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500 Fifth Street, NW, Washington, DC 20001 Phone 202.334.2569 Fax 202.334.3510 E-mail firstname.lastname@example.org www.TRB.org February 23, 2016 Mr. Gregory G. Nadeau Administrator Federal Highway Administration U.S. Department of Transportation 1200 New Jersey Avenue, SE HOA-1, Room E87-314 Washington, DC 20590-9898 Re: 6th Letter Report of the TRB Long-Term Bridge Performance Committee Dear Mr. Nadeau: I am writing to report the findings and recommendations developed at the meeting of the Transportation Research Board (TRB) Long-Term Bridge Performance (LTBP) Committee on November 17-18, 2015. As explained in earlier letter reports, this Federal Highway Administration (FHWA) long-term program addresses the challenges faced by federal, state, and local transportation agencies in the operation and maintenance of their deteriorating highway bridges. The program will collect research-quality data on a large representative sample of in-service U.S. highway bridges and analyze these data to improve understanding of the mechanisms and timing of bridge deterioration due to age, materials, traffic, and weather. The data collection and analysis will also help evaluate the effectiveness of intervention options in ameliorating this deterioration. Through a contractual arrangement with FHWA, the National Research Council of the National Academies provides advice and assistance on the conduct of the LTBP program through the work of its TRB LTBP Committee. The agenda of the meeting consisted of informational briefings and status reports by members of the FHWA LTBP Research Team and the chair of the committeeâs Expert Task Group (ETG) on LTBP Special Activities, each followed by a question-and-answer period and discussion. Among the matters addressed were the following: the status of the program, updates on ongoing and newly initiated activities including the LTBP Business Plan, data collection, the Bridge Portal, data-driven research-oriented deterioration studies, cost analysis modeling, characterization of dynamic response to high loads, and program outreach. At the conclusion of these open sessions, the committee held a closed session to deliberate on its findings and formulate its consensus advice1. The detailed findings and recommendations appear after the following general summary: 1 The committee's advice is presented as a set of pairs of findings and recommendations. A committee finding is a conclusion based on the meeting's reading material, presentations, and discussions. A committee recommendation is a suggested action by the LTBP team as a consequence of this finding. Each finding-recommendation pair is given a unique designator (letter report number/recommendation number) to facilitate future referencing. The usual format of a finding-recommendation pair is a paragraph or paragraphs summarizing the committee's finding and a paragraph
2 â¢ Reports from committee members who attended a recent LTBP state coordinatorsâ meeting indicate that the value of LTBP is now generally apparent. â¢ The LTBP Bridge Portal is seen as a rich source of bridge data. â¢ Element-level data are being added to the portal by state departments of transportation (DOTs), and higher-level modeling is being developed on the basis of those data. â¢ Data-driven deterioration modeling is being developed for use in defining performance. â¢ With the inclusion of nondestructive evaluation (NDE) data from the pilot bridges and the potential for more data from reference bridges in the clusters, performance modeling for various types of bridges is within reach. â¢ Protocols are in place to allow owner agencies to start replicating LTBPâs data collection to determine the performance of bridge subsets and correlate them with LTBPâs findings. â¢ The NDE Web Manual provides guidance on improving the collection of data-driven bridge performance information. â¢ The coordination with the pooled-fund program on the effect of truck size and weight on bridges will help establish a data-driven approach to this issue. â¢ The data collection and monitoring now being undertaken can be the means for quantifying the value of effective preservation actions and encouraging their application and the use of more durable materials. â¢ Outreach efforts highlighting applications of the Robotics Assisted Bridge Inspection Tool (RABIT2) were effective in demonstrating LTBP accomplishments, and similar efforts with regard to the Bridge Portal would be appropriate. Future efforts should be planned, especially those concerning bridge preservation and management. However, the committee recommends development of an additional parallel approach targeting DOT upper management and CEOs. LR06/01 The committee noted significant progress in several areas: development and availability of LTBPâs Bridge Portal, collection of historical data and data monitoring the performance of cluster bridges, completion of many data collection and analysis protocols, and development of deterioration modeling tools. LTBPâs potential for improving the understanding of bridge performance and providing tools that will help translate that understanding into improved design, operations, and maintenance of highway bridges is evident. We recommend that the development of data-driven decision-making tools be adopted as the key goal of all LTBP outreach efforts, especially in communications to LTBPâs state coordinators, American Association of State Highway and Transportation Officials (AASHTO) containing the committee's recommendation. The latter paragraph is italicized and underlined. 2 The RABITâ¢ bridge deck assessment tool was developed by the LTBP program to deploy a suite of nondestructive evaluation technologies simultaneously, and thereby to enhance the field assessment of bridge decks.. The technologies incorporated into the remotely controlled RABITâ¢ include: â¢ Panoramic Camera to collect high-quality, 360-degree images around the bridge deck. â¢ High-Definition Imaging to capture high-resolution images of the deck surface using professional-grade cameras. â¢ Electrical Resistivity to characterize the corrosive environment of the concrete. â¢ Impact Echo and Ultrasonic Surface Waves to evaluate concrete delamination and concrete deck strength. â¢ Ground Penetrating Radar to âmapâ rebar and other metallic objects below the surface using electromagnetic waves, and to provide a qualitative assessment of concrete deck deterioration. â¢ Global Positioning System to record and mark location data, making testing grids virtually obsolete.
