Service Limit State Design for Bridges (R19B)

The existing Load and Resistance Factor Design (LRFD) Bridge Design Specifications are federally mandated for all bridge designs in the United States using federal funds. The SHRP2 product, Service Limit State Design for Bridges (R19B), identified the service limit states that can be statically calibrated to produce uniform performance with the goal of generating a 100-year design life for bridges. The SHRP2 research has produced a calibration process that can be adjusted and applied to any limit state. The calibration of current limit states resulted in proposed revisions to the LRFD Specifications that may alter how bridges are designed across the country. Several of the proposed revisions have already been adopted by AASHTO’s Subcommittee on Bridges and Structures (SCOBS). These adopted revisions are now part of the AASHTO LRFD Specifications and the federal rule.

• Reports
  • Implementation Report: Expanded Database for Service Limit State Calibration of Immediate Settlement of Bridge Foundations on Soil
  • Incorporation of Foundation Movements in AASHTO LRFD Bridge Design Process, Second Edition
  • Status of Implementation of SHRP2 Specifications to the AASHTO LRFD: Recommendations from Service Limit State Design for Foundations
  • Revisions to the specifications that have already been incorporated: (all below are included in the single link)
    • Service III, Tension in Prestressed Concrete Components
    • Fatigue of Structural Steel and Reinforcement
    • Commentary on Deflection
    • Commentary on Service II Limit State
  • Bridges for Service Life Beyond 100 Years: Service Limit State Design TRB Report
  • Bridges Beyond 100 Years: Innovative Systems (R19B) TRB Webinar
  • Service Limit State Design for Bridges Fact Sheet
  • Final Implementation Report
• Web-Based Training and Additional Training
  • Incorporation of Foundation Movements in AASHTO LRFD Bridge Design Process, National Highway Institute Course No. NHI-132100
  • Service Limit State Design for Bridges (R19B) Training Course, FHWA Western Federal Lands, July 19-20, 2017
  • Service Limit State Design for Bridges (R19B) Training Course, FHWA Central Federal Lands, May 23-24, 2017
  • Service Limit State Design for Bridges (R19B) Training Course, FHWA Eastern Federal Lands, June 27-28, 2017

• Incorporation of Foundation Deformations in AASHTO LRFD Bridge Design Process, Naresh C. Samtani, NCS GeoResources, 42nd Annual Southwest Geotechnical Engineering Conference, Tempe, AZ, May 1-4, 2017
• Service Limit State Design for Foundations: Impact on Bridge Designs, Naresh Samtani, NCS GeoResources, LLC, and John M. Kulicki, PhD, PE Modjeski and Masters, Inc. AASHTO Subcommittee on Bridges and Structures T-15 Substructures and Retaining Walls Committee, June 28, 2016
• Service Limit State Design for Bridges: Background Information on the Proposed Geotechnical Revisions to AASHTO LRFD, Naresh Samtani, NCS GeoResources, LLC, and John M. Kulicki, PhD, PE Modjeski and Masters, Inc. AASHTO Subcommittee on Bridges and Structures (SCOBS) Mid-Year Meeting, Oct. 28, 2015
• Service Limit State Design for Bridges: Implementation Planning Workshop, Wagdy G. Wassef, AECOM, AASHTO Subcommittee on Bridges and Structures (SCOBS) Mid-Year Meeting, Oct. 28, 2015
• Calibration of Service Limit States for Concrete in AASHTO LRFD Bridge Design Specifications, Wagdy G. Wassef et. al., International Bridge conference, 2016.

• Federal Lands Highway used Service Limit State Design for Bridges through the Implementation Assistance Program (IAP). They received User Incentive awards through Round 7 of the IAP.

• Silas Nichols (FHWA) Silas.Nichols@dot.gov

• FHWA Service Limit State Design for Bridges Web Page