Lateral Analysis Guidelines for Drilled Shafts in Nevada Based on LRFD Framework (NDOT 608-17-803)

The AASHTO LRFD specifications from 2014, the AASHTO 2015 and 2016 interim revisions, and the AASHTO LRFD Seismic Guide Specifications, offer only vague guidance on the lateral stability requirements and analytical modeling techniques for deep foundations. Deep foundations consist of two primary types: drilled shafts and driven piles. Due to the extensive research involved in studying both of these deep foundation types, this research project is focused solely on drilled shafts. In determining the lateral resistance of deep foundations, AASHTO recommends the use of p-y curves, or strain-wedge theory, in order to model the load-deflection behavior of soil. Simplified methods for analytically modeling deep foundations exist; however, these methods have their limitations and drawbacks. Several state Departments of Transportation have developed improved guidelines for the design of deep foundations under lateral loads; unfortunately, these guidelines are not compatible with the design practice in Nevada regarding the shaft diameter. In order to account for local soil conditions, design practices, and foundation dimensions commonly encountered within the state of Nevada, the Nevada Department of Transportation (NDOT) must develop design guidelines containing appropriate recommendations for lateral analysis and lateral stability. A reliable method is needed to ensure accurate, economical, and safe deep foundation designs, specifically relating to drilled shafts; the method must also ensure uniformity in the design approach, while achieving the desired lateral performance. Since it is critical for NDOT to develop a robust and enhanced design methodology to carry out LRFD of large diameter drilled shafts, the objective of this research is to develop a design guide for LRFD of drilled shafts under lateral loading.

Language

• English

Project

• Status: Active
• Funding: $295,891.00
• Contract Numbers:

  608-17-803

• Sponsor Organizations:

  Federal Highway Administration

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

  Nevada Department of Transportation

  1263 South Stewart Street
  Carson City, NV  United States  89712
• Managing Organizations:

  Nevada DOT Research

  1263 South Stewart St
  Carson City, Nevada  United States  89712
• Project Managers:

  Taylor, Michael

  Koury, Lucy

• Performing Organizations:

  University of Nevada, Reno

  1664 N. Virginia Street
  Reno, Nevada  United States  89557
• Principal Investigators:

  Motamed, Ramin

• Start Date: 20171207
• Expected Completion Date: 20220731
• Actual Completion Date: 0
• USDOT Program: Transportation, Planning, Research, and Development
• Subprogram: Bridge Safety

Subject/Index Terms

• TRT Terms: Bridge design; Bridge foundations; Load and resistance factor design; Methodology
• Identifier Terms: AASHTO LRFD Bridge Design Specifications
• Geographic Terms: Nevada
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways;

Filing Info

• Accession Number: 01653349
• Record Type: Research project
• Source Agency: Nevada Department of Transportation
• Contract Numbers: 608-17-803
• Files: RIP
• Created Date: Dec 11 2017 2:54PM