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Prestressed Concrete Bridge Girder Design Examples PDF

362 Pages·2006·1.99 MB·English
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Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. FHWA/TX-06/0-4751-1 Vol. 2 4. Title and Subtitle 5. Report Date IMPACT OF LRFD SPECIFICATIONS ON DESIGN OF TEXAS BRIDGES May 2006 VOLUME 2: PRESTRESSED CONCRETE BRIDGE GIRDER DESIGN Published: December 2006 EXAMPLES 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. Mary Beth D. Hueste, Mohammed Safi Uddin Adil, Mohsin Adnan, and Peter B. Report 0-4751-1 Keating 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) Texas Transportation Institute The Texas A&M University System 11. Contract or Grant No. College Station, Texas 77843-3135 P roject 0-4751 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Texas Department of Transportation Technical Report: Research and Technology Implementation Office September 2003-August 2005 P. O. Box 5080 14. Sponsoring Agency Code A ustin, Texas 78763-5080 15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. Project Title: Impact of LRFD Specifications on the Design of Texas Bridges URL: http://tti.tamu.edu/documents/0-4751-1-V2.pdf 16. Abstract The Texas Department of Transportation (TxDOT) is currently designing highway bridge structures using the American Association of State Highway and Transportation Officials (AASHTO) Standard Specifications for Highway Bridges, and it is expected that the agency will transition to the use of the AASHTO LRFD Bridge Design Specifications before 2007. This is a two-volume report that documents the findings of a TxDOT-sponsored research project to evaluate the impact of the Load and Resistance Factor (LRFD) Specifications on the design of typical Texas bridges as compared to the Standard Specifications. The objectives of this portion of the project are to evaluate the current LRFD Specifications to assess the calibration of the code with respect to typical Texas prestressed bridge girders, to perform a critical review of the major changes when transitioning to LRFD design, and to recommend guidelines to assist TxDOT in implementing the LRFD Specifications. A parametric study for AASHTO Type IV, Type C, and Texas U54 girders was conducted using span length, girder spacing, and strand diameter as the major parameters that are varied. Based on the results obtained from the parametric study, two critical areas were identified where significant changes in design results were observed when comparing Standard and LRFD designs. The critical areas are the transverse shear requirements and interface shear requirements, and these are further investigated. In addition, limitations in the LRFD Specifications, such as those for the percentage of debonded strands and use of the LRFD live load distribution factor formulas, were identified as restrictions that would impact TxDOT bridge girder designs, and these issues are further assessed. The results of the parametric study, along with critical design issues that were identified and related recommendations, are summarized in Volume 1 of this report. Detailed design examples for an AASHTO Type IV girder and a Texas U54 girder using both the AASHTO Standard Specifications and AASHTO LRFD Specifications were also developed and compared. Volume 2 of this report contains these examples. 17. Key Words 18. Distribution Statement Prestressed Concrete, LRFD, Design, Bridge Girders, U54 No restrictions. This document is available to the public Girder, Type IV Girder, Type C Girder, Parametric Study through NTIS: National Technical Information Service Springfield, Virginia 22161 http://www.ntis.gov 19. Security Classif.(of this report) 20. Security Classif.(of this page) 21. No. of Pages 22. Price Unclassified Unclassified 362 Form DOT F 1700.7 (8-72) Reproduction of completed page authorized IMPACT OF LRFD SPECIFICATIONS ON DESIGN OF TEXAS BRIDGES VOLUME 2: PRESTRESSED CONCRETE BRIDGE GIRDER DESIGN EXAMPLES by Mary Beth D. Hueste, P.E. Associate Research Engineer Texas Transportation Institute Mohammed Safi Uddin Adil Graduate Research Assistant Texas Transportation Institute Mohsin Adnan Graduate Research Assistant Texas Transportation Institute and Peter B. Keating Associate Research Engineer Texas Transportation Institute Report 0-4751-1 Project Number 0-4751 Project Title: Impact of LRFD Specifications on Texas Bridges Performed in Cooperation with the Texas Department of Transportation and the Federal Highway Administration May 2006 Published: December 2006 TEXAS TRANSPORTATION INSTITUTE The Texas A&M University System College Station, Texas 77843-3135 DISCLAIMER The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official view or policies of the Federal Highway Administration (FHWA) or the Texas Department of Transportation (TxDOT). While every effort has been made to ensure the accuracy of the information provided in this report, this material is not intended to be a substitute for the actual codes and specifications for the design of prestressed bridge girders. This report does not constitute a standard, specification, or regulation; and is not intended for constructing, bidding, or permit purposes. The engineer in charge was Mary Beth D. Hueste, P.E. (TX 89660). v ACKNOWLEDGMENTS This research was conducted at Texas A&M University (TAMU) and was supported by TxDOT and FHWA through the Texas Transportation Institute (TTI) as part of Project 0-4751, “Impact of LRFD Specifications on Design of Texas Bridges.” The authors are grateful to the individuals who were involved with this project and provided invaluable assistance, including Rachel Ruperto (TxDOT, Research Project Director), David Hohmann (Research Project Coordinator), Gregg Freeby (TxDOT), John Holt (TxDOT), Mark Steves (TxDOT), John Vogel (TxDOT), and Dennis Mertz (University of Delaware). Special thanks go to Richard Gehle (TAMU), who provided valuable assistance in the final formatting of this report. v i TABLE OF CONTENTS Page Appendix A.1: Design Example for Interior AASHTO Type IV Girder using AASHTO Standard Specifications ............................................................A.1-i Appendix A.2: Design Example for Interior AASHTO Type IV Girder using AASHTO LRFD Specifications..................................................................A.2-i Appendix B.1: Design Example for Interior Texas U54 Girder using AASHTO Standard Specifications...............................................................................B.1-i Appendix B.2: Design Example for Interior Texas U54 Girder using AASHTO LRFD Specifications....................................................................................B.2-i vi i Appendix A.1 Design Example for Interior AASHTO Type IV Girder using AASHTO Standard Specifications A.1 - i

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Detailed design examples for an AASHTO Type IV girder and a. Texas U54 girder using both Prestressed Concrete, LRFD, Design, Bridge Girders, U54. Girder, Type IV Girder, .. DUCTILITY LIMITS 57. A.1.10.1 Maximum Reinforcement.
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