Large Diameter Drilled Shafts: Load Testing and Numerical Analysis for Bridge Foundation Design

Bridge foundation design has progressed towards larger diameter and longer drilled shafts in recent years, pushing the practical limits of construction. Load testing can lead to reliable foundation performance with shorter piles, helping to reduce cost and mitigate construction issues associated with unnecessarily long piles. A case study of an Osterberg load test program on a 10-ft (3-m) diameter 140-ft (43-m) long drilled shaft is presented. Results from the load test are used to determine final pile lengths for the project. A reduction of about 25 ft (7.6 m) or more is achieved per pile compared with lengths determined using conventional methods, providing cost savings, and improved constructability. Relatively simple numerical modeling tools are demonstrated to provide useful information during design and construction. Beam-spring models with side resistance (t-z) and end bearing (q-z) springs developed based on the load test illustrate the overall pile capacity within a displacement-based design framework. Axis-symmetric finite element (FE) models are calibrated using load test data and extended to address top-down loading and effects of potential anomalies on the pile capacity.

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  • Supplemental Notes:
    • © 2018 American Society of Civil Engineers.
  • Corporate Authors:

    American Society of Civil Engineers

    New York, New York  United States 
  • Authors:
    • Wilson, Patrick
    • Brown, Eric
    • Law, Hubert
    • Koo, John C
  • Conference:
    • IFCEE 2018
    • Location: Orlando Florida, United States
    • Date: 2018-3-5 to 2018-3-10
  • Publication Date: 2018-6


  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 395-408
  • Monograph Title: IFCEE 2018: Installation, Testing, and Analysis of Deep Foundations

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Filing Info

  • Accession Number: 01682973
  • Record Type: Publication
  • ISBN: 9780784481578
  • Files: TRIS, ASCE
  • Created Date: Oct 4 2018 4:55PM