Bridge Design Manual – June 2020 Oregon Department of Transportation Section 1 – Design Standards 1-1 Table of Contents 1.1 Section 1 – Introduction ............................................................................................................ 5 1.2 Bridge Design, General ............................................................................................................. 6 1.2.1 Bridge Design Standards ........................................................................................................ 6 1.2.2 Bridge Design Deviations and Design Exceptions .................................................................. 7 1.2.3 Bridge Design Deliverables ..................................................................................................... 8 1.2.4 Bridge Design Procedures ...................................................................................................... 9 1.3 Loads and Distributions .......................................................................................................... 10 1.3.1 Dead Loads ........................................................................................................................... 10 1.3.2 Live Loads ............................................................................................................................. 11 1.3.3 Sidewalk Loading .................................................................................................................. 16 1.3.4 Vehicular Collision Forces: CT .............................................................................................. 17 1.3.5 Change in Foundations Due to Limit State for Scour ............................................................ 20 1.3.6 Thermal Forces ..................................................................................................................... 20 1.3.7 Wind Load ............................................................................................................................. 20 1.4 Structural Analysis .................................................................................................................. 21 1.4.1 Ductility, Redundancy and Operational Importance (LRFD 1.3.3, 1.3.4 & 1.3.5) ................. 21 1.4.2 Shear Correction Factor for Skewed Girders ........................................................................ 21 1.5 Concrete.................................................................................................................................... 22 1.5.1 Concrete, General ................................................................................................................. 22 1.5.2 Concrete Finish ..................................................................................................................... 23 1.5.3 Concrete Bonding Agents ..................................................................................................... 25 1.5.4 Curing Concrete .................................................................................................................... 25 1.5.5 Reinforcement ....................................................................................................................... 26 1.5.6 Precast Prestressed Concrete Elements .............................................................................. 45 1.5.7 Cast-In-Place Superstructure ................................................................................................ 56 1.5.8 Post-Tensioned Structures .................................................................................................... 61 1.5.9 Camber Diagrams ................................................................................................................. 69 1.5.10 Pour Schedules ................................................................................................................. 71 1.6 Steel Structure Design and Detailing ..................................................................................... 75 1.6.1 Steel Girders.......................................................................................................................... 75 1.6.2 Welding................................................................................................................................ 104 1.6.3 Galvanizing and Painting..................................................................................................... 109 1.6.4 Bolts and Connections ........................................................................................................ 113 1.7 Aluminum............................................................................................................................... 114 1.7.1 Aluminum............................................................................................................................. 114 1.8 Timber Bridge Design and Detailing ................................................................................... 115 1.8.1 Timber Bridge Locations ..................................................................................................... 115 1.8.2 Timber Design and Details .................................................................................................. 115 1.8.3 Timber Connections ............................................................................................................ 116 1.8.4 Timber Rails ........................................................................................................................ 116 1.8.5 Preservative Treatments ..................................................................................................... 116 1.8.6 Field Installation................................................................................................................... 116 1.9 Decks ....................................................................................................................................... 117 1.9.1 Design and Detailing ........................................................................................................... 117 1.9.2 Deck Screeding ................................................................................................................... 128 1.9.3 Deck Construction Joints ..................................................................................................... 129 1.9.4 Deck Overlays ..................................................................................................................... 130
Bridge Design Manual – June 2020
Apr 28, 2023
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