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http://dx.doi.org/10.7734/COSEIK.2021.34.6.371

Analysis of Rebound Behavior of Blast-Resistant Door Subjected to Blast Pressure  

Shin, Hyun-Seop (Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology(KICT))
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.34, no.6, 2021 , pp. 371-383 More about this Journal
Abstract
Steel-concrete single-leaf blast-resistant doors, having steel box and slab inside, are installed on the wall using supporting members such as hinges and latches. Several studies have been conducted on their deflection behavior in the same direction as that of the blast pressure, but studies on their deflection behavior in the opposite direction, that is, studies on negative deflection behavior are relatively insufficient. In this study, we conducted a parameter analysis using finite element analysis on blast-resistant doors, on their rebound behavior in the negative deflection phase. Results revealed that the plastic deformation of the door, and the change in momentum and kinetic energy during rebound, were major factors influencing the rebound behavior. Greater rebound force was developed on the supporting members in the impulsive region, than in the quasi-static region; due to the characteristics in the impulsive region, where the kinetic energy developed relatively greater than the strain energy. In the design process, it is necessary to consider excessive deformation that could occur in the supporting members as the rebound behavior progresses. Additionally, it was found that in the case of steel-concrete blast doors, the rebound force increased relatively more, when the effects of both rebound and negative blast pressure contributed to the negative deflection of the door. Since conditions for the occurrence of this superposition effect could vary depending on structural characteristics and explosion conditions, further investigation may be required on this topic.
Keywords
blast-resistant door; rebound force; negative blast pressure; finite element analysis;
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