LTBP Program Update

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Federal Highway Administration Long-Term Bridge Performance ProgramLTBP Program Update for Virginia Concrete Conference, Richmond, VA March 4, 2011Michael C. Brown, Ph.D., P.E. Research Scientist Virginia Center for Transportation Innovation and Research

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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

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Team Organization

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Focus Groups - Participating State DOTs

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Design of experimental programKnowledge GapsSamplingPilot Bridges

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Pilot Bridges - Participating State DOTsPilot

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US 15 over I-66 Haymarket, VA

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Virginia Bridge TestingUSWImpact EchoElectrical ResistivityGPRCoring

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Deck Surface Damage SurveyVirginia Bridge

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Corrosion Testing and Physical SamplingVirginia Bridge

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

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Delamination Assessment by Impact Echo

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Concrete Degradation AssessmentUltrasonic Surface WavesGround Penetrating Radar (GPR)

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

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Deck Surface Damage Survey versus Impact EchoVirginia Bridge

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Deck Surface Damage Survey versus Ground Penetrating RadarVirginia Bridge

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Strain Transducers Deflectometers & LVDTs Tilt meters ThermocouplesLoad Test Instrumentation

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Live Load TestingTruck type varies

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Visual Inspection: light red - delaminations dark red - patchesGPR Condition Map: yellow - poor red - seriousVirginia BridgeModeling Deterioration

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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

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Dynamic TestingVirginia Bridge

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ConclusionsFE results & live load test results both show lower NA near damage Insignificant change in bottom flange strain Maximum of ~6” lowering of NA near damage Structural performance of bridge is not justification alone for deck replacement

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

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I-5 over Lambert Road near Sacramento, CaliforniaCalifornia Bridge

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

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

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Last Updated: 8th March 2018

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