriate yield surface and inclusion of inertia forces. The yield surfaces considered were representative of pure bending, the interactions between the bending moment and transverse shear, and bending moment and membrane force, each corresponding to a special case depending on the geometry of the beam. A time-dependent, kinematically admissible velocity profile was assumed to treat the dynamic formulations in interaction of each phenomenon. A study on the strain-rate sensitivity was also presented, and existence of a critical pressure triggering the apparition of travelling plastic hinges was hence highlighted. For blast loads of high magnitude, the expressions for normalised deflection were furnished in terms of the impulsive velocity. The analytical models were validated by performing a parametric study on the two-dimensional representative of the beam model in commercial finite element software ABAQUS 6.14. The numerical results show a good correlation with the analytical results in each case.
Issue Date: 1-Jun-2019
Date of Acceptance: 1-Oct-2018
URI: http://hdl.handle.net/10044/1/65204
DOI: https://dx.doi.org/10.1177/2041419618807721
ISSN: 2041-4196
Publisher: Multi-Science Publishing
Start Page: 198
End Page: 228
Journal / Book Title: International Journal of Protective Structures
Volume: 10
Issue: 2
Copyright Statement: © The Author(s) 2018. The final, definitive version of this paper has been published in International Journal of Protective Structures by Sage Publications Ltd. All rights reserved. It is available at: https://journals.sagepub.com/doi/10.1177/2041419618807721
Keywords: Science & Technology
Engineering, Civil
Localised blast
rigid plastic beam
bound theorems of plasticity
travelling plastic hinge
dynamic plastic response
0905 Civil Engineering
Publication Status: Published
Online Publication Date: 2018-10-31
Appears in Collections:Civil and Environmental Engineering
Faculty of Engineering