BRIDGE INSPECTION REPORTS 101Protecting Your Bridge Inventoryfor the Future

Jason Kelly, PE

>> Presentation Overview

• Program History• Data Collection• Reporting• Sufficiency Rating

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>> Program History

• Silver Bridge Collapse in W.Va., 1967

FHWA Photo Archive

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>> Program History

• Surface Transportation Assistance Act, 1978

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>> Program History

• Mianus River Bridge Collapse in Conn., 1983

FHWA Photo Archive

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>> Program History

• Schoharie Creek Bridge Collapse NY, 1987

FHWA Photo Archive

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>> Program History

• I-35W Bridge Collapse in Minn., 2007

FHWA Photo ArchiveOBEC Load Rating of Wind River Bridge

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>> Program History

• Reference Materials

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>> Presentation Overview

• Program History• Data Collection• Reporting• Sufficiency Rating

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>> Data Collection

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>> Data Collection• SI&A Sheet

– 125 Items, including:– Condition– Location– ADT– Geometry– Detour– Structure Type– Replacement Cost

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>> 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

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>> Data Collection• Element Level Condition Data

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>> Presentation Overview

• Program History• Data Collection• Reporting• Sufficiency Rating

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>> Reporting

• Pontis Report

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>> Reporting

• Supplemental Reports

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>> Reporting

• Pontis Report- Front page

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>> Reporting

• Pontis Report - Notes

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>> Reporting

• Pontis Report -Maintenance

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>> Reporting

• Pontis Report - Load Rating Data

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>> Reporting

• Pontis Report - Schedule & Links

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>> Reporting

• Supplemental Reports - Underwater

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>> Reporting

• Supplemental Reports - Fracture Critical

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>> Reporting

• Fracture Critical Definition

– Steel– Tension members– Non-redundant

• Only two load paths• Simple spans• No internal redundancy, i.e. built-up members

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>> Reporting

• Supplemental Reports - Fatigue Prone

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>> Reporting• Fatigue Prone Details

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E’

C’

D

C

>> Reporting

• Supplemental Reports – Gusset Plate

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>> Reporting

• Supplemental Reports – Bore Logs

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>> Reporting

• Timber Bore Logs

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14 inches

12 inches1” 1”

Description: X1R12X1

Drill Direction

Center Decay (R)

Good Wood(X)

SD = Starting to Decay

>> Reporting

• Supplemental Reports – X-channel Profile

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>> Reporting

• Supplemental Reports – X-channel Profile

>> Reporting

• Supplemental Reports - Photos

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>> Presentation Overview

• Program History• Data Collection• Reporting• Sufficiency Rating

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>> 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%)

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>> 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

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>> Sufficiency Rating

• Values that go into SR– Structural Adequacy

& Safety – Serviceability

& Functional Obsolescence– Essentiality for Public Use – Special Reductions

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>> 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

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>> 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%)

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>> Sufficiency Rating

• Essentiality for Public Use (15%)• Bypass Detour (19)• Average Daily Traffic (29)• Main Structure Type (43)• Defense Highway (100)

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>> Sufficiency Rating

• Special Reductions (13%)• Bypass Detour (19)• Bridge Rail (36)• Main Structure Type (43)

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>> Sufficiency Rating

• Shareware

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>> 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

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>> Summary

• Questions?

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BRIDGE INSPECTION REPORTS 101

Jason Kelly, PEjkelly@obec.com971.634.2002

Protecting Your Bridge Inventoryfor the Future

www.OBEC50.com