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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This techbrief is an archived publication and may contain dated technical, contact, and link information|
|Publication Number: FHWA-HRT-14-031 Date: February 2014|
Publication Number: FHWA-HRT-14-031
Date: February 2014
PDF files can be viewed with the Acrobat® Reader®
As of April 2014, this online document was modified in the following way:
Editorial corrections were made to this report after the report was originally published. The following table shows the modifications that were made to this report.
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FHWA Publication No.: FHWA-HRT-14-031
This TechBrief summarizes Long-Term Bridge Performance Industry Day, held July 16, 2012, a public meeting sponsored by the Federal Highway Administration’s (FHWA) LTBP Program.
The FHWA Office of Infrastructure Research and Development initiated the LTBP Program in 2008. The LTBP Program is at least a 20-year research effort to collect scientific, performance, and field data from a representative sample of bridges nationwide. This research will help the bridge community better understand bridge deterioration and performance. This program will produce a collection of data-driven tools, including predictive models to optimize management of bridges. Input from state highway agencies and other stakeholders identified a variety of bridge performance issues to be evaluated.
A pilot phase has been completed to validate data collection protocols and a long-term data collection phase on bridges throughout the United States. The LTBP Program will use proven technologies to efficiently obtain the high-quality data needed.
The LTBP Program seeks opportunities to engage and collaborate with industry to learn of existing and innovative tools and technologies, services, or expertise. In November 2011, FHWA issued a Request for Information (RFI) to gain input from non-governmental organizations (e.g., private companies, professional organizations, academia, etc.) who share an interest in improving the health and operational capacity of the Nation’s bridges. Responders to the RFI submitted white papers outlining their suggestions for collaboration opportunities.
Subsequently, an Industry Day public meeting was held on July 16, 2012, in Alexandria, VA, to provide an open forum for FHWA and interested representatives from industry to discuss and share ideas. Nearly 60 people attended the event, including attendees from professional organizations, engineering consulting companies, and technology developers and vendors, as well as FHWA and State transportation departments.
The following sections highlight the collaboration opportunities discussed.
A poster session was held where FHWA invited all industry responding to the RFI to display information about their products and services in a poster and/or a one-page handout and to discuss how they may be applicable to the LTBP Program. The posters represented a cross-section of the Industry Day attendees.
Firms exhibiting a poster and/or providing attendees with handouts included the following:
Five professional organizations gave an overview of their expertise and proposed areas for collaboration to assist the LTBP Program.
NCBC represents a range of industry associations (including CRSI), providing shared expertise in materials, design, construction, and technology. CRSI proposed to use this expertise to support the LTBP Program by offering detailed program review, document review, or other technical input by its staff as requested. CRSI also noted that four ongoing CRSI corrosion research studies may provide potential areas of overlap with LTBP study topics where knowledge and data sharing may be mutually beneficial.
NCBC described how bridge construction, design, and materials have changed over time, and indicated these changes may affect bridge performance. Specifically, NCBC noted cements, reinforcement, and concrete additives have undergone much change since 1990. Additionally, NCBC described how the load and resistance factor design bridge design specifications, empirical deck design, jointless bridges, and increased span lengths have also changed and could affect bridge performance. NCBC also noted that accelerated bridge construction is a new process in bridge construction and may affect bridge performance.
NCBC also discussed different types of bridge deterioration. These included non-corrosion-related cracking and abrasion due to loads and weather and corrosion-related cracking due to deicing salts.
