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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.

Aerodynamic damping and fluid-structure interaction of blast loaded flexible structures