Configuration Optimization of Drilled Shafts Supporting Bridge Structures: Three Case Studies

A common approach to estimating the point of fixity is to utilize the results of a single pile lateral analysis. Although no universal agreement exists as to the definition of the location of the point of fixity, it is generally accepted that its location will affect the computed stresses and displacements of a bridge structure. This study summarizes a method to determine a cantilever’s equivalent length of drilled shaft foundation elements supporting a bridge. Results from an equivalent frame model are compared to those for bents modeled using the finite element method and nonlinear soil models for three bridges in North Carolina. Results indicated that the equivalent frame model provides responses that are comparable to those obtained from more rigorous finite element analyses. The study presents the results of the optimization of the support system by reducing the number, or size, of the shafts while maintaining an acceptable level of safety.

• Record URL:
  https://doi.org/10.1061/(ASCE)SC.1943-5576.0000118
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/10840680
• Supplemental Notes:
  • Copyright © 2012 American Society of Civil Engineers
• Authors:
  • Robinson, Brent
  • Suarez, Vinicio
  • Gabr, Mohammed
  • Kowalsky, Mervyn
• Publication Date: 2012-8

Language

• English

Media Info

• Media Type: Digital/other
• Features: References;
• Pagination: pp 93-101
• Serial:
  • Practice Periodical on Structural Design and Construction
  • Volume: 17
  • Issue Number: 3
  • Publisher: American Society of Civil Engineers
  • ISSN: 1084-0680
  • Serial URL: http://ascelibrary.org/loi/ppscfx

Subject/Index Terms

• TRT Terms: Bridge foundations; Bridges; Case studies; Finite element method; Mathematical models
• Uncontrolled Terms: Drilled shafts; Point of fixity
• Geographic Terms: North Carolina
• Subject Areas: Bridges and other structures; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01455866
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Nov 30 2012 5:13PM