Determining the Flood Flow Characteristics of Submerged Bridge Superstructure
Bridges are a critical component of the nation's transportation network. Highway bridge superstructures over large waterways may become partially or completely submerged during a flood event. During flood periods, the presence of bridges may cause backwater and this is considered as obstruct...
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| Format: | Thesis |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.intimal.edu.my/89/1/BCEGI%20-%2020.pdf http://eprints.intimal.edu.my/89/ |
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| Summary: | Bridges are a critical component of the nation's transportation network. Highway bridge
superstructures over large waterways may become partially or completely submerged
during a flood event. During flood periods, the presence of bridges may cause backwater
and this is considered as obstruction. In addition, flood flows add possible forces such as
drag force and uplift force on the bridge structure thus causing damages to the bridge
superstructure and lead to failure. General practices in highway engineering make it
necessary to give more attention to aspects of hydraulic design which determine the
security of a structure against action of water where the bridges are placed. A study based
on theoretical and experimental procedures using a prototype of bridges in laboratory was
conducted to investigate and analysis the backwater occurred to the bridge superstructure
and forces on submerged bridge. The results show that the higher the inundation depth of
the bridge superstructure is, the higher backwater height occurred at the upstream of the
bridge. While for drag force, it is found out that is directly proportional to the Froude
Number and inundation depth. Lift force increases as inundation depth increase, but it
decreases as the Froude Number increases. |
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