LRFD Design Example
December 2003 FHWA NHI-04-041
Steel Girder Superstructure Bridge
FHWA / National Highway Institute Washington, DC
Michael Baker Jr Inc Moon Township, Pennsylvania
Development of a Comprehensive Design Example for a Steel Girder Bridge with Commentary
Design Process Flowcharts for Superstructure and SubstructureDesigns
Prepared by Michael Baker Jr., Inc.
Technical Report Documentation Page
1. 4. Report No. 2. Government Accession No. 3. 5. Recipient’s Catalog No. Report Date
FHWA NHI - 04-041
Title and Subtitle
LRFD Design Example for Steel Girder Superstructure Bridge with Commentary
7. Author (s)
6. Performing Organization Code
Raymond A. Hartle,P.E., Kenneth E. Wilson, P.E., S.E., William A. Amrhein, P.E., S.E., Scott D. Zang, P.E., Justin W. Bouscher, E.I.T., Laura E. Volle, E.I.T.
Performing Organization Report No.
B25285 001 0200 HRS
10. 11. 13. Work Unit No. (TRAIS) Contract or Grant No.
Performing Organization Name and Address
Michael Baker Jr., Inc. Airside Business Park, 100 Airside Drive Moon Township, PA15108
12. Sponsoring Agency Name and Address
Type of Report and Period Covered
Federal Highway Administration National Highway Institute (HNHI-10) 4600 N. Fairfax Drive, Suite 800 Arlington, Virginia 22203
15. Supplementary Notes
Final Submission August 2002 - December 2003
14. Sponsoring Agency Code
Baker Principle Investigator: Raymond A. Hartle, P.E. BakerProject Managers: Raymond A. Hartle, P.E. and Kenneth E. Wilson, P.E., S.E. FHWA Contracting Officer’s Technical Representative: Thomas K. Saad, P.E. Team Leader, Technical Review Team: Firas I. Sheikh Ibrahim, Ph.D., P.E.
This document consists of a comprehensive steel girder bridge design example, with instructional commentary based on the AASHTO LRFD Bridge Design Specifications(Second Edition, 1998, including interims for 1999 through 2002). The design example and commentary are intended to serve as a guide to aid bridge design engineers with the implementation of the AASHTO LRFD Bridge Design Specifications, and is offered in both US Customary Units and Standard International Units. This project includes a detailed outline and a series of flowcharts that serve as thebasis for the design example. The design example includes detailed design computations for the following bridge features: concrete deck, steel plate girder, bolted field splice, shear connectors, bearing stiffeners, welded connections, elastomeric bearing, cantilever abutment and wingwall, hammerhead pier, and pile foundations. To make this reference user-friendly, the numbers and titles of thedesign steps are consistent between the detailed outline, the flowcharts, and the design example. In addition to design computations, the design example also includes many tables and figures to illustrate the various design procedures and many AASHTO references. AASHTO references are presented in a dedicated column in the right margin of each page, immediately adjacent to the corresponding designprocedure. The design example also includes commentary to explain the design logic in a user-friendly way. Additionally, tip boxes are used throughout the design example computations to present useful information, common practices, and rules of thumb for the bridge designer. Tips do not explain what must be done based on the design specifications; rather, they present suggested alternatives for thedesigner to consider. A figure is generally provided at the end of each design step, summarizing the design results for that particular bridge element. The analysis that served as the basis for this design example was performed using the AASHTO Opis software. A sample input file and selected excerpts from the corresponding output file are included in this document.
17. Key Words 18. Distribution...
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