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Effectiveness of Collars and Hooked-Collars in Mitigating Scour around Different Abutment Shapes.

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Názov: Effectiveness of Collars and Hooked-Collars in Mitigating Scour around Different Abutment Shapes.
Autori: Khan, Zaka Ullah, Ahmed, Afzal, Valyrakis, Manousos, Pasha, Ghufran Ahmed, Farooq, Rashid, Murtaza, Nadir, Khan, Diyar
Zdroj: Water (20734441); Sep2024, Vol. 16 Issue 17, p2550, 29p
Predmety: BRIDGE failures, FROUDE number, REGRESSION analysis, SENSITIVITY analysis, SEDIMENTS
Abstrakt: Abutment scour is a major cause of bridge failures worldwide, leading to disruptions, economic losses, and loss of life. The present experimental study examines countermeasures against abutment scour using hooked-collar protections on vertical-wall and wing-wall abutments (at 45° and 60°) under different flow conditions. All 60 experiments were performed under sub-critical flow conditions by investigating scour around an abutment 20 cm long, 20 cm wide, and 25 cm tall. Two distinct values of the Froude number, 0.154 and 0.179, and a sediment particle diameter (d50) of 0.88 mm were used throughout the experimental phase. The resulting equilibrium scour around the abutments was compared to those with collar and hooked-collar protections. It was determined that the maximum abutment scour depth reduction was 83.89% when hooked collars were placed on vertical wall abutments beneath the bed surface level, and for wing-wall abutments at 45° and 60°, it was 74.2% and 73.5%, respectively, at the bed surface level. Regression analysis was conducted to assess the non-dimensional scour depth (Ds/Yf) and scour reduction (RDs/Yf), with a high enough coefficient of determination (R2 values of 0.96 and 0.93, respectively), indicating high confidence in the analysis. The sensitivity analysis findings demonstrate that the width of the collar (Wc) and La are the most influencing factors affecting Ds/Yf and RDs/Yf. [ABSTRACT FROM AUTHOR]
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Databáza: Complementary Index
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Abstrakt:Abutment scour is a major cause of bridge failures worldwide, leading to disruptions, economic losses, and loss of life. The present experimental study examines countermeasures against abutment scour using hooked-collar protections on vertical-wall and wing-wall abutments (at 45° and 60°) under different flow conditions. All 60 experiments were performed under sub-critical flow conditions by investigating scour around an abutment 20 cm long, 20 cm wide, and 25 cm tall. Two distinct values of the Froude number, 0.154 and 0.179, and a sediment particle diameter (d<subscript>50</subscript>) of 0.88 mm were used throughout the experimental phase. The resulting equilibrium scour around the abutments was compared to those with collar and hooked-collar protections. It was determined that the maximum abutment scour depth reduction was 83.89% when hooked collars were placed on vertical wall abutments beneath the bed surface level, and for wing-wall abutments at 45° and 60°, it was 74.2% and 73.5%, respectively, at the bed surface level. Regression analysis was conducted to assess the non-dimensional scour depth (D<subscript>s</subscript>/Y<subscript>f</subscript>) and scour reduction (R<subscript>Ds</subscript>/Y<subscript>f</subscript>), with a high enough coefficient of determination (R<sup>2</sup> values of 0.96 and 0.93, respectively), indicating high confidence in the analysis. The sensitivity analysis findings demonstrate that the width of the collar (W<subscript>c</subscript>) and L<subscript>a</subscript> are the most influencing factors affecting D<subscript>s</subscript>/Y<subscript>f</subscript> and RD<subscript>s</subscript>/Y<subscript>f</subscript>. [ABSTRACT FROM AUTHOR]
ISSN:20734441
DOI:10.3390/w16172550