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Vermont AOT
Bridge Maintenance and Preservation Conference
July 1, 2008
George A. Christian, P.E.
Inspection Data for Bridge Asset Management
New York StateDepartment of Transportation
New York State DOT approach and Practice
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OutlineBridge Management BackgroundNYS Bridge Evaluations
BackgroundBridge inspection ProgramInspection DataBridge Evaluation Programs
Bridge Asset Management StrategiesBridge Management analysis methods
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Asset Management
“Transportation Asset Management is a strategic and systematic process of operating, maintaining, upgrading and expanding physical assets effectively throughout their lifecycle. It
focuses on business and engineering practices for resource allocation and utilization, with the
objective of better decision-making based upon quality information and well-defined objectives.”
- AASHTO Subcommittee on Asset Management
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Bridge Management BackgroundTo manage bridges effectively we need the
following primary components:
Inventory definitionCurrent condition assessmentKnowledge of bridge vulnerabilities.Tracking of needs and projectsEconomic evaluation of potential actionsForecasting of deterioration and needsPhoto and document archive
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NYS Bridge Management System
Inventory Data Bridge Inspection Condition AssessmentVulnerabilitiesBridge Network Modeling Resource Allocation
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NY State Bridges
Owners: NYSDOT, Local Gov’ts, Authorities17,400 bridges carry public highways, 50,000+ spans
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NYS Bridge Ownership
(Local) 8587
(Other) 1187
(State)7632
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NYSDOT Bridge Evaluations
Program, in current format, developed in early 1980’s
Bridge Inspection (general and diving)Detailed Bridge Inventory -- BDMSLoad Capacity Evaluation (Rating, Posting)Bridge Safety Assurance (Vulnerabilities) Program
Bridge Inspection program is the primary data source for all evaluation functions
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NY’s bridge inspection programKey FeaturesClear mandateCentralized Responsibility and oversightFunding / Resource PriorityQuality ProvisionsCritical Findings ProcedureSafety CentricElement LevelData source for Bridge Mgmt.
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NYS Bridge Inspection Program
NYSDOT inspects State and Local owned highway bridges in New York StateInspection Team Leader must be a licensed Professional Engineer (P.E.)Biennial Inspection ProgramInterim Inspections9,500 NYSDOT inspections / year
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Element Level Inspections
Examine and evaluate all elements of the bridge (Visual, Tactile, Sounding)
Rate 47 elements22 common to all bridges25 on span by span basis
Document and photograph all “deficient” elements Measure and sketch deterioration and scour as necessary
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NYS Bridge Inspection Rating Scale
7 -- New condition, no deterioration6 --5 -- Minor deterioration and
functioning as designed 4 --3 --Serious deterioration or
not functioning as designed2 --1 -- Totally deteriorated or failed
condition
Def
icie
ntN
on-D
efic
ient
Good
Fair
Poor
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NYS Inspection Standards
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NYS Condition Rating
It is a rating calculated based on weighted inspection ratings of several components
Uses 13 different element ratingsWhen multiple rated elements exist, such as abutment backwalls, the calculation utilizes lowest rated elementIf C.R. < 5.00, the bridge is considered “Deficient”according to NYSDOT
C.R. is NYSDOT’s most widely used bridge condition performance indicator
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Uses of Inspection Data
Providing Data for Program PlanningUsed for developing capital program by using data with BMS softwareUsed to compute “Sufficiency Rating” (measure of the bridge’s ability to remain in service) to determine federal funding eligibility
Evaluation FunctionsInspection report used as a basis for structural integrity evaluations, load rating, and other functionsInspection report documentation as a reference
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Uses of Inspection Data
Scheduling Maintenance ActivitiesEmergency RepairsFlag RepairsCorrective MaintenancePreventative Maintenance
Satisfying Federal and State Reporting Requirements
Annual “Federal Tape”Annual NYS “Report of Bridge Management and Inspection Programs”
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Uses of Inspection Data
ForecastingElement deteriorationCondition rating trendsWork strategy forecasts
Cost estimatingCombine condition and inventory data
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Load Rating /Posting /Permit Reviews
State and Federal RequirementsNYSDOT Load Rating system
Bridge structural element databaseUse AASHTOWare® VIRTIS
Update data thru inspection program
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Bridge Safety Assurance Program (BSA)“Vulnerability Assessments”
Program of assessment of bridges’ vulnerability to structural failure due to their inherent characteristics or due to extreme eventsAssessments are made for individual failure modes
“Identify causes of failure beyond condition”(Why do Bridges Fail?)
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NYSDOT Bridge Failure Database
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NYSDOT Bridge Safety Assurance Program
Systematic evaluations of bridges based on failure modes.
