Scour Depth Determination of Bridge Piers Based on Time-Varying Modal Parameters: Application to Hangzhou Bay Bridge

Scour is a phenomenon that causes riverbed erosion. Many laboratory studies have been conducted to identify the complex geometry of the scour mechanism and to predict its depth, and various methods have been proposed. In this study, the performance of these methods in estimating scour depth was evaluated using field data. For this purpose, scour data on the Adinan Bridge, which was destroyed as a result of the scour phenomenon and consequently rebuilt, was collected. The bridge was built with complex piers. The flow and sediment characteristics for the bridge site were determined using field measurement. Then, the pier scour was calculated using the empirical formula and the calculated values were compared with the recorded data. The results showed the inefficiency of these methods in accurately estimating the scour depth. However, the role of the components of a composite pier has not been reflected properly in the determination of scour in these methods.

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Numerical and analytical determination of compact thermal modal parameters

Bulletin de la Société des Sciences et des Lettres de Łódź Série Recherches sur les Déformations ◽

10.26485/0459-6854/2017/67.2/10 ◽

2017 ◽

Vol 67 (2) ◽

Keyword(s):

Modal Parameters ◽

Analytical Determination

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A hybrid analytical-numerical method based on Isogeometric Analysis for determination of time varying gear mesh stiffness

Mechanism and Machine Theory ◽

10.1016/j.mechmachtheory.2021.104291 ◽

2021 ◽

Vol 160 ◽

pp. 104291

Author(s):

Andreas Beinstingel ◽

Michael Keller ◽

Michael Heider ◽

Burkhard Pinnekamp ◽

Steffen Marburg

Keyword(s):

Numerical Method ◽

Isogeometric Analysis ◽

Time Varying ◽

Mesh Stiffness ◽

Gear Mesh ◽

Gear Mesh Stiffness

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Evaluation of Selected Pier-Scour Equations Using Field Data

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198196152300123 ◽

1996 ◽

Vol 1523 (1) ◽

pp. 186-195 ◽

Cited By ~ 3

Author(s):

Mark N. Landers ◽

David S. Mueller

Keyword(s):

Field Measurements ◽

Bridge Piers ◽

Critical Ratio ◽

Scour Depth ◽

Flow Depth ◽

Clear Water ◽

Pier Scour ◽

Logarithmic Space ◽

State Highway ◽

Federal Highway

Field measurements of channel scour at bridges are needed to improve the understanding of scour processes and the ability to accurately predict scour depths. An extensive data base of pier-scour measurements has been developed over the last several years in cooperative studies between state highway departments, the Federal Highway Administration, and the U.S. Geological Survey. Selected scour processes and scour design equations are evaluated using 139 measurements of local scour in live-bed and clear-water conditions. Pier-scour measurements were made at 44 bridges around 90 bridge piers in 12 states. The influence of pier width on scour depth is linear in logarithmic space. The maximum observed ratio of pier width to scour depth is 2.1 for piers aligned to the flow. Flow depth and scour depth were found to have a relation that is linear in logarithmic space and that is not bounded by some critical ratio of flow depth to pier width. Comparisons of computed and observed scour depths indicate that none of the selected equations accurately estimate the depth of scour for all of the measured conditions. Some of the equations performed well as conservative design equations; however, they overpredict many observed scour depths by large amounts. Some equations fit the data well for observed scour depths less than about 3 m (9.8 ft), but significantly underpredict larger observed scour depths.

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Analysis of Scour Depth Around Bridge Piers With Round Nose Shape by HEC-RAS 5.0.7 Software

Journal of Physics Conference Series ◽

10.1088/1742-6596/1764/1/012151 ◽

2021 ◽

Vol 1764 (1) ◽

pp. 012151

Author(s):

C S Silvia ◽

M Ikhsan ◽

A Wirayuda ◽

Mastiar

Keyword(s):

Bridge Piers ◽

Scour Depth ◽

Nose Shape

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Hybrid Scour Depth Prediction Equations for Reliable Design of Bridge Piers

Water ◽

10.3390/w13152019 ◽

2021 ◽

Vol 13 (15) ◽

pp. 2019

Author(s):

Hossein Hamidifar ◽

Faezeh Zanganeh-Inaloo ◽

Iacopo Carnacina

Keyword(s):

Flow Velocity ◽

Critical Velocity ◽

Depth Estimation ◽

Hybrid Models ◽

Velocity Estimation ◽

Bridge Piers ◽

Critical Flow ◽

Scour Depth ◽

Critical Flow Velocity ◽

Estimation Equations

Numerous models have been proposed in the past to predict the maximum scour depth around bridge piers. These studies have all focused on the different parameters that could affect the maximum scour depth and the model accuracy. One of the main parameters individuated is the critical velocity of the approaching flow. The present study aimed at investigating the effect of different equations to determine the critical flow velocity on the accuracy of models for estimating the maximum scour depth around bridge piers. Here, 10 scour depth estimation equations, which include the critical flow velocity as one of the influencing parameters, and 8 critical velocity estimation equations were examined, for a total combination of 80 hybrid models. In addition, a sensitivity analysis of the selected scour depth equations to the critical velocity was investigated. The results of the selected models were compared with experimental data, and the best hybrid models were identified using statistical indicators. The accuracy of the best models, including YJAF-VRAD, YJAF-VARN, and YJAI-VRAD models, was also evaluated using field data available in the literature. Finally, correction factors were implied to the selected models to increase their accuracy in predicting the maximum scour depth.

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Core depth determination of a slightly buried Si-wire waveguide with a reduced bend loss

Japanese Journal of Applied Physics ◽

10.35848/1347-4065/ac06b4 ◽

2021 ◽

Author(s):

Tatsuya Aso ◽

Takehiro Ishiguro ◽

Junji Yamauchi ◽

Hisamatsu Nakano

Keyword(s):

Depth Determination ◽

Core Depth

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Comparison between the circular and square collar in reduction of local scouring around bridge piers

E3S Web of Conferences ◽

10.1051/e3sconf/20184003002 ◽

2018 ◽

Vol 40 ◽

pp. 03002 ◽

Cited By ~ 1

Author(s):

Saeed Reza Khodashenas ◽

Hossain Shariati ◽

Kazem Esmaeeli

Keyword(s):

Bridge Piers ◽

Scour Depth ◽

Circular Shape ◽

Level Elevation

In this study operation of two types of circular and square collars has been investigated on a single cylindrical pier. The results showed that using of these two types of collars cause to reduction of scour depth especially under the bed level (elevation). This research showed that the square collar is more effective than circular shape in decreasing of the scour depth). The square and circular collars showed 70% and 50% decrease in rate of scour depth, respectively in compared with simple pier without collar.

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