Vessel-bridge collision is an important issue that should be considered for the bridge structures across the channel. In this paper, two sorts of vessels referred from AASHTO specifications are taken as examples to study the differences of impact force histories, barge bow stiffness and energy transitions. The reason account for the differences is also discussed. The responses by the dynamic model in this paper are compared with the ones according to several specifications. The results show that different barge bow configurations and inner elements layouts will make significant influence on the impact force. The peak impact force by barge collision is higher than the force due to ship collision at same tonnage and impact velocity. The displacement of pier top due to barge collision is smaller than ship collision, while the barge collision causes a higher base shear and base moment than the ship collision. The dynamic magnification factors of bridge responses have remarkable differences between barge collision and ship collision. Significant differences exist in the vessel collision load of different specifications. Eurocode will give relative higher responses generally. The smallest responses for inland vessel collisions will obtained by China highway specifications, and China railway specifications will derive the smallest responses for seagoing ships collisions.
Key words
vessel-bridge collision /
barge /
cargo ship /
impact force /
bridge response analysis
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References
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Footnotes
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