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http://dx.doi.org/10.7734/COSEIK.2019.32.5.287

Effect of Ground Boundary Condition on Evaluation of Blast Resistance Performance of Precast Arch Structures  

Lee, Jungwhee (epartment of Civil and Environmental Engineering, Dankook Univ.)
Choi, Keunki (epartment of Civil and Environmental Engineering, Dankook Univ.)
Kim, Dongseok (Institute of Technology, Interconstech Co., Ltd.)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.32, no.5, 2019 , pp. 287-296 More about this Journal
Abstract
In this study, the effect of ground boundary conditions on the evaluation of blast resistance performance of precast arch structures was evaluated by a numerical analysis method. Two types of boundary conditions, namely, fixed boundary conditions and a perfectly matched layer (PML) were applied to numerical models. Blast loads that were much higher than the design load of the target structure were applied to compare the effects of the boundary conditions. The distribution and path of the ground explosion pressure, structural displacement, fracture of concrete, stress of concrete, and reinforcing bars were compared according to the ground boundary condition settings. As a result, the reflecting pressure shock wave at the ground boundaries could be effectively eliminated using PML elements; furthermore, the displacement of the foundation was reduced. However, no distinct difference could be observed in the overall structural behavior including the fracture and stress of the concrete and rebar. Therefore, when blast simulations are performed in the design of protective structures, it is rational to apply the fixed boundary condition on the ground boundaries as conservative design results can be achieved with relatively short computation times.
Keywords
blast resistance; blast simulation; PML; LS-DYNA; precast arch structures;
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Times Cited By KSCI : 4  (Citation Analysis)
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