Calculation of Bridge Pier Scour Using the Erodibility Index Method

Annandale, George; Smith, Steven

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Calculation of Bridge Pier Scour Using the Erodibility Index Method

2001-03-01
By Annandale, George ; Smith, Steven

File Language:

English

Details

Creators:

Annandale, George ; Smith, Steven
Corporate Creators:

Golden Associates
Corporate Contributors:

Colorado. Dept. of Transportation. Research Branch ; United States. Federal Highway Administration
Subject/TRT Terms:
Publication/ Report Number:

CDOT-DTD-R-2000-9
Resource Type:

Tech Report
Geographical Coverage:

United States ; Colorado
Edition:

Final Report
Corporate Publisher:

Golden Associates
Abstract:

This report explains the use of the Erodibility Index Method (also known as Annandale's Method) to calculate bridge pier scour. The method can be used to predict scour in any earth material, including rock and cohesive and non-cohesive soils. Earth material properties are represented by a geo-mechanical index that integrates the role of material mass strength, block / particle size, internal shear strength and orientation in quantifying the relative ability of earth material to resist scour. A relationship between the geo-mechanical index and the erosive power of water defines the scour threshold that is used in the scour calculations. By comparing the erosive power that is required to scour an earth material ( obtained from the threshold relationship) with the erosive power that is available at the base of a bridge pier, it is possible to calculate scour depth. The report outlines the methods that are used to quantify the gee-mechanical index and those that are used to estimate the erosive power of water flowing around bridge piers, and explains how to calculate scour depth. Application of the method is illustrated with an example.
Format:

PDF
Funding:

DTFH6 l-90-C-OOOOO
Download URL:

https://rosap.ntl.bts.gov/view/dot/40425/dot_40425_DS1.pdf
File Type:

[PDF - 1.83 MB]
Collection(s):

US Transportation Collection
Main Document Checksum:

urn:sha256:cb8ccb81b2cb06c9d8e3ce86b0feacdda76fb144f8ef0eb69b862057a7c6b09a

File Language:

English

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