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ODOT Structure Project Manager Training
Structure Types
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Common Structure Types
• Pipe culverts– Includes reinforced concrete and
corrugated metal round pipes, reinforced concrete elliptical pipes, and corrugated steel and aluminum pipe arches
– Structural design criteria addressed in Location and Design Manual, Volume 3, Section 1008
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Round Concrete Pipe
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Round Corrugated Steel Pipe
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Elliptical Concrete Pipe
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Common Structure Types (cont’d)
• Box culverts– Includes precast reinforced concrete box
culverts, corrugated steel and aluminum box culverts, and corrugated steel long span culverts
– Not unusual to see concrete box culverts replace small, single span bridges
– Location and Design Manual, Volume 3, Section 1008 for design criteria
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Precast Concrete Box Culvert
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Precast Concrete Box Culvert
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Common Structure Types (cont’d)
• Three sided culverts– Includes precast reinforced concrete flat-
topped culverts and precast reinforced concrete arch sections
– Flat-topped available from 14 to 34 ft. span– Arch available from 12 to 42 ft. span– Location and Design Manual, Volume 3,
Section 1008 for design criteria
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Flat-Topped 3 Sided Culvert
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Flat-Topped 3 Sided Culvert
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Precast Reinforced Concrete Arch
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Precast Reinforced Concrete Arch
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Common Structure Types (cont’d)
• Bridges (Bridge Design Manual, Section 200)– Superstructures consisting of cast-in-place
concrete slabs, prestressed concrete box or I-Beams, and structural steel beams and welded plate girders
– Shallow abutments with spill-though earthslopes are preferred for stream crossings
– Pier type typically depends on what feature is being crossed by bridge
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Cast in Place Slab with Capped Pile Piers
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Concrete Box Beams with Cap and Column Piers and Drilled Shafts
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Rolled Steel Beams with Cap and Column Piers
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Welded Plate Girders with Single Column Piers
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Factors Affecting Structure Type
• Economic considerations• Site constraints• Hydraulic requirements• Subsurface conditions• Maintenance of traffic• Construction time• Utilities (rare)
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Economic Considerations
• General hierarchy of construction costs (least to most expensive)– Pipe culvert– Box culvert– Three sided culvert– Bridge
• Other factors (hydraulics, subsurface conditions, etc.) can outweigh general hierarchy
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Site Constraints
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Maintenance of Traffic
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Limitations on Use of Common Structure Types
• Culverts – Material durability, minimum and maximum cover restrictions, subsurface conditions, structure skew relative to roadway, maintenance of traffic
• Bridge superstructures - Curved roadway alignment, structure skew relative to roadway, required span length, maintenance of traffic