Federal Highway AdministrationLong-Term Bridge Performance ProgramLTBP Program Updatefor Virginia Concrete Conference, Richmond, VAMarch 4, 2011Michael C. Brown, Ph.D., P.E. Research ScientistVirginia Center for Transportation Innovation and Research

Scientific Quality Bridge Performance DatabaseDetailed inspection, periodic evaluation and monitoring (representative sample of bridges)

Taking advantage of legacy data and existing research activitiesDesired/Anticipated Outcomes

Improved knowledge of bridge performance

Development of improved predictive and deterioration models

Means to quantify effectiveness of various maintenance, preservation, repair and rehabilitation strategies

Tools for bridge management

Standards for testing and monitoringLTBP Objective

Team Organization

Focus Groups - Participating State DOTs

Design of experimental programKnowledge GapsSamplingPilot Bridges

Pilot Bridges - Participating State DOTsPilot

US 15 over I-66Haymarket, VA

Virginia Bridge TestingUSWImpact EchoElectrical ResistivityGPRCoring

Deck Surface Damage SurveyVirginia Bridge

Corrosion Testing and Physical SamplingVirginia Bridge

Half-cell Potentials (mV)Interpretation of Corrosion DataVirginia Bridge

Indication of Active CorrosionRange(mV CSE)No. of dataPercentageLow Probability> -200310Indeterminate-200 to -3001447High Probability< -3001343Total30100

Delamination Assessment by Impact Echo

Concrete Degradation AssessmentUltrasonic Surface WavesGround Penetrating Radar (GPR)

Deck Surface Damage Survey versus Cover Depth (via GPR)Virginia Bridge

Deck Surface Damage Survey versus Impact EchoVirginia Bridge

Deck Surface Damage Survey versus Ground Penetrating RadarVirginia Bridge

Strain Transducers Deflectometers & LVDTsTilt metersThermocouplesLoad Test Instrumentation

Live Load TestingTruck type varies

Visual Inspection:light red - delaminationsdark red - patchesGPR Condition Map:yellow - poorred - seriousVirginia BridgeModelingDeterioration

Three FE Models created:Undamaged (Scenario E haunched)Realistic Damage: loss of 2 in. deck depth (E 4000 2)Extreme Damage: loss of 4 in. deck and reduced modulus (E 1000 4)14 ft from Damage LocationAt Damage LocationVirginia BridgeModeling Deterioration

Dynamic TestingVirginia Bridge

ConclusionsFE results & live load test results both show lower NA near damageInsignificant change in bottom flange strainMaximum of ~6 lowering of NA near damageStructural performance of bridge is not justification alone for deck replacement

I-195 Eastbound over Sharon Station Rd.near Allentown, NJNew Jersey Bridge

I-5 over Lambert Roadnear Sacramento, CaliforniaCalifornia Bridge

Cannery Road, US 15, North of Salt Lake City, Perry, UtahUtah Bridge

NY RTE 21 over Karr Valley Creeknear Almond, New YorkNew York Bridge

Trunk Highway 123 over Kettle Rivernear Sandstone, MNMinnesota Bridge

RT 430 WB over ICWDaytona, FLFlorida Bridge

LTBP Pilot Study StatusInitial testing on all pilot bridges to be done by 9/30/2011 = Complete = In progress= Future

ActivityVAUTCANJMNNYFLBridge SelectionFinite Element ModelLive Load TestingVisual InspectionNDE Deck SurveyCoring & Physical TestingAnalysis of Results

Content ManagementBridgePortalKey technologiesData MiningAdvanced VisualizationSolution for collaboratively creating, editing, searching and archiving bridge performance data.Build a longitudinal health record for each bridge.Cross-data querying: Search for bridges based on cross-data criteria.Clustering: Group bridges based on common properties.Deterioration analysis: Detect patterns in deterioration processes.Map and mash bridge assets on GIS systems from different providers.Multidimensional, interactive charting.

User access control*: Prevent unauthorized data access.Decentralized security model: Owners of data have full control of their data by deciding who can access the data.Data Security

Data Infrastructure

GIS visualization of searched bridgesSize of circles encodes ADTColor encodes deck condition of 2007Blue squares indicate WIM stations

Performance distribution of this clusterEach bar indicates the number of bridges with a certain deck conditionThe blue bar indicates the subgroup which contains Bridge I-15 Map shows the location of those 3 bridges that have deck condition 9

What is the expected condition in 5 years?The substructure condition is predicted to decrease to 7 whereas to deck condition is most likely to stay at 7 How fast did the deterioration progress compared to similar bridges?

Reference Bridge Data Collection Visual InspectionNon-standardArms lengthSegmentalConventional Tools

Matl TestingMaterial SamplingStiffnessStrengthPorosityChloride Content

Global TestingLoad Testing Modal TestingContinuous MonitoringNDEImpact EchoGPRUltrasonicSeismicResistivity

Reference Bridge and Supporting ClusterVisual InspectionNon-standardArms lengthSegmentalConventional Tools

Comparison: Reference vs. ClusterIdentify discrepancies establish root causesEstablish typical levels of variability

Multiple Clusters of Similar BridgesCluster of Bridge Type A

Comparison: Cluster vs. ClusterIdentify influences of climate, traffic, maintenance practices, etc.

Clusters of Different Bridge Types

Program TimelineMay2008Development phase commencesAugust2008Focus Groups 15 DOTs through December 2009August2009Pilot phase commences VA pilot bridgeMarch2010Workshop on Performance Issues related to geotechnologyDec2010Bridge Portal deploymentSpring2011TRB LTBP Advisory Board meeting (tentative)August2011Planned completion of the pilot phaseFall2011LTBP State Coordinators Group meeting (tentative)

Moving Forward Data collection of remaining Pilot BridgeData fusion and evaluation of information collected during Pilot ProgramContinue development and roll out of Bridge PortalInternational Guideline for Structural Health MonitoringBegin the Long Term Data Collection phase of program

LTBP Program Information LTBP Program Websitehttp://www.tfhrc.gov/ltbp

Hamid GhasemiProgram ManagerLTBP Program202-493-3042hamid.ghasemi@fhwa.dot.govJohn PenrodPilot Program ManagerLTBP Program202-493-3051john.penrod@fhwa.dot.gov

*********The portal is based on the following four key technologies:Security: A security model that meets the highest security standards (approved by NIST) and at the same time gives the owner of the data the full control over their data; Content management: The portal provides a longitudinal record of each bridge and allows (authorized) users to manage their dataData mining: The portal provides users with the functionality of searching for specific bridges based on cross-data filtering criteria (e.g. searching for all steel bridges located in humid weather areas requires to query two databases, NBI for bridge inventory information and the weather database for humidity statistics. The portal also calculates the cluster of similar bridges for a specific bridge and provides survival statistics.Advanced Visualization: The portal incorporates cutting-edge charting techniques for visualizing multidimensional data and comes with an integrated Geospatial information system (GIS) supporting maps from all major providers such as Google, Microsoft, Yahoo etc..**Show video or screenshots*********