3 committees, and individual state DOTs. We request a briefing at the next meeting on the progress being made in improving access to the LTBP database. LR06/02 The committee was pleased with the progress in defining the overall strategy, direction, and expected outcomes of the program in the LTBP Business Plan. We look forward to receiving periodic updates on the plan. We suggest that the plan define and distinguish between LTBPâs short- and long-term goals, establish measurable outcomes, and include contingency plans for reduced funding scenarios. We also suggest that the plan for collection and analysis of performance data and for the development of data-driven decision-making tools based on such data and analysis be structured in a way that identifies and prioritizes the key components of highway bridges influencing their service life. Most important is a clear statement of how LTBP supports federal and state agency efforts to improve the management and preservation of highway bridges. LR06/03 With field monitoring data from LTBPâs pilot bridges and the potential for collection of additional data from reference bridges in LTBPâs clusters, the analysis of performance data for various types of bridges is clearly within reach. Considerable effort has been expended by LTBP in developing a data-driven bridge deterioration prediction procedure, but the committee is uncertain of the procedureâs value because it is highly theoretical and based on complex statistical analysis. LTBPâs approach is claimed to include auto adjustments (âlearningâ) similar to AASHTOâs ongoing BrM software development3 because numerical iterations with additional data are conducted, except that BrM uses visual element-level data and the LTBP model can incorporate direct NDE measurements. Some time will be required before the LTBP database is sufficiently well-populated with research-quality data to enable full demonstration of this procedure. We suggest that development of this procedure continue but that additional numerical cases be studied by using a variety of mechanistically based deterioration models and weighting values to demonstrate the fundamental assumption that this procedure can âlearnâ through numerical iterations and that its results are independent of the initial weightings used. We request a briefing at our next meeting that focuses on the need for this new deterioration model, its extension of the capabilities of BrM, and its expected applications within the LTBP program. 3 The AASHTOWare Bridge Management software (BrM), formerly Pontis, was first developed under a National Cooperative Highway Research Program (NCHRP) project sponsored by FHWA in the early 1990s and soon thereafter was transferred to AASHTO for further development, maintenance, and support. For more than 20 years BrM has seen dramatic improvements due to technological changes, product innovations, and, most important, direct user feedback. BrM is a key product in the AASHTOWare software suite and continues to be the primary bridge management software among transportation agencies across the United States and internationally.
