Load and Resistance Factor Design (LRFD) for Highway Bridge
Transcript Of Load and Resistance Factor Design (LRFD) for Highway Bridge
Publication No. FHWA-NHI-15-058 April 2007 Revised August 2015
NHI Course No. 130081
Load and Resistance Factor Design (LRFD) for
Highway Bridge Superstructures
DESIGN EXAMPLES
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1. Report No.
2. Government Accession No.
FHWA-NHI-15-058
4. Title and Subtitle
Load and Resistance Factor Design (LRFD) for Highway Bridge
Superstructures – Design Examples
Technical Report Documentation Page
3. Recipient’s Catalog No.
FHWA-NHI-15-058
5. Report Date
August 2015
6. Performing Organization Code
FHWA/DTS-NHI-1
7. Author (s)
Original Steel Design Example – Kenneth E. Wilson, P.E., S.E., Justin W. Bouscher, P.E., William A. Amrhein, P.E., S.E.
Original Prestressed Concrete Design Example – Modjeski and Masters, Inc.
8. Performing Organization Report No.
MBDE137804
9. Performing Organization Name and Address
10. Work Unit No. (TRAIS)
Michael Baker International
Airside Business Park, 100 Airside Drive
11. Contract or Grant No.
Moon Township, PA 15108
DTFH61-11-D-00046
12. Sponsoring Agency Name and Address
13. Type of Report and Period Covered
Federal Highway Administration National Highway Institute (HNHI-10)
Final Submission May 2015 – August 2015
1310 North Courthouse Road
14. Sponsoring Agency Code
Arlington, VA 22201
FHWA
15. Supplementary Notes
Baker Principle Investigator: Mary P. Rosick, P.E. Baker Project Manager: Scott D. Vannoy, P.E. FHWA Contracting Officer’s Representative: Louisa M. Ward FHWA Technical Team Leader: Brian M. Kozy, Ph.D., P.E.
16. Abstract
This document provides two comprehensive superstructure design examples for the application of Load and Resistance Factor Design (LRFD) to highway bridge design. One design example is a two-span steel plate girder bridge, and the other is a two-span prestressed concrete girder bridge with simple span prestressed girders made continuous for live load. These design examples accompany a four-day training course that presents the theory, methodology, and application for the design and analysis of both steel and concrete highway bridge superstructures. The design examples, as well as the training course, are based on the AASHTO LRFD Bridge Design Specifications, Seventh Edition, 2014, with Interim Revisions through 2015.
The first design example includes a series of flowcharts that present the general design steps required for the design of a steel plate girder bridge. The flowcharts include references to the AASHTO LRFD Bridge Design Specifications, as well as accompanying notes to assist the bridge engineer in understanding the various design steps. This design example also includes six major design steps that illustrate the application of these design procedures. The six major design steps included in this design example are general information, deck design, steel girder design, splice design, miscellaneous steel design, and bearing design.
The second design example also includes a series of flowcharts that present the general design steps required for the design of prestressed concrete superstructure bridges. This design example includes five major design steps. The design steps included are general information, deck design, prestressed concrete girder design, bearing design, and substructure design (integral abutment and intermediate pier and foundation design). (It should be noted that the substructure design steps are based on a previous version of AASHTO LRFD Bridge Design Specifications and have not been updated.)
The design examples include references to AASHTO LRFD Bridge Design Specifications, commentary to assist the bridge engineer in understanding its application, and a variety of figures and tables to supplement the narrative and calculations.
17. Key Words
18. Distribution Statement
Bridge Design, Load and Resistance Factor Design, LRFD, Superstructure, Deck, Girder, Structural Steel, Reinforced Concrete, Prestressed Concrete, Bearing, Limit State, Load Combination, Analysis
This report is available to the public from the NHI Bookstore at http://www.nhi.fhwa.dot.gov/training/nhistore.aspx
19. Security Classif. (of this report)
Unclassified Form DOT F 1700.7 (8-72)
20. Security Classif. (of this page)
21. No. of Pages 22. Price
Unclassified
630
Reproduction of completed page authorized
ACKNOWLEDGEMENTS
We would like to express appreciation to the following individuals who served on the Technical Review Team:
Brandon W. Chavel, Ph.D., P.E. HDR Engineering, Inc.
Gerald B. Lacosta Sevatec, Inc.
