Reliability-Based Geotechnical Resistance Factors for Axially-Loaded Micropiles

Micropile foundations consist of small-diameter (typically less than 12 inches) drilled and grouted non-displacement, reinforced elements. Such foundations can be constructed in situations of low-headroom, restricted-access, obstructions, and vibration-sensitive sites. However, current micropile foundation design does not incorporate rational reliability-based geotechnical resistance factors, and many state departments of transportation do not have sufficient data or resources to do such calibrations. There was a need to identify the parameters that influence the resistance factors for micropile foundations and develop reliability-based geotechnical resistance factors and specifications that can be used for various design and construction methods. These factors and accompanying specifications should provide an increased level of confidence in the design and help highway agencies in making decisions regarding the use of micropile foundations. The objective of this research was to develop reliability-based geotechnical resistance factors for axially-loaded micropiles and related specifications.

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4180

Language

• English

Project

• Status: Completed
• Funding: $249998
• Contract Numbers:

  Project 04-40

• Sponsor Organizations:

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001

  American Association of State Highway and Transportation Officials (AASHTO)

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

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Project Managers:

  Hanna, Amir

• Performing Organizations:

  University of Missouri, Columbia

  Columbia, MO  United States  65211
• Principal Investigators:

  Loehr, J

• Start Date: 20170901
• Expected Completion Date: 20200430
• Actual Completion Date: 20200430
• Source Data: RiP Project 40799

Subject/Index Terms

• TRT Terms: Bridge design; Bridge foundations; Data collection; Load and resistance factor design; Load tests; Resistance (Mechanics); Shaft sinking; Soil structure interaction; State departments of transportation
• Subject Areas: Bridges and other structures; Data and Information Technology; Geotechnology; Highways;

Filing Info

• Accession Number: 01598918
• Record Type: Research project
• Source Agency: Transportation Research Board
• Contract Numbers: Project 04-40
• Files: TRB, RIP
• Created Date: May 9 2016 11:00AM