Michael B. Johnson P.E. Nancy Bruton P.E. California Department of Transportation National Bridge Preservation Conference - Orlando April 2014 INCORPORATING BRIDGE PRESERVATION OBJECTIVES INTO ASSET MANAGEMENT PLANS

Map-21 requires transportation agencies to develop risk based asset management plans for all National Highway System (NHS) Bridges regardless of owner. The NHS was expanded to include local agency bridges Bridges on the NHS compete for funds with other assets. BACKGROUND

Caltrans has an established bridge preservation program for state owned bridges Qualified preservation actions institutional in nature Performance is measured by the time from recommendation to completion of the work. Preservation funding for local bridges available but it competes with rehabilitation and replacement needs. BACKGROUND

THE CHALLENGES How can we effectively incorporate bridge preservation into asset management for all bridge owners? How can we ensure that preservation projects are being done at the appropriate time? How can we identify the bridges that meet our desired preservation criteria?

THE CHALLENGES Expansion of the NHS to include local bridges necessitated Defining a formal preservation goal Associated preservation performance measure Funding eligibility criteria

THE CHALLENGES Wanted to encourage a three pronged approach to bridge management for all bridges that included: Preservation Vulnerability Mitigation Seismic and Scour initially Rehabilitation and Replacement Replacement driven by life cycle cost analysis

ESTABLISHING A PRESERVATION GOAL We wanted to encourage timely bridge preservation We wanted to limit preservation funding to projects that could delay future rehabilitation or replacement We needed a preservation program structure that fostered good bridge management behavior We needed a program that was objective and transparent to all bridge owners

THE BRIDGE PRESERVATION INDEX Caltrans developed the “Bridge Preservation Index (BPI)” to evaluate bridge preservation Looks for bridges that have poorer condition preservation elements Considers only bridges that are in good to fair overall condition

THE BRIDGE PRESERVATION INDEX Uses AASHTO 2013 Bridge Element Inspection Manual Considers the condition of the following elements and protection systems: Deck Condition Wearing Surfaces Steel Protective Coatings Joint Seal Condition

ELEMENT CONDITION INDICES The condition of any component of a bridge can be calculated by combining the condition of the related elements. Concept first published in TRNews in Quantity of element in each condition state is weighted as follows: State 1State 2State 3State

CONDITION INDEX CALCULATION EXAMPLE

THE BRIDGE PRESERVATION INDEX (BPI) BPI = W D *DCI + W P *PCI + W J *JCI DCI = Deck Condition Index PCI = Paint Condition Index JCI = Joint Condition Index W = Component weighting factors

THE BRIDGE PRESERVATION INDEX (BPI) WEIGHTS ComponentAll Components No CoatingNo Joints or Paint No Joints Bare Deck or Wearing Surface 40%80%100%50% Paint/Coating40%0% 50% Joints20% 0%

THE BRIDGE PRESERVATION INDEX

Overall Bridge Condition Bridge Preservation Index High LowHigh THE BRIDGE PRESERVATION INDEX RehabilitationPreservation High Priority Preservation Med Low

CONCLUSIONS Caltrans believes that good asset management should include a preservation element. The Bridge Preservation Index provides a way to incorporate preservation into asset management plans. The BPI can be used to identify good preservation candidates and monitor performance. The BPI can be used to establish preservation funding eligibility.