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>> Presentation Overview
• Program History• Data Collection• Reporting• Sufficiency Rating
5/26/2016 Bridge Inspection Reports 101 2
>> Program History
• Silver Bridge Collapse in W.Va., 1967
FHWA Photo Archive
5/26/2016 Bridge Inspection Reports 101 3
>> Program History
• Surface Transportation Assistance Act, 1978
5/26/2016 Bridge Inspection Reports 101 4
>> Program History
• Mianus River Bridge Collapse in Conn., 1983
FHWA Photo Archive
5/26/2016 Bridge Inspection Reports 101 5
>> Program History
• Schoharie Creek Bridge Collapse NY, 1987
FHWA Photo Archive
5/26/2016 Bridge Inspection Reports 101 6
>> Program History
• I-35W Bridge Collapse in Minn., 2007
FHWA Photo ArchiveOBEC Load Rating of Wind River Bridge
5/26/2016 Bridge Inspection Reports 101 7
>> Presentation Overview
• Program History• Data Collection• Reporting• Sufficiency Rating
5/26/2016 Bridge Inspection Reports 101 9
>> Data Collection• SI&A Sheet
– 125 Items, including:– Condition– Location– ADT– Geometry– Detour– Structure Type– Replacement Cost
5/26/2016 Bridge Inspection Reports 101 11
>> Data Collection
• Structure Inventory and Appraisal per the FHWA Coding Guide– Functionally Obsolete,
• Appraisal Ratings: comparing the bridge to current standards (rail, geometry, alignment, design load etc.)
– Structurally Deficient• Ability to carry loads, deterioration
5/26/2016 Bridge Inspection Reports 101 12
>> Presentation Overview
• Program History• Data Collection• Reporting• Sufficiency Rating
5/26/2016 Bridge Inspection Reports 101 14
>> Reporting
• Fracture Critical Definition
– Steel– Tension members– Non-redundant
• Only two load paths• Simple spans• No internal redundancy, i.e. built-up members
5/26/2016 Bridge Inspection Reports 101 24
>> Reporting
• Timber Bore Logs
5/26/2016 Bridge Inspection Reports 101 29
14 inches
12 inches1” 1”
Description: X1R12X1
Drill Direction
Center Decay (R)
Good Wood(X)
SD = Starting to Decay
>> Presentation Overview
• Program History• Data Collection• Reporting• Sufficiency Rating
5/26/2016 Bridge Inspection Reports 101 33
>> Sufficiency Rating
• Definition: Calculated value used to indicate sufficiency of a bridge to remain in service.
• Broken down into 4 sections:– Structural Adequacy & Safety (55%)– Serviceability and Functional Obsolescence
(30%)– Essentiality for Public Use (15%)– Special Reductions (13%)
5/26/2016 Bridge Inspection Reports 101 34
>> Sufficiency Rating
• How this affects Funding?– Technical Ranking System for HBP
• Priority Points = (SRF + TBF + LDF + UBF) x 0.5 x BNM x FCM
• SRF makes up 50 out of 105 possible points
• Less than 80% = Eligible for Rehabilitation• Less than 50% = Eligible for Replacement
5/26/2016 Bridge Inspection Reports 101 35
>> Sufficiency Rating
• Values that go into SR– Structural Adequacy
& Safety – Serviceability
& Functional Obsolescence– Essentiality for Public Use – Special Reductions
5/26/2016 Bridge Inspection Reports 101 36
>> Sufficiency Rating
• Structural Adequacy & Safety (55%)• Superstructure (59)
– Deductions start at NBI = 5 or less
• Substructure (60)– Deductions start at NBI = 5 or less
• Culvert (62) - If Applicable– Deductions start at NBI = 5 or less
• Inventory Rating (66)– Deductions of loads less
than 32.4 tons
5/26/2016 Bridge Inspection Reports 101 37
>> Sufficiency Rating
• # of lanes on and under (28)• Average Daily Traffic (29)• Approach Roadway Width (32) • Bridge Roadway width (51)• Vertical Clearance Over (53)• Deck Condition (58)
• Structure Condition (67)• Deck Geometry (68)• Vertical Under Clearance (69)• Waterway (71)• Approach Roadway (72)• Defense Highway (100)
• Serviceability and Functional Obsolescence (30%)
5/26/2016 Bridge Inspection Reports 101 38
>> Sufficiency Rating
• Essentiality for Public Use (15%)• Bypass Detour (19)• Average Daily Traffic (29)• Main Structure Type (43)• Defense Highway (100)
5/26/2016 Bridge Inspection Reports 101 39
>> Sufficiency Rating
• Special Reductions (13%)• Bypass Detour (19)• Bridge Rail (36)• Main Structure Type (43)
5/26/2016 Bridge Inspection Reports 101 40
>> Summary
• Things to look for:– Sufficiency Rating less than 50%– NBI Ratings of Poor “4” or less– Element Condition Ratings in states 3 or 4– Load Rating Information
• NBI Item 41, anything other than “A” for open– Maintenance Recommendations– Supplemental Reports
• Timber Bore Logs• Fracture Critical Reports
5/26/2016 Bridge Inspection Reports 101 42
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