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Design Example: Three-Span Continuous Curved I-Girder Beam Bridge  Design Example:Archived Three-Span Continuous Curved Tub-Girder Bridge

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Design Example: Three-Span Continuous Curved I-Girder Beam Bridge  Design Example:Archived Three-Span Continuous Curved Tub-Girder Bridge U.S. Department of Transportation Federal Highway Administration Steel Bridge Design Handbook Design Example 3: Three-Span Continuous Horizontally Curved Composite Steel I-Girder Bridge ArchivedPublication No. FHWA-IF-12-052 - Vol. 23 November 2012 Notice This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for use of the information contained in this document. This report does not constitute a standard, specification, or regulation. Quality Assurance Statement The Federal Highway Administration provides high-quality information to serve Government, industry, and the publicArchived in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement. Steel Bridge Design Handbook Design Example 3: Three-Span Continuous Horizontally Curved Composite Steel I-Girder Bridge Publication No. FHWA-IF-12-052 – Vol. 23 November 2012 Archived Archived Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient’s Catalog No. FHWA-IF-12-052 – Vol. 23 4. Title and Subtitle 5. Report Date Steel Bridge Design Handbook Design Example 3: Three-Span November 2012 Continuous Horizontally Curved Composite Steel I-Girder Bridge 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. Julie Rivera, P.E. and Brandon Chavel, Ph.D., P.E. 9. Performing Organization Name and Address 10. Work Unit No. HDR Engineering, Inc. 11 Stanwix Street 11. Contract or Grant No. Suite 800 Pittsburgh, PA 15222 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Office of Bridge Technology Technical Report Federal Highway Administration March 2011 – November 2012 1200 New Jersey Avenue, SE Washington, D.C. 20590 14. Sponsoring Agency Code 15. Supplementary Notes 16. Abstract Horizontally curved steel bridges present many unique challenges. Despite their challenges, curved girder bridges have become widespread and are commonly used at locations that require complex geometries and have limited right-of-way, such as urban interchanges. Some of the important issues that differentiate curved steel girders from their straight counterparts include the effects of torsion, flange lateral bending, their inherent lack of stability, and special constructibility concerns. Also, the complex behavior of horizontally curved bridges necessitates the consideration of system behavior in the analysis. This design example illustrates the design calculations for a curved steel I-girder bridge, considering the Strength, Service, fatigue and Constructibility Limits States in accordance with the AASHTO LRFD Bridge Designs specifications. Calculations are provided for design checks at particular girder locations, a bolted field splice design, a cross frame member design, shear connector design, and a bearing stiffener design. 17. Key Words 18. Distribution Statement Curved I-Girder Bridge, Bridge Design, LRFD, No restrictions. This document is available to the public through Constructibility, Bolted Field Splice, Cross Frame the National Technical Information Service, Springfield, VA Archived22161. 19. Security Classif. (of this report) 20. Security Classif. (of this page) 21. No of Pages 22. Price Unclassified Unclassified Form DOT F 1700.7 (8-72) Reproduction of completed pages authorized Archived Steel Bridge Design Handbook Design Example 3: Three-Span Continuous Horizontally Curved Composite Steel I-Girder Bridge Table of Contents LIST OF FIGURES ....................................................................................................................... vi LIST OF TABLES ........................................................................................................................ vii FOREWORD .................................................................................................................................. 1 1.0 INTRODUCTION ................................................................................................................. 3 2.0 OVERVIEW OF LRFD ARTICLE 6.10 ............................................................................... 5 3.0 DESIGN PARAMETERS ..................................................................................................... 7 4.0 GENERAL STEEL FRAMING CONSIDERATIONS ......................................................... 8 4.1 Span Arrangement ........................................................................................................... 8 4.2 Girder Spacing ................................................................................................................. 8 4.3 Girder Depth .................................................................................................................... 9 4.4 Cross-Section Proportions ............................................................................................... 9 4.5 Cross Frames .................................................................................................................. 11 4.6 Field Section Sizes ......................................................................................................... 12 5.0 FINAL DESIGN .................................................................................................................. 15 5.1 AASHTO LRFD Limit States ........................................................................................ 15 5.1.1 Service Limit State (Articles 1.3.2.2 and 6.5.2).................................................... 15 5.1.2 Fatigue and Fracture Limit State (Articles 1.3.2.3 and 6.5.3) .............................. 15 5.1.3 Strength Limit State (Articles 1.3.2.4 and 6.5.4) .................................................. 15 5.1.4 Constructibility Limit State .................................................................................. 15 5.1.5 ExtremeArchived Event Limit State (Articles 1.3.2.5 and 6.5.5) ........................................ 16 5.2 Loads .............................................................................................................................. 16 5.2.1 Noncomposite Dead Load..................................................................................... 16 5.2.2 Deck Placement Sequence .................................................................................... 16 5.2.3 Superimposed Dead Load ..................................................................................... 16 i 5.2.4 Future Wearing Surface ........................................................................................ 19 5.2.5 Live Load .............................................................................................................. 19 5.3 Centrifugal Force Computation ..................................................................................... 20 5.4 Load Combinations ........................................................................................................ 22 6.0 ANALYSIS .......................................................................................................................... 24 6.1 Three-Dimensional Finite Element Analysis ................................................................. 25 6.1.1 Bearing Orientation ............................................................................................... 25 6.1.2 Live Load Analysis ............................................................................................... 26 6.2 Analysis Results ............................................................................................................. 26 7.0 DESIGN ............................................................................................................................... 36 7.1 General Design Considerations...................................................................................... 36 7.1.1 Flanges .................................................................................................................. 36 7.1.2 Webs ..................................................................................................................... 36 7.1.3 Shear Connectors .................................................................................................. 36 7.1.4 Details (Stiffeners, Cross Frames, Fatigue Categories) ........................................ 37 7.1.5 Wind Loading ....................................................................................................... 38 7.1.5.1 Loading ............................................................................................... 38 7.1.5.2 Analysis............................................................................................... 38 7.1.5.3 Construction ........................................................................................ 39 7.1.6 Steel Erection ........................................................................................................ 39 7.1.7 Deck Placement Sequence .................................................................................... 39 7.2 Section Properties .......................................................................................................... 40 7.2.1 Section G4-1 Properties – Span 1 Positive Moment ............................................
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