ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.
Issue link: http://www.aspiremagazinebyengineers.com/i/295658
36 | ASPIRE , Spring 2014 F H WA I n the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for U s e r s ( S A F E T E A - L U ) , t h e U . S . C o n g r e s s directed the Secretary of the U.S. Department of Transportation to establish a 20-year study, develop grants, and enter into cooperative agreements and contracts to • monitor, material test, and evaluate test bridges; • analyze the data obtained; and • p r e p a r e p r o d u c t s t o f u l f i l l s t u d y objectiv es and meet futur e bridge technology needs. A c c o r d i n g l y, t h e F e d e r a l H i g h w a y Administration (FHWA) initiated a multifaceted research study in 2008 that is strategic in nature with short- and long-term goals. Under this study, referred to as the Long-Term Bridge Performance (LTBP) Program, critical aspects of bridge performance are being examined to better understand the per formance of existing and new bridges. The funding for the program has continued through MAP 21-The Moving Ahead for Progress in the 21st Century Act, which is a funding and authorization bill to govern United States federal surface transportation spending. The Research Team The LTBP Program's research team consists o f a c o o r d i n a t e d , c o l l a b o r a t i v e , m u l t i - institutional, and multi-disciplinar y group of professionals in government, academia, and industr y. FHWA is the lead agency. The primar y contractor is Rutgers Univ ersity, w o r k i n g i n p a r t n e r s h i p w i t h P a r s o n s Brinkerhoff; the Utah State University; the Virginia Center for Transportation Innovation and Research along with the University of Virginia and Virginia Tech; Bridge Diagnostic Inc.; and the technology provider, Advitam. T h e r e s e a r c h t e a m r e c e i v e s r e g u l a r i n p u t f r o m a d v i s o r y g r o u p s , s u c h a s t h e American Association of State Highway and Transportation Officials, state departments of transpor tation and the Transpor tation Research Board, to ensure that the research products are of value to the stakeholders. Developmental Phase In the developmental phase, researchers began to synthesize existing information o n b r i d g e p e r f o r m a n c e a n d i d e n t i f i e d per formance issues facing bridge owners i n t h e U n i t e d S t a t e s . B a s e d o n a v a i l a b l e resources, researchers developed a short list of high-priority bridge performance topics to be immediately considered for the long-term data collection phase of the LTBP Program. These topics include performance of treated and untreated concrete bridge decks, joints and bearings, coatings for steel superstructure e l e m e n t s , a n d e n c a p s u l a t e d p r e s t r e s s i n g strand and post-tensioning tendons. A f t e r i d e n t i f y i n g a p r i o r i t i z e d l i s t o f questions to be answered, the following steps were taken: 1. Examine the questions to identify the potential for data needs. 2. Design experiment s to identify the specific data to be collected. 3. D e t e r m i n e t h e f e a s i b i l i t y a n d economics of collecting reliable and quantitative data both from legacy sour ces and fr om LTBP Pr ogram's field monitoring activities. 4. Sort, store, and analyze data through t h e LT B P P r o g r a m d a t a p o r t a l t o address the question from step 1 and close the knowledge creation loop. The Long-Term Bridge Performance Program by Jorge E. Pagán-Ortiz and Hamid Ghasemi, Federal Highway Administration; M. Myint Lwin, formerly with Federal Highway Administration; and Ali Maher, Rutgers: The State University of New Jersey Various non-destructive evaluation technologies (impact echo, ground-penetrating radar, electrical resistivity, moisture scan, and half-cell potential) were deployed in the first pilot bridge to kick-off the Long-Term Bridge Performance Program. Photo: Federal Highway Administration. Demonstration of the RABIT TM bridge deck assessment tool at the U.S. 15 Bridge over I-66 in Haymarket, Va. Photo: Rutgers University. AspireBook_Spr14.indb 36 3/21/14 2:21 PM