Research for AASHTO Standing Committee on Highways. Task 183. LRFD Foundation Design Implementation and Specification Development

It is well recognized that the current AASHTO LRFD specifications for deep foundations (Chapter 10) are in serious need of updating. As a first step, NCHRP project 24-17 was conducted to begin addressing some of the current problems in that chapter, but primarily focused on the gathering of deep foundation data and the performance of calibrations to improve the resistance factors needed for deep foundation design. The results from NCHRP Project 24-17, as well as other recently completed LRFD calibration work on deep foundations, must be incorporated or adapted to fit within the AASHTO LRFD specifications, and Chapter 10 needs to be rewritten to make it consistent with the design practice as described in the AASHTO Standard Specifications 17th edition. The rewriting of Chapter 10 is currently nearing completion through an FHWA contract, and the final steps in producing an agenda item for balloting will be undertaken by the AASHTO T-15 Technical Committee this year in preparation for submitting a formal ballot at the 2005 Bridge Subcommittee meeting. Through the recently completed review of Chapter 10, it has been discovered that the method for calculating drilled shaft resistance needs to be updated to the methodology provided in the updated FHWA manual on drilled shafts (O'Neil and Reese, 1999). The objective of this study is to develop and populate a database for the behavior of single deep foundation elements under static load such that the measured strength and the parameters for the calculation of the nominal strength are readily available. The database will permit efficient computation of deep foundation resistance leading to simplification of the resistance factor calibration process.

• Record URL:
  http://www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=1209

Language

• English

Project

• Status: Completed
• Funding: $65000.00
• Contract Numbers:

  Project 20-07, Task

• Sponsor Organizations:

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  American Association of State Highway and Transportation Officials (AASHTO)

  444 North Capitol Street, NW
  Washington, DC  United States  20001

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001
• Project Managers:

  Beal, David

• Performing Organizations:

  Geosciences Testing and Research Incorporated

  55 Middlesex Street, Suite 225
  North Chelmsford, MA  United States  01863-
• Principal Investigators:

  Paikowsky, Samuel

• Start Date: 20041029
• Expected Completion Date: 0
• Actual Completion Date: 20051231
• Source Data: RiP Project 11708

Subject/Index Terms

• TRT Terms: Databases; Design; Foundations; Implementation; Research projects; Specifications; Static loads
• Identifier Terms: National Cooperative Highway Research Program
• Subject Areas: Bridges and other structures; Data and Information Technology; Design; Highways; I30: Materials;

Filing Info

• Accession Number: 01462954
• Record Type: Research project
• Source Agency: National Cooperative Highway Research Program
• Contract Numbers: Project 20-07, Task
• Files: RIP, USDOT
• Created Date: Jan 3 2013 2:13PM