Investigation of the Influences of Explosive Shapes on the Damage of Steel Bridge Decks
The charge shape of explosives significantly affects the release direction of explosion energy.Therefore,different explosive shapes lead to different dynamic responses and damage to the structures under blast loads.To study the effect of explosive shapes on the dynamic responses and damages of steel bridge decks(steel plates and U-rib stiffened steel plates)under explosions,finite element models of bare steel plates and U-rib stiffened steel plates under explosion loads were established based on LS-DYNA.The finite element models were verified by experimental results,such as the post-test phenomenon,residual displacement of the plates,and acceleration time histories.Furthermore,the dynamic responses and plastic damage of the steel plates and U-rib-stiffened steel plates were analyzed using a verified numerical model.Explosives with three shapes(spherical,cubic,and cylindrical,with an aspect ratio of 1)were considered in this study.The plates were subjected to local and global uniform explosions in this investigation.The different responses and damages caused by the cylinder facing the steel plates and the U-rib stiffened steel plates axially and radially were considered for the cylinder charge.The results show that under the local explosion and general explosion conditions,the plastic damages caused by cylinder-1(directly facing the plate surface in the axial direction)and cubic charge showed significant similarity to the U-rib stiffened steel plate and flat steel plate.In addition,under the local explosion conditions,the local characteristics of the deformation caused by cylinder-1 and cubic charge to the U-rib stiffened steel plates and flat steel plates were significantly larger than those of cylinder-2(directly facing the plate surface in the radial direction)and spherical charge.The bare steel plates and U-rib stiffened plates exhibited notable inner dome deformation under the local explosion conditions.The displacement responses and plastic damages of the bare steel plate and U-rib stiffened steel plates under the spherical charge explosions were the smallest,and the deformations of the steel plates and U-rib stiffened steel plates subjected to the spherical charge explosion were relatively uniform compared to other shapes of explosives.Under the explosions of the four types of explosives,the displacement response and damage order of the steel plate and U-rib stiffened steel plate were:cube≈cylinder-1(directly facing the plate surface in the axial direction)＞cylinder-2(directly facing the plate surface in the radial direction)＞spherical.
NETL
NSTL
万方数据
