LRFD Design Manual

Design Manual

Updated on October 7, 2026

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LRFD Design ManualCommentary
Preface (124.49 KB) .pdf Commentary (211.65 KB) .pdf
1. General Design (647.49 KB) .pdf Commentary (410.86 KB) .pdf
2. Sustainable Bridge Design (427.03 KB) .pdf  
3. Preliminary Design of Bridges (950.5 KB) .pdf Commentary (7.77 MB) .pdf
4. Preliminary Design of Culverts (540.8 KB) .pdf Commentary (5 MB) .pdf
5. Bridge Superstructure Design
5.1 General (141.14 KB) .pdf  
5.2 Deck (675.54 KB) .pdf Commentary (350.08 KB) .pdf
5.3 Haunch (431.28 KB) .pdf Commentary (169.32 KB) .pdf
5.4 Pretensioned Prestressed Concrete Girder (696.96 KB) .pdf Commentary (239.8 KB) .pdf
5.5 Steel Girder (532.64 KB) .pdf Commentary (351.37 KB) .pdf
5.6 Concrete Slab (306.64 KB) .pdf Commentary (105.95 KB) .pdf
5.7 Bearings (376.49 KB) .pdf Commentary (107.34 KB) .pdf
5.8 Additional Components    
5.8.1 Railings (1.84 MB) .pdf Commentary (437.95 KB) .pdf
Bridge Rail Guide (60.16 MB) .pdf
5.8.2 Pedestrian facilities (120.29 KB) .pdf  
5.8.3 Expansion Joint (305.08 KB) .pdf Commentary (239.42 KB) .pdf
5.8.4 Deck Drains (162.32 KB) .pdf Commentary (1.39 MB) .pdf
5.8.5 Reinforcement protection (211.09 KB) .pdf Commentary (115.88 KB) .pdf
5.8.6 Approach Slabs (183.47 KB) .pdf  
6. Bridge Substructure Design
6.1 General (247.73 KB) .pdf  
6.2 Piles (685.25 KB) .pdf Commentary (462.79 KB) .pdf
LRFD Pile Design Examples (2.92 MB) .pdf

LRFD workshop on bridge foundations consisting of driven piles in Iowa
6.3 Drilled Shafts (203.85 KB) .pdf Commentary (124.44 KB) .pdf
6.4 Spread Footings (219.81 KB) .pdf Commentary (108.66 KB) .pdf
6.5 Abutments (712.01 KB) .pdf Commentary (299.56 KB) .pdf
6.6 Piers (966.83 KB) .pdf Commentary (372.11 KB) .pdf
Appendix for Technical Documents (687.81 KB) .pdf
6.7 Retaining walls (193.67 KB) .pdf  
7. Culverts (4.7 MB) .pdf Commentary (154.89 KB) .pdf
Precast Barrel Design Methodology (442.51 KB) .pdf
8. Accelerated Bridge Construction (571.89 KB) .pdf  
9. Bridge Aesthetics (5.42 MB) .pdf Commentary (194.11 KB) .pdf
10. Special Structures
10.2 Sign Supports ASD/LFD manual section (272.33 KB) .pdf Commentary (166 KB) .pdf
11. Falsework Design (383.22 KB) .pdf Commentary (180.98 KB) .pdf
12. Bridge and Culvert Inspection, Rating and Repair
12.1 Bridge Repair (497.44 KB) .pdf Commentary (833.98 KB) .pdf
13. CADD Notes (689.77 KB) .pdf Commentary (201.39 KB) .pdf

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