Calibrating Side-Resistance Factors of Drilled Shafts in Arizona Cohesionless Soils
The 7th Edition of American Association of State and Highway Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications (2014) contains some significant changes in the analysis for drilled shafts with respect to estimating side resistance. The AASHTO specifications are based on an evaluation of national data. AASHTO encourages owner agencies to develop local resistance factors, calibrated to local geologic conditions based on specific probabilistic, risk-based computational procedures. The current Arizona Department of Transportation (ADOT) specifications are conservative, but the new AASHTO specifications are even more so; using them for ADOT foundations could increase costs by requiring the drilling of longer-than-necessary shafts. Using resistance factors based on Arizona-specific geologic formations will shorten length requirements for drilled shafts and control the related construction costs. The study is using available load testing from Arizona sites and supplementing with axial load test data from other states (such as Nevada) with similar geological conditions to Arizona to develop those local resistance factors for drilled shaft design. To determine potential savings from using those newly developed resistance factors, the study is also gathering drilled shaft cost information from ADOT and other state transportation agencies.
Language
- English
Project
- Status: Active
- Funding: $111,331
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Contract Numbers:
SPR-754
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Sponsor Organizations:
Arizona Department of Transportation
206 South 17th Avenue
Phoenix, AZ United States 85007Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Managing Organizations:
Arizona Department of Transportation
206 South 17th Avenue
Phoenix, AZ United States 85007 -
Project Managers:
Stone, William
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Performing Organizations:
School of Sustainable Engineering and the Built Environment, ASU
650 E. Tyler Mall, Rm 112
Arizona State University
Tempe, AZ United States 85287-3005 -
Principal Investigators:
Kavazanjian, Edward
van Paassen, Leon
- Start Date: 20180619
- Expected Completion Date: 20201231
- Actual Completion Date: 0
Subject/Index Terms
- TRT Terms: Axial loads; Bridge anchorages; Bridge design; Cohesionless materials; Foundation soils; Load and resistance factor design; Load tests; Resistance (Mechanics)
- Identifier Terms: American Association of State Highway and Transportation Officials
- Geographic Terms: Arizona
- Subject Areas: Bridges and other structures; Construction; Highways;
Filing Info
- Accession Number: 01615645
- Record Type: Research project
- Source Agency: Arizona Department of Transportation
- Contract Numbers: SPR-754
- Files: RiP, STATEDOT
- Created Date: Oct 31 2016 12:41PM