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Network Life Cycle Analysis for Bridge Management
Rebecca Curtis, P.E.Michigan Department of TransportationBridge 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/AASHTOWareTM Bridge Management Software Prioritize between bridge projects Manage bridge elements Provides information for bridge engineers and practitioners
NBI Condition Ratings
NBI Condition Ratings
BCFS
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
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
60%
65%
70%
75%
80%
85%
90%
95%
100%
Bridge Condition Forecast - Statewide
Freeway Measured Non-Freeway Measured Freeway ProjectedNon Freeway Projected
Year
Pe
rce
nt
Bri
dg
es
Go
od
/Fa
ir
Co
nd
itio
n
Goal - 95% of Freeway Bridges in Good/Fair Condi-tion
Goal - 85% of Non-Freeway Bridges in Good/Fair Condition
Value of Network Modelling
What is the value of Bridge Preservation? What is the ideal mix of fixes?
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
70%
75%
80%
85%
90%
95%
100%
Bridge Condition Forecast System - Asset Management vs Worst FirstAll Roadway Bridges (MDOT and Local Agency)
Measured Worst First
YearPer
cen
t B
rid
ges
in
Go
od
or
Fai
r C
on
dit
ion
Value of Network Modelling
What is the impact of revised budgets? What is the funding need to meet goals?
Bridge Condition Forecast SystemMDOT All Highway Bridges
70.00%
75.00%
80.00%
85.00%
90.00%
95.00%
100.00%
1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Year
Per
cen
t B
rid
ges
in
Fai
r o
r G
oo
d C
on
dit
ion
measured Current Program Plus 60 Million Reduced Program
Mi-Dashboard Condition Goal = 93.6% Good or Fair
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
Factor Relative Weight
Scour (Item 113) 8.0
# of Sub Units 3.0
Footing Type 2.5
Skew Angle 5.0
Channel Protection 5.0
Soil Type 2.5
Scour Mitigation 2.0
Presence of Scour 6.0
Total Weight 34.0
Scour Criticality Factors
Factor Relative Weight
Highway Classification 1.0
Traffic Volume 2.0
Detour Length 3.0
Cost of Replacement 3.0
Economic Impact 5.0
Total Weight 14.0
Questions?
Rebecca Curtis, P.E.Michigan Department of TransportationBridge Management Engineer
2015 Transportation Asset Management Expert Task Group Webinar Series
