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Chapter
Mar 17, 2015

Streamlining of Bridge Pier as a Scour Countermeasure: A Feasibility Study

Abstract

Scour around bridge pier is known as one of the most critical causes to bridge failure. Countermeasures suggested by HEC-23 (2009) include riprap, gabions, spurs, guide banks, and so on. The principals of these countermeasures are either mechanically stabilizing the channel bed surface to prevent the development of the scour hole, or reducing the vortex intensity. Streamlining of the piers is a potentially feasible countermeasure to bridge scour by reducing the vortex strength. In this paper, Computational Fluid Dynamics (CFD) models are developed to evaluate the feasibility of streamlining as a countermeasure. Five test cases with different streamlining features are systematically analyzed and compared. It is found that the vertical profile of the pier nose and sidewalls has significant effects on the development of vortex structures around piers. Streamlined pier nose and sidewalls help reduce the downward flow in front of the piers, the vortex extent around the pier and the bed shear stress intensity. If the pier is not aligned with the incoming flow, however, the effectiveness of streamlining as a scour countermeasure may be highly compromised.

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Published In

Go to IFCEE 2015
IFCEE 2015
Pages: 319 - 329

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Published online: Mar 17, 2015

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Junhong Li
Graduate Research Assistant, Department of Civil Engineering, University of Akron, OH 44325.
Junliang Tao [email protected]
A.M.ASCE
Assistant Professor, Department of Civil Engineering, University of Akron, OH 44325 (corresponding author). E-mail: [email protected]
Xiong (Bill) Yu
M.ASCE
Associate Professor, Department of Civil Engineering, Case Western Reserve University, Cleveland OH 44106.

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