Abstract
This paper aims at investigating the dynamic response of the steel box girder under internal blast loads through experiments and numerical study. Two blast experiments of steel box models under internal explosion were conducted, and then, the numerical methods are introduced and validated. The dynamic response process and propagation of the internal shock wave of a steel box girder under internal blast loading were investigated. The results show that the propagation of the internal shock wave is very complicated. A multi-impact effect is observed since the shock waves are restricted by the box. In addition, the failure modes and the influence of blast position as well as explosive mass were discussed. The holistic failure mode is observed as local failure, and there are two failure modes for the steel box girder's components, large plastic deformation and rupture. The damage features are closely related to the explosive position, and the enhanced shock wave in the corner of the girder will cause severe damage. With the increasing TNT mass, the crack diameter and the deformation degree are all increased. The longitudinal stiffeners restrict the damage to develop in the transverse direction while increase the crack diameter along the stiffener direction.
Highlights
Since the 9–11 attacks by terrorists, there has been increasing public concern about the threat of bomb attacks on infrastructure such as bridges and tunnels as well as buildings
Tang and Hao [14] and Hao and Tang [15] studied the localized destruction of the bridge towers, piers, and deck structure as well as the overall collapse of a long span cable-stayed bridge under car bomb blast loading through numerical simulations with the nonlinear finite element software LS-DYNA
Aiming at the problem of large span cable-supported steel bridges suffering the threat of terrorist blast attack, the dynamic response process and propagation of internal shock wave of the steel box girder under internal blast loading were investigated in the current research with nonlinear finite element software LS-DYNA and the fluid-solid coupling arithmetic method of ALE multimaterial formulations. e failure mode and the influence of blast position as well as explosive mass were discussed
Summary
Since the 9–11 attacks by terrorists, there has been increasing public concern about the threat of bomb attacks on infrastructure such as bridges and tunnels as well as buildings. Large span cable-supported bridge is under great risk of terrorist bomb attacks; many scholars processed numbers of numerical simulation studies on it. Tang and Hao [14] and Hao and Tang [15] studied the localized destruction of the bridge towers, piers, and deck structure as well as the overall collapse of a long span cable-stayed bridge under car bomb blast loading through numerical simulations with the nonlinear finite element software LS-DYNA. E total element numbers for the shell and solid are 42,820 and 1520,875, respectively In these numerical models, ∗MAT_HIGH_ EXPLOSIVE_BURN is used for high explosives (TNT), and the JWL equation of state is adopted to model the pressure generated from blast [25]. In these numerical models, ∗MAT_HIGH_ EXPLOSIVE_BURN is used for high explosives (TNT), and the JWL equation of state is adopted to model the pressure generated from blast [25]. e Johnson–Cook material model together with the Gruneisen state equation is used to model the dynamic behavior of the steel box [26, 27]
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