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Long-Term Bridge Performance

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    Nondestructive Evaluation (NDE)

    Each NDE technology has a specific physical principle and can detect certain type(s) of defect(s). To improve the quality and reliability of NDE data information, collect data with two or more NDE tools and technologies. These five NDE technologies were identified by the LTBP Program as appropriate to assess condition of concrete decks: half-cell potential (HCP); electrical resistivity (ER); impact echo (IE); ultrasonic surface waves (USW); and ground penetrating radar (GPR).
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    LTBP Bridge Portal

    The LTBP Bridge Portal is a centralized, national repository for efficiently and quickly accessing and querying bridge performance-related data, information, and data analysis tools. Version 1 of the Bridge Portal was deployed in October 2015 and includes a basic deterioration model; advanced data and statistical analysis; bridge performance assessment; geographic Information Systems (GIS) mapping and visualization; and custom reporting and data extraction.
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    LTBP Program Protocols

    The LTBP Program Protocols provide a set of step-by-step instructions governing all aspects of data collection, including visual inspection, material testing, NDE testing, live load testing, instrumentation, logistics, safety, data reduction and processing, data interpretation, reporting results, data storage, archiving, and importing into the LTBP Bridge Portal.
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    State LTBP Coordinators

    The LTBP Program State Coordinator is a bridge engineer selected by their transportation department to be their representative and support the LTBP Program. In total, the LTBP Program has 52 State Coordinators, one for each State transportation department, including the Commonwealth of Puerto Rico and the District of Columbia

Status of LTBP Program

The LTBP Program is a long-term research effort, authorized by the U.S. Congress under the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) to collect high-quality bridge data from a representative sample of highway bridges nationwide that will help the bridge community to better understand bridge performance. This site contains information about the program including a discussion of the program objectives and bridge selection methodology (About), LTBP ProductsLTBP CommunityNondestructive Evaluation and Structural Health Monitoring as it relates to the Program, and an update on Pooled Fund Project TPF-5(283): The Influence of Vehicular Live Loads on Bridge Performance, and a listing of current LTBP Program Publications.

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