Aerodynamic Damping And Fluid-structure
Interaction Of Blast Loaded Flexible Structures
Author(s)
M. Teich & N. Gebbeken
Abstract
This paper analyses the effects of air-structure interaction and derives a new
coupling model for systems subjected to weak blast loads. While the coupling
effects are negligible for typical steel or concrete structures, they may dominate
the dynamic response of lighter and more flexible systems like membranes, blast
curtains or cable facades. For these systems, a classical decoupled analysis, i.e.,
neglecting the influence of the surrounding air, might significantly overestimate
the deflections and strains. The results of parameter studies are presented, and
recommendations for the blast resistant design of flexible protective structures are
given.
Keywords: aerodynamic damping, blast-structure interaction, flexible protective
structure.
1 Introduction
The military has extensive knowledge and experience in protective design against
blast and weapon effects. With increasing terrorist threats this knowledge is
transferred to civilian applications [1]. Military protective structures like bunkers
are often build with highly reinforced concrete. At the same time, civilian
architectural trends head towards transparent, light and flexible structures like large
cable net facades or membranes. Military methods and procedures, e.g. [2, 3],
which are valid for the blast analysis of heavy and massive structures cannot
be used in these cases. This paper contributes to a better understanding of the
interaction of blast waves with light and compliant systems.
In the following Section 2, aerodynamic damping effects are illustrated. Then, in
Section 3, we derive an analytical single degree of freedom (SDOF) fluid-structure
interaction (FSI) model valid for the analysis of weak blast waves with linear or
Keywords
aerodynamic damping, blast-structure interaction, flexible protective
structure
Related Book
Other papers in this volume
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