We would like to acknowledge the contributions of the following staff members at Michael Baker International during the update of the design examples:
Rachel A. Sharp. P.E. Aaron B. Colorito, P.E. David J. Foremsky, P.E. Francesco M. Russo, Ph.D., P.E. Eric M. Wickersham Gregory M. Willenkin, E.I.T.
We would also like to acknowledge the contributions of the following individuals during the update of the design examples:
Michael A. Grubb, P.E. M.A. Grubb and Associates
William N. Nickas, P.E. Precast/Prestressed Concrete Institute
Finally, we would like to acknowledge the contributions of the following individuals to the original edition of this document:
Staff members of Michael Baker International: Raymond A. Hartle, P.E. Tracey A. Anderson Jeffrey J. Campbell, P.E. James A. Duray, P.E. Maureen Kanfoush Herman Lee, P.E. Joseph R. McKool, P.E. Linda Montagna V. Nagaraj, P.E. Jorge M. Suarez, P.E. Laura E. Volle, P.E. Roy R. Weil Ruth J. Williams
FHWA Project Oversight: Thomas K. Saad, P.E.
FHWA Technical Review Team Leader: Firas I. Sheikh Ibrahim, Ph.D., P.E.
Other technical support: John A. Corven, P.E. Dann H. Hall
Load and Resistance Factor Design (LRFD) for
Highway Bridge Superstructures
STEEL DESIGN EXAMPLE
This page intentionally left blank.
Table of Contents
Flowcharts Chart 1 Chart 2 Chart 3 Chart 4 Chart 5 Chart 6
Design Example Design Step 1 Design Step 2 Design Step 3 Design Step 4 Design Step 5 Design Step 6
General Information Flowchart Concrete Deck Design Flowchart Steel Girder Design Flowchart Bolted Field Splice Design Flowchart Miscellaneous Steel Design Flowchart Bearing Design Flowchart
General Information Deck Design Steel Girder Design Splice Design Miscellaneous Steel Design Bearing Design
This page intentionally left blank.
Flowcharts
Design Example for a Two-Span Bridge
General Information Flowchart Chart 1
FHWA LRFD Steel Design Example
1
Flowcharts
Design Example for a Two-Span Bridge
General Information Flowchart (Continued) Chart 1
FHWA LRFD Steel Design Example
2
NHI Course No. 130081
Load and Resistance Factor Design (LRFD) for
Highway Bridge Superstructures
DESIGN EXAMPLES
This page intentionally left blank.
1. Report No.
2. Government Accession No.
FHWA-NHI-15-058
4. Title and Subtitle
Load and Resistance Factor Design (LRFD) for Highway Bridge
Superstructures – Design Examples
Technical Report Documentation Page
3. Recipient’s Catalog No.
FHWA-NHI-15-058
5. Report Date
August 2015
6. Performing Organization Code
FHWA/DTS-NHI-1
7. Author (s)
Original Steel Design Example – Kenneth E. Wilson, P.E., S.E., Justin W. Bouscher, P.E., William A. Amrhein, P.E., S.E.
Original Prestressed Concrete Design Example – Modjeski and Masters, Inc.
8. Performing Organization Report No.
MBDE137804
9. Performing Organization Name and Address
10. Work Unit No. (TRAIS)
Michael Baker International
Airside Business Park, 100 Airside Drive
11. Contract or Grant No.
Moon Township, PA 15108
DTFH61-11-D-00046
12. Sponsoring Agency Name and Address
13. Type of Report and Period Covered
Federal Highway Administration National Highway Institute (HNHI-10)
Final Submission May 2015 – August 2015
1310 North Courthouse Road
14. Sponsoring Agency Code
Arlington, VA 22201
FHWA
15. Supplementary Notes
Baker Principle Investigator: Mary P. Rosick, P.E. Baker Project Manager: Scott D. Vannoy, P.E. FHWA Contracting Officer’s Representative: Louisa M. Ward FHWA Technical Team Leader: Brian M. Kozy, Ph.D., P.E.
16. Abstract
This document provides two comprehensive superstructure design examples for the application of Load and Resistance Factor Design (LRFD) to highway bridge design. One design example is a two-span steel plate girder bridge, and the other is a two-span prestressed concrete girder bridge with simple span prestressed girders made continuous for live load. These design examples accompany a four-day training course that presents the theory, methodology, and application for the design and analysis of both steel and concrete highway bridge superstructures. The design examples, as well as the training course, are based on the AASHTO LRFD Bridge Design Specifications, Seventh Edition, 2014, with Interim Revisions through 2015.
