1. Contact and close-range explosive loading on a single span steel-concrete bowstring-arch highway bridge and damage prediction.
- Author
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Akram, Shahbaz, Umair, Mohammad, Alam, Mehtab, and Anas, S. M.
- Subjects
PROGRESSIVE collapse ,BRIDGE design & construction ,FRACTURE mechanics ,SERVICE life ,IRON & steel bridges ,ARCHES - Abstract
Unexpected accidental events of extreme loadings may develop exceptionally high stresses in the materials of the structures damaging key elements and may cause disproportionate collapse or even initiate progressive collapse. Bridge structures being lifelines mainly of cosmopolis and also of strategic bordering environments have economic and political importance and their failure may have serious repercussions. For short-span, steel bowstring-arch bridge is a viable option over congested crossings and remote border areas. Current bridge design codes of practice neither consider high-strain loadings (blast, impact) nor recommend provisions to prevent their occurrence during the construction or service life. Contact explosive events are more damaging in terms of material failure/loss than close-range or non-contact ones. Little research work has been done in the past addressing steel-concrete bridge response to explosions. This work numerically investigates the response of a simply supported steel-concrete bowstring-arch highway girder bridge under contact and close-range explosion including lateral eccentricity of the explosive. Analysis software package Abaqus is used to model the bridge and predict its response under concentric and eccentric locations of the cubical TNT having a mass of 1630kg detonated at one-half of the bridge span. Explosive is defined using the Eulerian-Lagrangian scheme. Propagation of the explosive waves in the material of the bridge under the considered loading conditions is presented and explained. Bridge response in terms of plastic strains, principal stress, deflection, crater size, and total damage energy is investigated. The position of the TNT producing maximum damage to the bridge is identified. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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