Subtraction Approach to Experimentally Assess the Contribution of the Complex Pier Components to the Local Scour Depth

Moreno, Mario; Maia, Rodrigo; Couto, Lúcia; Cardoso, António H.

doi:10.1061/(asce)hy.1943-7900.0001270

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…First investigations of scour at complex bridge piers were done by Jones and Sheppard [15]. Other studies of scour at complex bridge piers have been done [16][17][18][19][20][21][22][23][24][25][26]. However, none above research investigated the influence of pier skewness, which is a significant issue.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pile-Cap Elevation and Skewness on Clear Water Scour at Complex Bridge Piers

Hussein¹,

Shukur²,

Majeed³

2023

MMEP

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In this paper, laboratory tests were used to determine the effects of skewness and pilecap elevation on the local scour of complex bridge piers. The 1:50 scale river models represent the Beta complex bridge piers in Babylon Province and the Ali Al-Gharbi complex bridge piers in Missan Province. The model pier consists of circular columns, rectangular pile-cap, and 2×4 array of circular piles below for the Beta Bridge and 2×3 array of circular piles below for the Missan Bridge. Four different skew-angles (=0°, 30°, 45°, 60°) and pile-cap elevations corresponding to bed level are used. All experiments are conducted for twenty-four hours. Results suggest that locations of scour start, and maximum scour depth may be different, and that their relationship is dependent on pile-cap elevation and pier skew angle. Maximum equilibrium scour depth for aligned complex piers occurs when bottom of pile cap is above original bed level; for skewed complex piers, maximum equilibrium scour depth is much larger. Increase in depth of scouring is proportional to skew angle. Sensitivity of scour development to pier skew angle increases as pile-cap elevation increases, particularly when it is fully above original bed.

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Section: Introductionmentioning

confidence: 99%

Influence of Pile-Cap Elevation and Skewness on Clear Water Scour at Complex Bridge Piers

Hussein¹,

Shukur²,

Majeed³

2023

MMEP

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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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“…They found that scour depth is depending on many parameters and exactly proportional to the approach flow velocity. Also, lots of efforts in terms of experimental [13,17,22,23,25], analytical [21] and numerical [14][15]20,24] were made towards development of scour depth formula. They found that current scour prediction methods are not suitable as they do not consider the complex nature of the scour formation mechanism.…”

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confidence: 99%

Experimental, Analytical, and Numerical Evaluation of Bridge Pier Scouring

Kadam,

Dawari

2024

Civil and Environmental Engineering

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Due to the rising number of incidents of bridge failure, scouring around bridges has received a lot of attention. Accurate scour depth prediction is a challenge for researchers and experts, despite massive global research efforts. Estimation the scour depth is crucial for both a safety and economy. Numerous factors affect the scour depth. In this work, the scour depth of three distinct pier geometries – circular, oblong, and rectangular – is thoroughly investigated, and the effect of water depth and discharge on the scour depth of a given geometry is evaluated. Three pier shapes were the subject of a total of 27 trials, nine of which combined three discharges with varying flume water depth. Experimental observation of scour depth shows good agreement with analytical and numerical scour depth values. A comparative examination of analytical, experimental, and numerical findings indicates that numerical models can effectively estimate scour depth, offering a cost-effective and time-saving methodology. Results showed that circular and oblong pier geometry shows lesser scour depth than rectangular pier geometry for a specific combination of flow depth and discharge. Scour depth decreased with increasing flume water depth for the same discharge. For the constant flume water depth, higher discharge results in greater scour depth.

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Subtraction Approach to Experimentally Assess the Contribution of the Complex Pier Components to the Local Scour Depth

Cited by 6 publications

References 11 publications

Influence of Pile-Cap Elevation and Skewness on Clear Water Scour at Complex Bridge Piers

Influence of Pile-Cap Elevation and Skewness on Clear Water Scour at Complex Bridge Piers

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

Experimental, Analytical, and Numerical Evaluation of Bridge Pier Scouring

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