Hydraulics Steel Details Overload Concrete Details Collision Earthquake
Evaluate statewide bridge population:Screen Assess Classify
Vuln. Classifications consider failure likelihood and consequence.Evaluation data needs collected during bridge inspections
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NYSDOT Bridge Safety Assurance
Vulnerability Assessment ProceduresAssessment ManualsRefined flowchart methods for screeningFollow up analysis for higher vulnerabilities Bridge Inventory database for screening and assessment updates
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NYSDOT Bridge Safety Assurance Program
Vulnerability Ratings (for each Failure Mode)
1. Safety Priority Action2. Safety Program Action3. Capital Program Action4. Inspection Program Action5. No Action
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BSA Safety Priority Action
Scour VulnerabilityMitigation
Scour RetrofitsFlood Warning Action PlanPost Flood Inspections
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BSA Capital Program Action
Retrofits: add primary redundancy
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NYSDOT Bridge Management Strategy
Goal OrientedDecentralized-but with central oversight Combined Capital and Maintenance programsLeast cost analysis for MR&R alternativesMaintenance /Operations First
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NYSDOT Bridge Goals
Eliminate Critical conditions:Low critical element ratingsHigh BSA vulnerabilities
Preservation:Reduce the overall number of deficient bridgesMaintain Interstate bridges in good conditionMaintain NHS bridges in at least fair condition
ServiceabilityReduce load restrictionsEliminate highway bridge clearance restrictions
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Performance Measures
Percentage of deficient bridgesStatewideInterstatesNHS
Number of bridges with critical elements rated less than 3 (serious deterioration)Serviceability by Hwy. classification
Number of bridges with load restrictionsNumber of bridges with clearance restrictions
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Maintenance / Operations FirstNYSDOT Bridge Maintenance
Corrective MaintenancePreventive (Cyclical) Maintenance$100 Million program
(out of $600 M state bridge program)In-house and contracted
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Bridge Maintenance
Corrective Maintenance
“Element Level” workElement inspection condition info.
ID work candidatesPerformance measure
Federal-aid (HBP) eligibleDelivery Initiatives
Job-order contracts
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Bridge Maintenance
Preventive (Cyclical) Maintenance
Washing (2 yr. cycle)Lubricate Bearings (4 yr.)Deck Sealing (4 yr.)Painting (12 yr.)Deck Overlay (12 yr.)Replace Deck Joints (as needed)
Federal-aid (HBP) eligible
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r
NYSDOT Bridge Preservation Status
4.4 $250K
$5K
4740 Fair Bridges
790 Poor
Treatment Costs / Bridge
Maintenance Candidates
Major Rehab or Replacement Candidates
2370 Good Bridges
5.8
$3.7M
Curve w/ Corrective Maintenance
Curve w/out Corrective Maintenance
Justification for Corrective Maintenance Program
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Local Projects
Included in Regional program updatesFed. Aid “pass-thru” projects (local let)DOT Oversight and Assistance
Local Projects Manual documents project development processStatewide Conference on Local Bridges
Information exchangeTraining
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Bridge Management Analysis Tools
Deterioration modelingNeeds assessment modelsCost assessmentForecasting BMS Software
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Deterioration ModelingElement Deterioration Curves
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Cost Modeling
Bridge unit cost dataReplacement cost estimating model
Based on historical dataBase area costsFeatures costs
Continuously updatedMaintenance and Rehab costs:
Inspection condition data determines work strategies—element combinationsAverage work strategy costs / s.f.
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Bridge Network AnalysisBridge Program Worksheet
Identifies program candidates for goal attainment using:
Condition (BDMS)InventoryElement and bridge inspection condition values
BSA vulnerabilities (BSA dB)Program Status (PSS)Deterioration module
Evaluates program updatesForecasts
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Bridge Network AnalysisBridge Needs Assessment Model (BNAM)
Forecasting-- Identifies present and future improvement needs for highway bridgesRegional bridge program development and evaluationStatewide bridge needs analysis and resource allocationUses Condition Rating as performance measureScenario analysis—treatment strategies, funding levels….
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Bridge Network AnalysisProgram Evaluation and Forecasts
State Highway Bridge Trend and Forecasts
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1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016
Year
Perc
ent D
efic
ient
by
Num
ber
History Current Funding Needs Study Proposed Program
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Next StepsImprove on element level data for BMS purposes
condition state extentsImprove cost estimating modules
OptimizationQuantify life cycle costs
Preservation costsUser costs
Quantify benefits
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AASHTOWare® PONTISBMS Software
Licensed by most State DOT’s for over 15 years.Comprehensive BMS features
OptimizationPontis 5.2 (2009)
Software will feature a project focus with vastly improved project analysis capabilities.Multiple objective modeling framework.Incorporation of bridge risks.
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Pontis implementation IssuesElement level data
Uses AASHTO Core Element (CoRE) dataCollect CoRE data?Translate NYS to CoRE?Define new elements?
Program Optimization assumptionsOptimal means the least long term benefit / cost for each element stateMR&R benefits can be measured in two ways: future cost avoidance or change in element value (Bridge Health Index).
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Least Cost Optimization Results
Health Health IndexIndex
TimeTimeNear Term Long Term
Low
High
Unconstrained Curve
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Optimal Preservation
LongLongTerm Term CostCost
ConditionConditionPoor GoodLowow
High
Cost Minimization Point
Typical DOT Practices
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Summary:Bridge Inspection data →Asset management
Bridge inspection DataElement level conditionsNon-condition data (serviceability, vulnerabilities)Accessible Quality
Data supports program goals/ measuresMaintenance, Rehab, Replacement programsBridge safety
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Questions?
NYSDOT Office of Structures
(518) 457-6827
www.nysdot.gov