Prediction of Equilibrium Local Scour Depth at Complex Bridge Piers

Moreno, Mario; Maia, Rodrigo; Couto, Lúcia

doi:10.1061/(asce)hy.1943-7900.0001153

Cited by 31 publications

(8 citation statements)

References 19 publications

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“…7). This is in accordance with the previous studies which have shown that the effects of compressed horseshoe vortices and wake vortex interactions between sequence piles increase as s d p ⁄ decreases (Lança et al, 2013b;Moreno et al, 2016). According to the present results for uniform sediment bed case C2, the equilibrium scour depth at A declining trend of d Sme with the increase of s d p ⁄ for uniform sediment beds was not observed in non-uniform sediment beds (Fig.…”

Section: The Evaluation Of Pile Spacing Factor For Different Sediment...supporting

confidence: 93%

“…In order to compare the results of the present study with those obtained by scour predictors, the equilibrium scour depth must be estimated. Following the notation by Moreno et al (2016), the equilibrium state in scour evolution can be obtained asymptotically. Hence, the recorded scour depth values through time were extrapolated to infinite time by the form of polynomial function to estimate the equilibrium scour depth, d Sre , as suggested by Lança et al (2010).…”

Section: Results and Discussion Data Presentation And Results For Sin...mentioning

confidence: 99%

“…Previous studies in the case of pile groups were limited to the uniform sediments and suggested different equations to calculate an equivalent pier width to substitute the pier width in the single-pier scour equations (e.g., Ataie-Ashtiani and Beheshti, 2006;Coleman, 2005;Moreno et al, 2016;Sheppard and Renna, 2010;Yang et al, 2020). To the best of the author's knowledge, no prior studies have examined local scour around group of piles in non-uniform sediments.…”

Section: Introductionmentioning

confidence: 99%

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Effects of bed-material gradation on clear water scour at single and group of piles

Okhravi

Gohari

Alemi

et al. 2022

Journal of Hydrology and Hydromechanics

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This study presents the results of 32 laboratory experiments on local scour at a single pile and a 1 × 4 pile group for both uniform and non-uniform sediments under clear water conditions. The present study aims to evaluate the effects of different sediment beds made up of mixtures of sand and gravel (four-bed configurations) in d 50 (1–3.5 mm) and gradation (1.4–3) ranges on scour depth for different flow discharges and flow depths. Further, the findings of the experiments are deployed to describe the effects of pile spacing and flow conditions on the local pier scour for both uniform and non-uniform bed granulometries. In addition, this study addresses the performance of some existing scour-depth predictors. Also, the corresponding results are suitable for validating the numerical models in local pier scour prediction importantly with non-uniform sediments. In summary, the results show that effects of sediment gradation dampen with increasing flow shallowness. Furthermore, the maximum scour depth at pile groups generally increases as pile spacing decreases for uniform sediments, whereas the mentioned trend was not observed for non-uniform sediments for the same flow and sediment conditions. Moreover, the experimental results revealed that bed sediment gradation is a controlling factor in the pile’s scour. Thus, the existing scour depth predictions could be highly improved by considering sediment gradation in the predictions. Finally, the conclusions drawn from this study provide crucial evidence for the protection of bridge foundations not only at the front pile but also at rear piles.

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Section: The Evaluation Of Pile Spacing Factor For Different Sediment...supporting

confidence: 93%

Section: Results and Discussion Data Presentation And Results For Sin...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of bed-material gradation on clear water scour at single and group of piles

Okhravi

Gohari

Alemi

et al. 2022

Journal of Hydrology and Hydromechanics

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“…Recent studies (e.g., Moreno et al 2012;Ferraro et al 2013) show that the scour depth evolution in complex piers follows different stages in comparison with single piers. That is associated with the progressive physical presence in the scour hole evolution of one, two, or three structural components of the complex pier.…”

Section: Temporal Evolution Of the Scour Depthmentioning

confidence: 99%

Effects of Relative Column Width and Pile-Cap Elevation on Local Scour Depth around Complex Piers

