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The National Academies

SHRP 2 R19(B) [Completed]

Bridges for Service Life Beyond 100 Years: Service Limit State Design

  Project Data
Funds: $999,990
Research Agency: Modjeski and Masters, Inc.
Principal Investigator: John Kulicki
Effective Date: 9/3/2008
Completion Date: 12/31/2013

Project snapshot. More details below.

Products
(Project Number)
Impact on Practice
Product Status
BRIDGES FOR SERVICE LIFE BEYOND 100 YEARS: SERVICE LIMIT STATE DESIGN (R19B)

Service Life Guide Specification and Framework provides new design codes for standard bridges based on service limit state. The companion tool kit includes data sets related to durability, fatigue, fracture, and redundancy as integral issues of service life; performance measures; and comprehensive design procedures leading to longer and more predictable service life.
When individual bridge components, such as bridge bearings, deck joints, and columns and piles deteriorate at different rates, bridges can be closed for repair far too often. Designing bridge components and systems to service limit states extends the service life of the entire structure, yields significant savings through reduced maintenance and, by reducing road closures, reduces safety risks for workers and road users.
Portions of this work will be incorporated into the AASHTO Bridge Specifications. The Service Life Guide will continue to be developed under AASHTO guidance. The final report is available at http://www.trb.org/Main/Blurbs/170201.aspx.  The tool kit is forthcoming. 
 
Staff Responsibility: Jerry DiMaggio
 
SHRP 2 Project R19B is part of a suite of projects designed to increase the service life of bridges.
 
The objectives of this project were to
  • Develop new design codes that incorporate a rational approach based on service limit state (SLS) for durability and performance of bridge systems, subsystems, components, and details that are critical to reaching the expected service life and assuring an actual life beyond 100 years. Special focus was given to problematic systems, subsystems, components, and details. The proposed SLS includes data sets related to durability, fatigue, fracture, and redundancy as integral issues of service life as reported in SHRP 2 Project R19A.
  • Develop performance measures, incorporating predefined component classifications that will utilize full probability-based service life design criteria to maximize the actual life of the system, considering material performance (including durability), structural performance of systems, subsystems, and components (optimum joints and bearings), and design practices leading to longer and more predictable service life.
  • Develop comprehensive design procedures, proposed specification changes, and implementation tools that include durability design in addition to structural design. In the conduct of this development, structural and material redundancy, and system, subsystem, and component performance measures that will utilize service life design criteria to maximize the actual life of the system were considered.
The products of this study are expected to be directly usable by American Association of State Highway and Transportation Officials (AASHTO) and the Departments of Transportation (DOTs), and include provisions needed to implement service limit states and the associated load and resistance factors necessary to produce calibrated bridge components and systems expected to have a predictable service life; detailed design and detailing provisions required to design and construct the calibrated component or system; and databases used in the calibration as well as instructions for a calibration spreadsheet for use by DOTs to track and adjust service-based reliability with time.

 

Status: The project is complete.

 

Product Availability: A prepublication draft of the final report, Bridges for Service Life Beyond 100 Years: Service Limit State Design, was published in January 2014.  It is available as an Adobe PDF.  A fact sheet and project brief are also available.  The tool kit is forthcoming.

 

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This page was last modified on February 4, 2014.

 

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