5 ATTACHMENT 1 TRB Long-Term Bridge Performance Committee Membership Roster Bruce V. Johnson, Chair State Bridge Engineer Oregon Department of Transportation R. Scott Christie Deputy Secretary for Highway Administration Pennsylvania Department of Transportation Matthew M. Farrar State Bridge Engineer Idaho Transportation Department Karl H. Frank Chief Engineer Hirschfeld Industries, Austin, Texas Gregg C. Fredrick Assistant Chief Engineer Wyoming Department of Transportation Malcolm T. Kerley President NXL Construction Services, Inc., Richmond, Virginia John M. Kulicki Chairman Emeritus Modjeski and Masters, Inc., Mechanicsburg, Pennsylvania Richard D. Land Quality Practice Leader, Complex Bridges AECOM, Sacramento, California Sandra Q. Larson Director, Systems Operations Bureau Iowa Department of Transportation Paul V. Liles, Jr. Roswell, Georgia Samer Madanat Xenel Professor of Engineering University of California, Berkeley Ananth K. Prasad Senior Vice President and National Transportation Practice Leader HNTB Corporation, Tallahassee, Florida Kenneth D. Price Vice PresidentâNational Bridge Practice HNTB Corporation, Chicago, Illinois LIAISONS Patricia Bush Program Manager for Bridges and Structures American Association of State Highway and Transportation Officials, Washington, D.C. Waseem Dekelbab Senior Program Officer, TRB NCHRP, Washington, D.C. Danielle Kleinhans Concrete Reinforcing Steel Institute, Schaumburg, Illinois William F. McEleney Director National Steel Bridge Alliance, Cranston, Rhode Island Ted M. Scott III Director of Engineering American Trucking Associations, Alexandria, Virginia
ATTACMENT 2 Agenda TRB Long-Term Bridge Performance Program Advisory Committee (BCOM) November 17â18, 2015 Arnold and Mabel Beckman Center 100 Academy, Irvine, California This committee provides an ongoing peer review of the Long-Term Bridge Performance (LTBP) program, which is an extended research effort to measure and monitor the performance of a nationally representative sample of bridges. The committee reviews the LTBP programâs plans, operations, progress, and products and provides advice to FHWA on the programâs strategic plan; data definition, standardization, quality control, and collection efforts; sampling plan; and overall R&D program management and direction. Tuesday, November 17, 2015 Board Room 8:00â8:30 a.m. - Welcome, Introductions, Administrative Matters - Review of Staff Notes, Adoption of Agenda - BCOM Scope, Role, and Operations Bruce Johnson (BCOM Chair) Rob Raab (TRB Staff) I/A a 8:30â9:00 a.m. BCOM Letter Report No. 5 FHWA Response to BCOM Letter Report No. 5 Bruce Johnson, Rob Raab Rob Zobel (FHWA), Hamid Ghasemi (FHWA) I 9:00â9:15 a.m. Special Activities ETG Report Jugesh Kapur (BSPEC Chair) I 9:15â10:00 a.m. LTBP Program Update - Data Collection, Management, and Analysis - LTBP Draft Business Plan Rob Zobel I 10:00â10:15 a.m. Break 10:15â10:20 a.m. LTBP Share Point Site Rob Zobel I 10:20â11:15 a.m. LTBP Bridge Portal Demonstration Rob Zobel I 11:15 a.m.â noon BCOM Guidance - Business Plan, High-Priority Issues, Moving Forward - LTBP Bridge PortalâFuture Development - Data Collection Efforts Rob Zobel A Noonâ1:00 p.m. Lunch 1:00â1:45 p.m. LTBP Data-Driven Research-Oriented Deterioration and Cost Analysis Modeling Efforts Rob Zobel, Haotian Liu (Rutgers) I 1:45â2:15 p.m. Bridge Dynamic CharacterizationâTHMPER Frank Moon (Rutgers) I 2:15â3:15 p.m. BCOM Guidance - Bridge CharacterizationâTHMPER - Deterioration and Cost Analysis Modeling Rob Zobel A 3:15â3:30 p.m. Break 3:30â4:00 p.m. Outreach/Leveraging Dick Dunne (Michael Baker) I 4:00â4:30 p.m. Discussion/Recap Bruce Johnson I/A 4:30â5:30 p.m. Closed Session - Biases and Conflicts of Interest - Consensus Deliberations 5:30 p.m. Adjourn for the Day
Wednesday, November 18, 2015 Balboa Room 8:00â11:15 a.m. BCOM Guidance 1- Working Group Development 2- Business Plan 3- High-Priority Performance Issues 4- BEASTâLeveraging with LTBP 5- Weathering Steel White Paper 6- Glossary White Paper 7- Status Reportsâ3 Months Rob Zobel I/A 11:15-11:30 a.m. Chairmanâs Recap of Issues Bruce Johnson A 11:30 a.m.â noon Closed Session - Committee Disclosure of Biases and Conflicts of Interest Rob Raab A Noonâ1:00 p.m. Lunch 1:00â2:00 p.m. Closed Session - Committee Deliberation on Consensus Statement Rob Raab 2:00â2:30 p.m. Open Session -Concluding Remarks Bruce Johnson 2:30 p.m. Adjourn a The labels âIâ and âAâ signify that the respective agenda items are intended to provide information (I) to the committee or to request committee action (A) in the form of feedback. The absence of an âAâ is not intended to prevent committee feedback on any agenda item. This meeting was held to gather information that will form the basis of BCOMâs findings and recommendations. The findings and recommendations will be reported in writing to FHWA and AASHTO in the weeks after the close of the meeting.