2016

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An experimental campaign of 25 long-duration (13-47 days) laboratory tests was carried out with three complex pier models under steady clear-water flow conditions. Each model, characterized by a different relation between the column and the pile-cap widths, D c =D pc , was tested for a variety of pile-cap positions relatively to the initial bed, H c. The experimental data were used to describe the temporal evolution of the scour depth as a function of H c =h (h = approach flow depth). The common criterion to stop experimental tests on complex piers was analyzed, and a new criterion was introduced. The equilibrium scour depth, d se , was calculated by extrapolation of data series. The results are used to evaluate the effect of D c =D pc and H c =h on d se when the pile cap is above the bed (Situation 1), partially buried in the bed (Situation 2), and completely buried in the bed (Situation 3). The analysis includes the definition of H c at which the maximum d se occurs through an equation that takes into account the D c =D pc ratio, the relative pile-cap thickness, T=h, and the column and pile-cap shapes.

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“…A typical complex bridge pier often consists of a wall-like column supporting the bridge deck and superstructures, a pile-cap under the column, and a group of piles supporting the pile-cap. Complex bridge piers are usually built in close proximity to each other for large bridges with multiple lanes, parallel companion bridges (especially highway-railway Previous studies have paid much attention to current-induced scour at multiple piles (Hannah [2]; Elliott and Baker [3]; Zhao and Sheppard [4]; Sumer et al [5,6]; Ataie-Ashtiani and Beheshti [7]; Amini et al [8]; Liang et al [9]; Lança et al [10]; Das and Maxumdar [11]; Wang et al [12]; Khaple et al [13]; and Kim et al [14]) and scour at complex piers (Jones and Sheppard [15]; Coleman [16]; Sheppard and Glasser [17]; Ataie-Ashtiani et al [18]; Grimaldi and Cardoso [19]; Beheshti & Ataie-Ashtiani [20,21]; Moreno et al [22][23][24]; Ferraro et al [25]; Amini et al [26]; Baghbadorani et al [27]; and Yang et al [28]), respectively. However, there is still no solution for dealing with scenarios with multiple complex piers, indicating an obvious gap of the existing knowledge.…”

Section: Introductionmentioning

confidence: 99%

Local Scour at Complex Bridge Piers in Close Proximity under Clear-Water and Live-Bed Flow Regime

Yang

Melville

Macky

et al. 2019

Water

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In this study, we investigated the characteristics of scour at complex bridge piers in close proximity. The experiments were performed under both clear-water and live-bed flow regimes. We compare our results with those for a single complex pier. Further, the performance of existing predictors is discussed. In this study, four typical pier arrangements were adopted, including side-by-side with aligned or 30 • skewed flow, staggered, and tandem. The results show that the skew angle for a side-by-side arrangement significantly accelerates the clear-water scour development at all the vertical piles as well as between the piers, and the most scoured pile shifts from the upstream end to the downstream end of the upstream pier flank. The staggered and tandem pier arrangement show significant protection to the downstream pier for both the developing rate and the equilibrium scour depth. When the flow velocity exceeds the threshold for general bed motion, the clear-water scour pattern for all the pier arrangements may be altered significantly due to the upstream sediment supply, the weakened protection effect, and the enhanced flow contraction. The bed-forms migrate via the bridge opening and are damped gradually by the flow, and thus the response of the bed morphology under live-bed conditions is quite unsteady.

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Prediction of Equilibrium Local Scour Depth at Complex Bridge Piers

Cited by 31 publications

References 19 publications

Effects of bed-material gradation on clear water scour at single and group of piles

Effects of bed-material gradation on clear water scour at single and group of piles

Effects of Relative Column Width and Pile-Cap Elevation on Local Scour Depth around Complex Piers

Local Scour at Complex Bridge Piers in Close Proximity under Clear-Water and Live-Bed Flow Regime

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