Stream Simulation Design Process - USDA Forest Service

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Backfill, Settlement and Foundations Controlled compaction is required, specify backfill and bedding according to the manufacturers recommendations. Generally requires a low plasticity, granular material, easily compacted to prevent damage to culvert for excessive force and vibration effects. settlement “squishing effect” rigid foundation drag forces increased bending stress settlement neutral effect flexible foundation structure settles too, no extra stress AASHTO
Bearing Capacity & failure modes pipe arch/footing • Bearing Capacity of pipe is 2-4* open bottom arch. • Pipes must fail through entire height of fill – seldom a concern. Settlement is a more likely phenomena. • OBA footings designed to develop to reduce load to what soil can carry. depth & width are key. • It is imperative to prevent scour below the footing design depth. – long profile Zone of vulnerability, A minimum embedment depth is required to develop foundation bearing capacity in soil.
Page 1 and 2:
Stream Simulation Design Process As
Page 3 and 4:
Stream Simulation How big is it?
Page 5 and 6: Culvert Size 1. Based on Project Ob
Page 7 and 8: Bed profile elevation; average of m
Page 9 and 10: Stream Simulation - gentle gradient
Page 11 and 12: Stream Simulation culvert width •
Page 13 and 14: Stream Simulation culvert width b.
Page 15 and 16: Design for sustainability, especial
Page 17 and 18: The same stream simulation can usua
Page 19 and 20: Pipes • Maximum embedment = where
Page 21 and 22: Barnard
Page 23 and 24: Box Standard Arch Arches (embedment
Page 25 and 26: Bankfull width structure after 16 y
Page 27 and 28: Bridge Structures Wood: Glue lamina
Page 29 and 30: Bridges are beautiful, but don’t
Page 31 and 32: A Much Better Bridge Nice! Hey, aqu
Page 33 and 34: Geometry & Fit Considerations • R
Page 35 and 36: Structure shape versus channel shap
Page 37 and 38: Structure shape versus channel shap
Page 39 and 40: High and Low Profile Structures Low
Page 41 and 42: Bottomless Arch Miscellaneous Place
Page 43 and 44: COSTS $160,000 $140,000 $120,000 $1
Page 45 and 46: Changing from 8’ open bottom arch
Page 47 and 48: Durability - Abrasion Abrasion rate
Page 49 and 50: “Normal” Corrosion & Abrasion i
Page 51 and 52: 1. For 16 gage galvanized steel, th
Page 53 and 54: The minimum adequate structural thi
Page 55: Foundation Conditions and Slope Sta
Page 59 and 60: Footing Shapes for Open Bottom Arch
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Stream Simulation Design Process - USDA Forest Service

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