The major damage to bridges occurs due to scour of the bed materials around piers
and abutments during severe floods. This study involves the experimental
investigations of the various scour patterns forming around abutment models tested
with and without collars as scour countermeasures. The experiments were conducted
in a rectangular channel under clear-water scour conditions.
In the first part of this study, 34 experiments were conducted with semi-circular end
abutment models with and without a collar for a period of 3 hours. Collars of various
sizes were placed at different elevations on the abutment models, and the scour
reduction efficiencies of collars were investigated for the different flow depths.
Based on the results of the experimental studies, the optimum locations of collars on
the abutments, which result in minimum scour depth around the abutments, are
obtained at the bed level and below the bed level depending on the flow intensity
values.
In the second part of this study, the effects of flow depth and abutment length on the
temporal development of local scour at bridge abutments were studied. 20
experiments were performed without collars for a time period of 8 hours. It was
observed that at the upstream of the abutment, the depth of the local scour increases
rapidly within the first three hours of the experiment for the different flow depths.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12614405/index.pdf |
| Date | 01 June 2012 |
| Creators | Tekin, Fatime |
| Contributors | Koken, Mete |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | Access forbidden for 1 year |
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