NCBC/CSRI also identified four short-term and six long-term study topics that it suggested could be considered within the LTBP Program. These included the following:
Short-term study topics included the following:
Long-term study topics included the following:
NSBA described their expertise that could support the LTBP Program’s research. Specifically, NSBA first described the successful collaboration between FHWA and the steel industry in the development and implementation of high-performance steel. NSBA then recommended five topics/technologies that could be incorporated into the LTBP Program and where NSBA could collaborate as follows:
ASCE’s presentation described the state of the Nation’s infrastructure and their estimates of the costs to businesses, users, and the Nation if nothing is done to improve the infrastructure. ASCE has eight institutes dedicated to the diverse technical specialties within the civil engineering profession. The Structural Engineering Institute (SEI) is directly related to the needs of the LTBP Program, and their mission statements are complementary. ASCE/SEI identified the following ways it could use its resources to support the LTBP Program:
The ACAT group represents a host of private companies that provide various technologies and services for bridge monitoring and evaluation. Based on this expertise, the ACAT group made several recommendations for collaborating with the LTBP Program. These ideas included:
ASNT is a professional organization for users and practitioners of NDE. ASNT described their specific expertise and their ideas for how their expertise can support the LTBP Program’s data collection needs. ASNT suggested several areas of collaboration as follows:
Following Industry Day, the FHWA attendees and a State transportation department stakeholder met and discussed material presented. The consensus was that the items presented by the industry groups offered much potential for help to the LTBP Program, specifically NSBA, NCBC, the ACAT group, and ASNT.
The questions and issues raised by the industry groups largely confirmed the scope of the 20 performance issues the LTBP Program identified through meetings with State transportation departments and its own research. The input from the industry groups provided valuable insight.
As an immediate follow-up to Industry Day, FHWA requested that NCBC prioritize the questions presented at Industry Day. NCBC provided the following ranking of the short-term questions separately and then the long-term questions separately:
Short-term questions include the following:
Long-term questions include the following:
Short-term questions include the following:
1. Are better construction techniques being employed to ensure better
concrete placement and curing? (Tie
1. What are the effects of abutments? MSE walls? Integral abutments? (Tie for first.)
3. What do different States provide in terms of typical annual maintenance of a bridge? Is it documented? (Tie for third.)
3. What are the various States’ policies/practices on deicing salt application? (Tie for third.)
Long-term questions include the following:
1. What is the role of deck cracking in performance?
2. What is the role of concrete permeability? (Tie for second.)
2. Do the AASHTO designs affect performance, such as requirements for shrinkage and temperature steel? (Tie for second.)
4. Are dynamic response characteristics of structures being captured with the other data? Is there a measurable change in stiffness over time? (Tie for fourth.)
4. What are typical repair schedules, and how do these affect cost and performance? (Tie for fourth.)
6. Are the planning models appropriate for bridge design? Is functional obsolescence more likely than structural deficiency for a 100-year service life?
AMENDED April 24, 2014
Since Industry Day, FHWA has met with and discussed possible collaboration with NSBA, NCBC, and the ACAT group. Plans for meeting with ASNT are underway. Collaborative projects with NSBA and NCBC have begun. Efforts are underway with these industry groups and the FHWA LTBP staff to begin creating national timelines of milestone changes in bridge practices from 1960 to the present. The ACAT group has provided detailed reviews of draft LTBP protocols for long-term instrumentation of bridges.
Industry Day provided a platform for the LTBP Program to actively engage industry groups and foster collaboration. Attendees exchanged many ideas and identified opportunities to work with and support the LTBP Program. Many different technologies were displayed during the poster session, and the industry/professional associations in attendance presented different ways that they could lend their expertise.
There are many potential mutual benefits to collaboration, including sharing expertise; data-sharing to utilize existing data, studies, and data collection or monitoring systems; cost-sharing on specific studies or technology implementation; developing data collection standards, personnel certification, and training materials; and deploying innovative, field-ready technology, which supports LTBP data collection needs and can provide a path to validation for new technology.
The LTBP Program will continue to evaluate the various promising collaboration opportunities discussed and assess how they can help meet the objectives of the program. The LTBP Program looks forward to continuing collaboration with industry partners and working together to improve knowledge and understanding of bridge performance.
Researchers—The FHWA LTBP Industry Day was conducted by FHWA Office of Infrastructure Research and Development and Rutgers, the State University of New Jersey. For additional information, contact Susan Lane in the Office of Infrastructure Research and Development, located at 6300 Georgetown Pike, McLean, VA 22101-2296.
Distribution—This TechBrief is being distributed according to a standard distribution. Direct distribution is being made to the Divisions and Resource Center.
Key Words—LTBP Program, bridge performance, performance, long-term bridge performance, Industry Day, industry LTBP collaboration.
Notice—This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document.
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