BrMUG SD Bridge Inventory Statistics Number of NBIS Structures in - - PDF document

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BrMUG SD Bridge Inventory Statistics Number of NBIS Structures in - - PDF document

Oct 26, 2023 206 likes •491 views

September 16, 2014 BrMUG SD Bridge Inventory Statistics Number of NBIS Structures in SD (As of March 2014) 1797 State Owned (SDDOT) Structures 1260 bridges 537 culverts 3953 Local Government Structures 3145 bridges 808

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SLIDE 1

September 16, 2014

BrMUG

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SLIDE 2

SD Bridge Inventory Statistics

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SLIDE 3

Number of NBIS Structures in SD (As of March 2014)

1797 State Owned (SDDOT) Structures

– 1260 bridges – 537 culverts

3953 Local Government Structures

– 3145 bridges – 808 culverts

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SLIDE 4

State vs. Local Government Inventory (LG)

  • Number: LG bridges, about twice as many
  • Deck Area: State bridges, about 1-1/2 times

as much

  • Traffic: State bridges, about six times more
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SLIDE 5

State vs. Local Government Inventory (LG)

Sq Ft of Deck Area of Bridges 60% 40% State LGA

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SLIDE 6

Typical State Owned Bridge

  • About 8,300 sq ft
  • About 210 ft long by 40 ft wide
  • Average year built is 1970
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SLIDE 7

Bridge Age Distribution

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SLIDE 8
  • Misc. Bridge Info
  • Longest Bridge –

– Platte-Winner bridge on SD 44 – 5656 ft long and 171,354 sq ft of deck area

  • 7 Missouri River Bridges in SDDOT Inventory

– Total 904,621 sq ft of deck area – Average length = 3,350 feet long – Account for about 9% of state bridges by deck area

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SLIDE 9

Platte – Winner Bridge

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SLIDE 10

Condition Status of South Dakota Bridges

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SLIDE 11

Bridge Condition Measures

  • NBIS Federal Sufficiency Rating
  • Deficiency Classification (Structurally

Deficient / Functionally Obsolete)

  • Health Index
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SLIDE 12

Federal Sufficiency Rating

89.7 89.5 88.4 88.6 89.1 89.6 89.3 89.7 89.4 89.5 90.6 80 82 84 86 88 90 92 94 96 98 100 2002 2004 2006 2008 2010 2012 2014 2016

Sufficiency Rating Year

Average Sufficiency Rating Index - State Bridges

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SLIDE 13

4% 5% 91%

Structurally Deficient Functionally Obsolete Not Deficient

Deficiency – State Owned

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SLIDE 14

Structural Deficiency

206 206 144 119 127 104 89 86 74 73 69 79 85 68 50 100 150 200 250 2000 2002 2004 2006 2008 2010 2012 2014 2016

Number of Structurally Deficient Structures (SDDOT Owned)

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SLIDE 15

Structural Deficiency

  • MAP-21 requires NHS bridges to have less

than 10% by deck area to be Structurally Deficient

– SDDOT is at 4.4%

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SLIDE 16

50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 100.0 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Health Index (0 - 100)

Health Index

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SLIDE 17

SD Bridge Management

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SLIDE 18

Bridge Project Priorities

  • Protection of bridge deck/slabs
  • Minimize risk – scour countermeasures
  • Waterproof Joints
  • Upgrade bridge rail for safety
  • Replace or repair deteriorated elements
  • Replace structures when needed
  • Coordination with mainline projects
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SLIDE 19

Bridge Preservation Practices

  • Rigid concrete overlay program for decks with

black resteel (ongoing since 70’s)

  • Deck joint retrofitting to eliminate or better

waterproof existing joints (also since 70’s)

  • Routine deck crack sealing (epoxy)
  • Thin polymer deck overlays (typically two coats
  • f epoxy with broadcast aggregate)
  • Fatigue retrofitting of category E details on steel

superstructures

  • Patching and protection of substructure units
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SLIDE 20

New Bridge Design Longevity Practices

  • Jointless deck design with integral

abutments (ongoing since 70’s)

  • Increased top clear cover (2 ½”) and use of

ECR type deck resteel (since late 70’s)

  • Silane sealer deck application @

completion of construction

  • Stainless and dual coated rebar (metalized +

epoxy coated) considered on limited basis

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SLIDE 21

Bridge Project Programming

  • Inspector recommendations
  • Region/Area recommendations
  • Guidelines based upon proven standard

bridge preservation practices

  • Bridge Management System (BMS)

recommendations

  • Coordination with other projects for timing
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SLIDE 22

Bridge Programming Considerations

  • Balance work/needs with available funds
  • Coordinate with grading/surfacing projects
  • Cost effectiveness of structure work
  • Life cycle cost analysis methods
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SLIDE 23

Programmed Spending Levels (average per year on State structures)

  • Interstate 3R – varies around $8 - 10 million
  • Bridge Program - $15.5 million

– Includes structure replacement, rehabilitation and preservation projects

  • Other - Variable depending on number of

structures included in grading and resurfacing projects.

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SLIDE 24

BMS Capabilities (Pontis/BrM)

  • Inventory & Inspection Database
  • Performance Implications of Investment &

Preservation Strategies

– Given specified budget, estimate future health index

  • Generate Candidate Bridge Projects
  • Develop Project Scope of Work
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SLIDE 25

SDDOT History with BrM

  • Been active with AASHTO products of Pontis

and now Bridge Management since mid-1990’s

  • Some initial work in Pontis 2.0
  • Production with Pontis 3 in 1997
  • Developed element deterioration models
  • Been using Pontis as part of project planning and

programming

  • Have entire STIP and all past projects in the

application

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SLIDE 26

SDDOT Future BrM

  • Migration of CoRe Elements to 2013 AASHTO

Elements

  • Migration from Sybase to SQL Server database
  • Migration from Pontis 4.4.3 to Bridge

Management 5.2.1 SP2

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SLIDE 27

Questions?