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    Clear-Water Local Scour at Skewed Complex Bridge Piers

    New search for: Yang, Yifan
    New search for: Melville, Bruce W.
    New search for: Sheppard, D. M.
    New search for: Shamseldin, Asaad Y.

    An experimental study on flow-induced clear-water local scour at complex bridge piers was conducted using two typical pier models, nine pile-cap elevations, and seven pier skew angles from 0° to 90° with a 15° interval. Results show that a slight skew angle α imposed on an originally aligned pier can significantly increase the equilibrium scour depth d s e . When a pier was skewed to the flow, the column made the largest contribution to the scour depth because its wide-pier feature became dominant. Three categories of the pier skewness were defined, namely, an aligned pier (= 0°), a slightly skewed pier ( α ≈ 15 ° ), and a highly skewed pier ( α ≥ 30 ° ). The influences of the pile cap and the pile group on the scouring process were weakened with increasing α . Additionally, for highly skewed piers with fully submerged pile cap, the equilibrium scour holes tended to equally expose the pier components, no matter the location of the undisturbed bed level. A new scour prediction method is presented, involving modifications for the effect of sediment coarseness. The new method leads to a higher safety margin with significantly reduced underestimation.

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    Clear-Water Local Scour at Skewed Complex Bridge Piers

    New search for: Yang, Yifan
    New search for: Melville, Bruce W.
    New search for: Sheppard, D. M.
    New search for: Shamseldin, Asaad Y.

    An experimental study on flow-induced clear-water local scour at complex bridge piers was conducted using two typical pier models, nine pile-cap elevations, and seven pier skew angles from 0° to 90° with a 15° interval. Results show that a slight skew angle α imposed on an originally aligned pier can significantly increase the equilibrium scour depth d s e . When a pier was skewed to the flow, the column made the largest contribution to the scour depth because its wide-pier feature became dominant. Three categories of the pier skewness were defined, namely, an aligned pier (= 0°), a slightly skewed pier ( α ≈ 15 ° ), and a highly skewed pier ( α ≥ 30 ° ). The influences of the pile cap and the pile group on the scouring process were weakened with increasing α . Additionally, for highly skewed piers with fully submerged pile cap, the equilibrium scour holes tended to equally expose the pier components, no matter the location of the undisturbed bed level. A new scour prediction method is presented, involving modifications for the effect of sediment coarseness. The new method leads to a higher safety margin with significantly reduced underestimation.

    Access

    Check access
    Check availability in my library
    Order at Subito €

    Clear-Water Local Scour at Skewed Complex Bridge Piers

    New search for: Yang, Yifan
    New search for: Melville, Bruce W.
    New search for: Sheppard, D. M.
    New search for: Shamseldin, Asaad Y.

    An experimental study on flow-induced clear-water local scour at complex bridge piers was conducted using two typical pier models, nine pile-cap elevations, and seven pier skew angles from 0° to 90° with a 15° interval. Results show that a slight skew angle α imposed on an originally aligned pier can significantly increase the equilibrium scour depth d s e . When a pier was skewed to the flow, the column made the largest contribution to the scour depth because its wide-pier feature became dominant. Three categories of the pier skewness were defined, namely, an aligned pier (= 0°), a slightly skewed pier ( α ≈ 15 ° ), and a highly skewed pier ( α ≥ 30 ° ). The influences of the pile cap and the pile group on the scouring process were weakened with increasing α . Additionally, for highly skewed piers with fully submerged pile cap, the equilibrium scour holes tended to equally expose the pier components, no matter the location of the undisturbed bed level. A new scour prediction method is presented, involving modifications for the effect of sediment coarseness. The new method leads to a higher safety margin with significantly reduced underestimation.

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    Document information
    Title:

    Clear-Water Local Scour at Skewed Complex Bridge Piers

    Contributors:

    Yang, Yifan (author) / Melville, Bruce W. (author) / Sheppard, D. M. (author) / Shamseldin, Asaad Y. (author)

    Published in:

    Journal of Hydraulic Engineering ; 144

    Publication date:

    2018-03-19

    ISSN:

    0733-9429 , 1943-7900

    DOI:

    https://doi.org/10.1061/(ASCE)HY.1943-7900.0001458

    Type of media:

    Article (Journal)

    Type of material:

    Electronic Resource

    Language:

    Unknown

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