Abstract：Large span cable-supported bridges suffer greater risk of terror explosion than normal bridges. The plastic deformation, rupture, tearing and energy dissipation of the orthotropic steel deck under blasting loads of hand-placed bombs and sedan bombs (TNT equivalent 10kg-500kg) were investigated with nonlinear finite element software LS-DYNA. The results show that: the bridge deck’s main energy dissipation mechanisms are the plastic deformation of cover plates and lengthways stiffeners, and the ratio of plastic deformation energy to explosion energy exceeds 70%; the rupture of deck is constrained by the stiffeners and diaphragms, the lengths of ruptures in lengthways are no longer than the distance between two diaphragms, and less than those in width way while the TNT equivalent is from 300kg to 500kg..
2012, Vol. 31 
