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KeunKi Choi; Jungwhee Lee; Chul-Hun Chung; Dongwoo An; Jaeyong Yoon. Structural Behavior Evaluation of a Cable-Stayed Bridge Subjected to Aircraft Impact: A Numerical Study. Journal of the Computational Structural Engineering Institute of Korea 2021, 34, 137 -149.
AMA StyleKeunKi Choi, Jungwhee Lee, Chul-Hun Chung, Dongwoo An, Jaeyong Yoon. Structural Behavior Evaluation of a Cable-Stayed Bridge Subjected to Aircraft Impact: A Numerical Study. Journal of the Computational Structural Engineering Institute of Korea. 2021; 34 (3):137-149.
Chicago/Turabian StyleKeunKi Choi; Jungwhee Lee; Chul-Hun Chung; Dongwoo An; Jaeyong Yoon. 2021. "Structural Behavior Evaluation of a Cable-Stayed Bridge Subjected to Aircraft Impact: A Numerical Study." Journal of the Computational Structural Engineering Institute of Korea 34, no. 3: 137-149.
Cable-stayed bridges are infrastructure facilities of a highly public nature; therefore, it is essential to ensure operational safety and prompt response in the event of a collapse or damage, which are caused by natural and social disasters. Among social disasters, blast accidents can occur in cable-stayed bridges as a result of explosions produced by vehicle collisions or terrorist attacks; this can lead to the degradation in their structural performances and subsequent collapse. In this research, a procedure to assess structural blast-resistance performance is suggested based on a numerical analysis approach, and the feasibility of the procedure is demonstrated by performing an example assessment. The suggested procedure includes (1) selection of major structural components that severely affect the global structural behavior, (2) set-up blast hazard scenarios consisting of various blast levels and locations, and (3) assessment of the components using numerical blast simulation. By performing an example assessment, the critical blast level for each component could be determined and the blast location that affects the considering components the most severely could be found as well. The scenario-based assessment process employed in this study is expected to facilitate the evaluation of bridge structures under blasts in both existing bridges and future designs.
Jungwhee Lee; KeunKi Choi; Chulhun Chung. Numerical Analysis-Based Blast Resistance Performance Assessment of Cable-Stayed Bridge Components Subjected to Blast Loads. Applied Sciences 2020, 10, 8511 .
AMA StyleJungwhee Lee, KeunKi Choi, Chulhun Chung. Numerical Analysis-Based Blast Resistance Performance Assessment of Cable-Stayed Bridge Components Subjected to Blast Loads. Applied Sciences. 2020; 10 (23):8511.
Chicago/Turabian StyleJungwhee Lee; KeunKi Choi; Chulhun Chung. 2020. "Numerical Analysis-Based Blast Resistance Performance Assessment of Cable-Stayed Bridge Components Subjected to Blast Loads." Applied Sciences 10, no. 23: 8511.
This study presents a numerical assessment of the effects of tensioning and curvature on the impact resistance performance of a prestressed concrete wall. Specifically, a prestressing method and numerical analysis method applying an impact load-time function are proposed and described. To transfer of initial prestress to the wall, the prestressing method employs a thermal load and appropriate boundary conditions are selected for the wall end to generate appropriate deformation on the wall due to prestress. The differences in impact resistance performance are then compared and analyzed according to variations in the curvature and prestress of the wall. The impact analysis results show that the degree of displacement and damage to the wall decreases for all wall shapes with a higher prestressing ratio. Furthermore, cylindrical and hemispherical walls relative to flat walls verify that the arching effect generated by the curvature of the wall reduces the displacement response of the wall.
Chul-Hun Chung; KeunKi Choi; Hyun Sung Choi; Jungwhee Lee. Local impact resistance analysis of prestressed concrete structures considering curvature and post-tensioning effects. Annals of Nuclear Energy 2020, 142, 107415 .
AMA StyleChul-Hun Chung, KeunKi Choi, Hyun Sung Choi, Jungwhee Lee. Local impact resistance analysis of prestressed concrete structures considering curvature and post-tensioning effects. Annals of Nuclear Energy. 2020; 142 ():107415.
Chicago/Turabian StyleChul-Hun Chung; KeunKi Choi; Hyun Sung Choi; Jungwhee Lee. 2020. "Local impact resistance analysis of prestressed concrete structures considering curvature and post-tensioning effects." Annals of Nuclear Energy 142, no. : 107415.