Structures Subjected to Low-Level Blast Loads: Analysis of Aerodynamic Damping and Fluid-Structure Interaction
Publication: Journal of Structural Engineering
Volume 138, Issue 5
Abstract
This paper presents the structural behavior of idealized linear single-degree-of-freedom systems subjected to weak blast loads. The authors derive a new coupling model taking into account fluid-structure interaction (FSI) and aerodynamic damping resulting from the surrounding air. This model contributes to a better understanding of the physical coupling phenomena and can be used for the validation of more complex numerical models. Especially mass and stiffness determine the effects of aerodynamic damping and FSI on the deformations, internal forces, and energy contributions. Although the coupling effects are negligible for stiff or heavy systems (e.g., reinforced concrete structures), they significantly influence the structural response of flexible and light systems (e.g., membrane structures or glazing facades). On the basis of the new coupling model, the authors derive a decoupled model incorporating aerodynamic damping and FSI effects. This decoupled model is derived on the basis of an equivalent viscous damping ratio depending on mass and structural stiffness. Finally, a response spectrum is derived, synthesizing the discussed results.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 138 • Issue 5 • May 2012
Pages: 625 - 635
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Sep 22, 2010
Accepted: Aug 15, 2011
Published online: Aug 17, 2011
Published in print: May 1, 2012
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