Cross-section shape effects on anti-knock performance of RC columns subjected to air and underwater explosions

摘要

Columns are the key load-bearing elements in infrastructures. Common cross-section shapes of columns are square and circle. Those columns may be subjected to various blasting scenarios. This paper investigates the effects of cross-section shape on the anti-knock performance of RC columns subjected to air and underwater blast loads. The reliability of the fully coupled Lagrangian-Eulerian numerical model is verified by comparing with the results of the field blast test. The damage characteristics and dynamic response of the RC column with different cross-section shapes subjected to contact and close-in air explosions are investigated. The anti-knock performance of the RC column with different cross-section shapes subjected to contact and close-in underwater explosion is also studied. Nonlinear dynamic response behavior and damage mechanism of the RC column subjected to contact and dose-in explosion are compared. The improvement effects of the reinforcement ratio and ultra-high performance concrete on the blast resistance of the underwater RC column are investigated. The results show that the cross-section shape has an important influence on the anti-knock performance of the column, whether subjected to air or underwater explosions. Employing circular cross-section can effectively improve the blast resistance of the column.