The first design example includes a series of flowcharts that present the general design steps required for the design of a steel plate girder bridge. The flowcharts include references to the AASHTO LRFD Bridge Design Specifications, as well as accompanying notes to assist the bridge engineer in understanding the various design steps. This design example also includes six major design steps that illustrate the application of these design procedures. The six major design steps included in this design example are general information, deck design, steel girder design, splice design, miscellaneous steel design, and bearing design.
The second design example also includes a series of flowcharts that present the general design steps required for the design of prestressed concrete superstructure bridges. This design example includes five major design steps. The design steps included are general information, deck design, prestressed concrete girder design, bearing design, and substructure design (integral abutment and intermediate pier and foundation design). (It should be noted that the substructure design steps are based on a previous version of AASHTO LRFD Bridge Design Specifications and have not been updated.)
The design examples include references to AASHTO LRFD Bridge Design Specifications, commentary to assist the bridge engineer in understanding its application, and a variety of figures and tables to supplement the narrative and calculations.
17. Key Words
18. Distribution Statement
Bridge Design, Load and Resistance Factor Design, LRFD, Superstructure, Deck, Girder, Structural Steel, Reinforced Concrete, Prestressed Concrete, Bearing, Limit State, Load Combination, Analysis
This report is available to the public from the NHI Bookstore at http://www.nhi.fhwa.dot.gov/training/nhistore.aspx
19. Security Classif. (of this report)
Unclassified Form DOT F 1700.7 (8-72)
20. Security Classif. (of this page)
21. No. of Pages 22. Price
Unclassified
630
Reproduction of completed page authorized
ACKNOWLEDGEMENTS
We would like to express appreciation to the following individuals who served on the Technical Review Team:
Brandon W. Chavel, Ph.D., P.E. HDR Engineering, Inc.
Gerald B. Lacosta Sevatec, Inc.
We would like to acknowledge the contributions of the following staff members at Michael Baker International during the update of the design examples:
Rachel A. Sharp. P.E. Aaron B. Colorito, P.E. David J. Foremsky, P.E. Francesco M. Russo, Ph.D., P.E. Eric M. Wickersham Gregory M. Willenkin, E.I.T.
We would also like to acknowledge the contributions of the following individuals during the update of the design examples:
Michael A. Grubb, P.E. M.A. Grubb and Associates
William N. Nickas, P.E. Precast/Prestressed Concrete Institute
Finally, we would like to acknowledge the contributions of the following individuals to the original edition of this document:
Staff members of Michael Baker International: Raymond A. Hartle, P.E. Tracey A. Anderson Jeffrey J. Campbell, P.E. James A. Duray, P.E. Maureen Kanfoush Herman Lee, P.E. Joseph R. McKool, P.E. Linda Montagna V. Nagaraj, P.E. Jorge M. Suarez, P.E. Laura E. Volle, P.E. Roy R. Weil Ruth J. Williams
FHWA Project Oversight: Thomas K. Saad, P.E.
FHWA Technical Review Team Leader: Firas I. Sheikh Ibrahim, Ph.D., P.E.
Other technical support: John A. Corven, P.E. Dann H. Hall
Load and Resistance Factor Design (LRFD) for
Highway Bridge Superstructures
STEEL DESIGN EXAMPLE
This page intentionally left blank.
Table of Contents
Flowcharts Chart 1 Chart 2 Chart 3 Chart 4 Chart 5 Chart 6
Design Example Design Step 1 Design Step 2 Design Step 3 Design Step 4 Design Step 5 Design Step 6
General Information Flowchart Concrete Deck Design Flowchart Steel Girder Design Flowchart Bolted Field Splice Design Flowchart Miscellaneous Steel Design Flowchart Bearing Design Flowchart
General Information Deck Design Steel Girder Design Splice Design Miscellaneous Steel Design Bearing Design
This page intentionally left blank.
Flowcharts
Design Example for a Two-Span Bridge
General Information Flowchart Chart 1
FHWA LRFD Steel Design Example
1
Flowcharts
Design Example for a Two-Span Bridge
General Information Flowchart (Continued) Chart 1
FHWA LRFD Steel Design Example
2