WisDOT Bridge Manual Chapter 17 – Superstructure - General July 2021 17-1 Table of Contents 17.1 Design Method ................................................................................................................. 3 17.1.1 Design Requirements ............................................................................................... 3 17.1.2 Rating Requirements ................................................................................................ 3 17.1.2.1 Standard Permit Design Check ......................................................................... 3 17.2 LRFD Requirements ........................................................................................................ 4 17.2.1 General..................................................................................................................... 4 17.2.2 WisDOT Policy Items ................................................................................................ 4 17.2.3 Limit States............................................................................................................... 4 17.2.3.1 Strength Limit State........................................................................................... 4 17.2.3.2 Service Limit State ............................................................................................ 5 17.2.3.3 Fatigue Limit State ............................................................................................ 5 17.2.3.4 Extreme Event Limit State ................................................................................. 6 17.2.4 Design Loads ........................................................................................................... 6 17.2.4.1 Dead Loads ...................................................................................................... 6 17.2.4.2 Traffic Live Loads.............................................................................................. 8 17.2.4.2.1 Design Truck ............................................................................................. 8 17.2.4.2.2 Design Tandem ......................................................................................... 9 17.2.4.2.3 Design Lane .............................................................................................. 9 17.2.4.2.4 Double Truck ............................................................................................. 9 17.2.4.2.5 Fatigue Truck .......................................................................................... 10 17.2.4.2.6 Live Load Combinations .......................................................................... 10 17.2.4.3 Multiple Presence Factor ................................................................................ 11 17.2.4.4 Dynamic Load Allowance ................................................................................ 12 17.2.4.5 Pedestrian Loads ............................................................................................ 12 17.2.5 Load Factors .......................................................................................................... 13 17.2.6 Resistance Factors ................................................................................................. 13 17.2.7 Distribution of Loads for Slab Structures ................................................................. 14 17.2.8 Distribution of Loads for Girder Structures .............................................................. 24 17.2.9 Distribution of Dead Load to Substructure Units ..................................................... 37 17.2.10 Distribution of Live Loads to Substructure Units.................................................... 37 17.2.11 Composite Section Properties .............................................................................. 39 17.2.12 Allowable Live Load Deflection ............................................................................. 40
Chapter 17 – Superstructure - General
May 07, 2023
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