No abstract

No abstract

The advantage of using Autodyn, a specialized hydro-code for the analysis of explosion and impact, is its appropriateness for predicting the progressive collapse of a building when a column still has some load-bearing capacity left after a blast. However, the requirement of sharing nodes between volume elements for concrete and line elements for reinforcements hampers its application to the blast analysis of large-scale reinforced concrete structures. In this article, the blast analysis of a reinforced concrete frame structure is simulated using the reinforcement contact model in Autodyn. This modeling method shows structural behavior under blast load similar to that of a more precise model with reinforcement and concrete. Furthermore, this method allows for faster simulation of progressive collapse analysis for tall buildings. The effect of steel reinforcement patterns and spacing of stirrups in reinforced concrete beams is demonstrated by performing several progressive collapse analyses with the reinforcement contact model. Thus, the proposed modeling method can be effectively applied to the blast-loading progressive collapse analysis of a reinforced concrete frame structure.

No abstract

In this paper, internal blast effect of reinforced concrete core structure were investigated using Ansys Autodyn, which is a specialized hydrocode for the analysis of explosion and impact. It is expected that internal blast case can give additional damage to the structure because it causes rebound of blast loads. Therefore, in this paper, the hazard of internal blast effect is demonstrated using UFC 3-340-02 criteria. In addition, analysis result of Autodyn, experimental result regarding rebound of blast load, and example of UFC 340-02 are compared to verify that Autodyn can analyze internal blast effect properly. Furthermore, progressive collapse mechanism of core structure which is one of the most important parts in high rise buildings is also analyzed using Autodyn. When internal blasts are loaded to core structure, the core structure is mostly damaged on its corner and front part of core wall from explosives. Therefore, if the damaged parts of core wall are demolished, progressive collapse of the core structure can be initiated.