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

摘要

This paper analyses the effects of air-structure interaction of systems subjected to weak blast loads. While these coupling effects are negligible for typical steel or concrete structures, they may dominate the dynamic response of lighter and more flexible (compliant) systems like membranes, blast curtains or cable facades. For these light and flexible systems, a classical decoupled analysis, i.e., neglecting the influence of the surrounding air, might significantly overestimate the deflections and strains. However, we show that the coupling effects can be accounted for by basically adding a viscous aerodynamic damping force. We discuss and compare two approaches how to obtain the aerodynamic damping term. With decreasing structural stiffness and mass, the damping contribution of air increases significantly. The results of Hydrocode simulations are presented, and an outlook into further areas of research is given.