Localized Scour at Bridge Piers on Graded Particle Streambeds PDF Download
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Author: Howard D. Copp
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 50
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Book Description
This document reports on results of research to develop a method for estimating depth of local scour at bridge piers that would provide an improved estimate from current methodology, i.e., one (or more) based on sand bed streams.
Author: Howard D. Copp
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 50
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Book Description
This document reports on results of research to develop a method for estimating depth of local scour at bridge piers that would provide an improved estimate from current methodology, i.e., one (or more) based on sand bed streams.
Author: R. Ettema
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 527
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Book Description
Author: Jueyi Sui
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0
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Book Description
A precise prediction of maximum scour depth (MSD) around piers under ice-covered conditions is crucial for the safe design of the bridge foundation. Due to the lack of information for local scour under ice-covered flow condition, it is extremely hard to give proper estimation of MSD. In the current study, a set of flume experiments were completed to investigate local scour around four pairs of circular bridge piers with nonuniform bed materials under open channel, smooth and rough ice cover conditions. Three different bed materials with median particle size of 0.47, 0.50, and 0.58 mm were used to simulate natural river conditions. Regardless of pier size, the maximum scour depths were observed in front of the piers under all flow conditions. Additionally, a smaller pier size and a larger space between piers yield a smaller scour depth. Results showed that the maximum scour depth decreases with increase in the grain size of armor layer. The distribution of vertical velocity shows that the strength of downfall velocity is the greatest under rough ice cover. Empirical equations were developed to estimate the maximum scour depth around side-by-side bridge piers under both open-channel and ice-covered flow conditions.
Author: K. S. Jackson
Publisher:
ISBN:
Category : Scour at bridges
Languages : en
Pages : 98
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Book Description
Scour data collected during 1989-1994 were evaluated to determine whether pier scour and contraction scour occurred at 22 bridge sites in Ohio. Pier-scour depths computed from selected pier-scour prediction equations were compared with measured pier-scour depths, and the accuracy of the prediction equations were evaluated. Observed pier-scour relations were compared to similar relations developed through laboratory research. Mean streambed elevations were evaluated to determine the depth of contraction scour. Channel stability was assessed by use of mean streambed elevations at the approach section. Ground-penetrating radar was used at all sites to investigate the presence of historical scour.
Author: Kaleem Afzal
Publisher:
ISBN: 9783346109507
Category :
Languages : en
Pages : 56
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Book Description
Bachelor Thesis from the year 2019 in the subject Physics - Mechanics, University of Engineering & Technology Peshawar, language: English, abstract: The objective of the study is to conduct laboratory model testing to investigate and compare scour hole depth of the diamond, square and elliptical scaled model of bridge piers in a cohesion less bedding material under clear water and to propose the most efficient cross section of the bridge pier, having less Local scour around piers under steady clear-water condition was studied experimentally for a variety of configuration, including different sizes and shapes of piers. Total number of forty experiments were performed in the flume using diamond, square and elliptical shape. The scouring around the square shape was found maximum and at elliptical shape was the least. The main reason was obstruction in flow area that was more in case of the square and less in case of the elliptical shape. However, the diamond shaped has the intermediate scouring under same condition. Local scour is a complex phenomenon involving three-dimensional flow, typically developed around piers founded in movable bed rivers. Local scour can lead to partial failure or to collapse of bridge piers because of the high flood velocity. The cost of large bridges, with common and special complex piers, justifies carrying out an accurate prediction of scour depth, for both economic and safety reasons, which in turn leads to the interest of hydraulic engineers in predicting the equilibrium scour depth.
Author: Howard D. Copp
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 34
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Book Description
Author: Howard D. Copp
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 80
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Book Description
Author: Donald C. Hayes
Publisher:
ISBN:
Category : Scour at bridges
Languages : en
Pages : 44
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Book Description
Author: Peter Frederick Lagasse
Publisher: Transportation Research Board
ISBN: 0309118344
Category : Technology & Engineering
Languages : en
Pages : 177
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Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Report 653: Effects of Debris on Bridge Pier Scour explores guidelines to help estimate the quantity of accumulated, flow event debris, based on the density and type of woody vegetation and river bank condition upstream and analytical procedures to quantify the effects of resulting debris-induced scour on bridge piers. The debris photographic archive, the survey questionnaire and list of respondents, and the report on the field pilot study related to development of NCHRP 653 was published as NCHRP Web-Only Document 148: Debris Photographic Archive and Supplemental Materials for NCHRP Report 653.
Author: B. W. Melville
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 298
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Book Description
