STRUCTURAL CAPACITY REDUCTION FOR DRILLED SHAFTS WITH MINOR FLAWS

In the last decade, use of drilled shafts has increased due to their cost-effectiveness, versatility, and minimal environmental impact compared with other types of deep foundations. The construction process, however, sometimes introduces minor flaws that are not always detectable with well-performed nondestructive evaluation (NDE) processes. The construction method, working environment, and visibility of the end product for drilled shafts are different from those of an element in the superstructure, yet most structural designers typically attempt to ensure safety in both types of elements using the same resistance factors. This paper summarizes results of a comprehensive series of research projects involving flawed drilled shafts and investigates the frequency of occurrence of flaws that will not normally be detected by well-executed NDE programs. The results from this study present capacity reduction factors corresponding to worst-case scenarios. These factors should be refined using a probabilistic approach to formulate realistic resistance factors to be used in the structural design of drilled shafts considering the presence of undetectable minor flaws.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846957
• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Sarhan, H A
  • O'Neill, M W
  • Tabsh, S W
• Publication Date: 2004-5

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 291-297
• Serial:
  • ACI Structural Journal
  • Volume: 101
  • Issue Number: 3
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-3241
  • Serial URL: http://www.concrete.org/PUBS/JOURNALS/SJHOME.ASP

Subject/Index Terms

• TRT Terms: Bearing capacity; Bridge foundations; Bridge piers; Defects; Foundation engineering; Pile foundations; Resistance (Mechanics); Structural design; Support piles
• Uncontrolled Terms: Drilled shafts
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00973907
• Record Type: Publication
• Files: TRIS
• Created Date: May 11 2004 12:00AM