Bridge scour is the loss of soil by erosion due to water flowing around bridge supports. Scour has been the number one cause of bridge failure in the United States with an average annual rate of 22 bridges collapsing or being closed due to severe deformation. The current bridge design code suggests engineers to use the resistance factor of 1 in the foundation design for extreme conditions. This paper aims to modify the resistance factor in the foundation design in the case of pier scour using reliability theory. First, a set of database is used to quantify the statistical parameters associated with the scatter between the predicted and measured pier scour depth and the probability that a deterministically predicted pier scour depth will be exceeded. The database is also used to provide the bias factors in current predictions. In the second part these statistical parameters are used to develop a reliability-based load and resistance factor design for shallow and deep foundations subjected to scour. The goal is to provide a design procedure where the reliability of the foundation is the same with or without scour.
LRFD Calibration of Bridge Foundations Subjected to Scour
Geo-Congress 2014
LRFD Calibration of Bridge Foundations Subjected to Scour
Abstract
Chapter Authors:
Geotechnical Engineer, Parsons Brinckerhoff, 401 B Street, Wells Fargo Plaza, Suite 1650, San Diego, CA 92101, USA. E-mail: [email protected]
Professor, Holder of the Buchanan Chair, Zachry Department of Civil Engineering, Texas A&M University, College Station, Texas 77843-3136, USA. E-mail: [email protected]
Associate Professor, Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, 205 N. Mathews Ave., Urbana, IL 61801, USA. E-mail: [email protected]
Book Title: Geo-Congress 2014: Geo-characterization and Modeling for Sustainability
Published online: March 25, 2014
Geo-Congress 2014
February 23-26, 2014 | Atlanta, Georgia
© 2014 American Society of Civil Engineers