Network Life Cycle Analysis for Bridge Management Rebecca Curtis, P.E. Michigan Department of Transportation Bridge Management Engineer 2015 Transportation.

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Presentation transcript:

Network Life Cycle Analysis for Bridge Management Rebecca Curtis, P.E. Michigan Department of Transportation Bridge Management Engineer 2015 Transportation Asset Management Expert Task Group Webinar Series

Where did we start?

Performance Measures

Where are we now?

Inventory Michigan has 10,991 bridges  State 4,450 bridges 94.2% good or fair  Local Agency 6,541 bridges 85.3% good or fair

Network vs. Project Level Analysis Network Level  NBI Minimum Condition Ratings  BCFS for forecasting (spreadsheet)  Manage populations of bridges  Provides information for executives, Legislature and State Transportation Commission Project Level  National Bridge Elements  Pontis/AASHTOWare TM Bridge Management Software  Prioritize between bridge projects  Manage bridge elements  Provides information for bridge engineers and practitioners

NBI Condition Ratings

BCFS

Inputs:  NBI conditions  Budgets  Strategies – “Mix of Fixes” % of budget dedicated to each main work category  Project costs (by main work category)  Preservation path Anticipated benefits of each main work category  Can incorporate programmed projects

BCFS Results Transition Probabilities

BCFS Results Track Deterioration Rates

BCFS Results Forecasted Bridge Conditions

Value of Network Modelling What is the value of Bridge Preservation? What is the ideal mix of fixes?

Value of Network Modelling What is the impact of revised budgets? What is the funding need to meet goals?

Value of Network Modelling What is the value of innovative materials?

Value of Network Modelling Develop preservation guidelines

Future Network Modeling at MDOT Scour Vulnerability Factors FactorRelative Weight Scour (Item 113)8.0 # of Sub Units3.0 Footing Type2.5 Skew Angle5.0 Channel Protection5.0 Soil Type2.5 Scour Mitigation2.0 Presence of Scour6.0 Total Weight34.0 Scour Criticality Factors FactorRelative Weight Highway Classification1.0 Traffic Volume2.0 Detour Length3.0 Cost of Replacement3.0 Economic Impact5.0 Total Weight14.0

Questions? Rebecca Curtis, P.E. Michigan Department of Transportation Bridge Management Engineer 2015 Transportation Asset Management Expert Task Group Webinar Series