In this paper, the structural responses of steel beams subjected to air-blast loading are investigated. In order to assess the response of beams, two Single Degree of Freedom models are developed. In the first model (denoted as “dynamic model”), the dynamic behaviour of the beam is simulated by a simple spring-mass oscillator. The second model (named “energy model”) is developed from the equation of energy balance. In both formulations, the strain rate dependencies of the constitutive properties of the beams are considered. In fact, these effects should not be ignored in problems concerning blast and impulsive loads, since the mechanical properties of steel strongly depend on the rate of deformation. In this paper, strain rate effects are considered in accordance with the espression provided by Cowper-Symonds strain rate model. Finally, in order to test the validity of the two approaches, the theoretical results produced by the latter ones are compared with some experimental data found in literature. Both approaches yield reliable results, even though they are based on some approximations. Being also very simple to implement, they may serve as an useful tool in practical applications.
AZIONI ESPLOSIVE SU TRAVI IN ACCIAIO
STOCHINO, FLAVIO;
2013-01-01
Abstract
In this paper, the structural responses of steel beams subjected to air-blast loading are investigated. In order to assess the response of beams, two Single Degree of Freedom models are developed. In the first model (denoted as “dynamic model”), the dynamic behaviour of the beam is simulated by a simple spring-mass oscillator. The second model (named “energy model”) is developed from the equation of energy balance. In both formulations, the strain rate dependencies of the constitutive properties of the beams are considered. In fact, these effects should not be ignored in problems concerning blast and impulsive loads, since the mechanical properties of steel strongly depend on the rate of deformation. In this paper, strain rate effects are considered in accordance with the espression provided by Cowper-Symonds strain rate model. Finally, in order to test the validity of the two approaches, the theoretical results produced by the latter ones are compared with some experimental data found in literature. Both approaches yield reliable results, even though they are based on some approximations. Being also very simple to implement, they may serve as an useful tool in practical applications.
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