ANALYSIS OF EFFECT OF MOMENTUM ON THE BEHAVIOR OF RC BEAMS UNDER LOW VELOCITY IMPACT LOADING
Author(s)
YONG JAE YU, JAE-YEOL CHO
Abstract
Recently, the demand for structural safety under impact loading has been increased because the risk of exposure to the infrastructure to impact loading increases. The behavior of the structures under impact loading is a very complex phenomenon. For this reason, it is required to develop a rational method to estimate the impact resistance of structures. Some researchers have suggested performance based design method to do this. They conducted drop weight impact test and proposed empirical equations for evaluating the impact resistance. However, these equations were derived from small impact energy range. In addition, these equations did not consider the effect of the momentum of drop weight and only reflected the impact energy of drop weight. There are various combinations of mass and impact velocity of drop weight having the same impact energy. Thus, it is also necessary to consider the momentum of the drop weight. In this study, the effect of the momentum of drop weight is assessed through finite element analysis using LS-DYNA program. From this analysis, it was confirmed that the behaviors of RC beams such as maximum deflection and failure mode are related to the combination. These results imply that the design of concrete structures subjected to impact loading should consider the momentum, that is, a combination of mass and impact velocity.
Keywords
momentum, finite element analysis, drop weight impact test
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