AN INVESTIGATION OF STRUT-AND-TIE MODELS FOR DAPPED BEAM DETAILS. INTERIM REPORT

The objective of the test program undertaken in this study was to develop experimental data for defining various elements of strut-and-tie models. The data were used extensively in establishing design guidelines for details of structural reinforced concrete (Report 1127-3F). The experimental program was divided into three phases. The first phase consisted of tests of four dapped beam details. A dapped beam was selected as a typical detail, commonly used in highway structures, and one for which several different design approaches have been proposed. Phases two and three consisted of tests of isolated portions (nodes) of the structure as modeled using the strut-and-tie approach. Nine CTT (compression-tension-tension) and ten CCT (compression-compression-tension) nodes were tested. At these nodes three forces converge at a point in the strut-and-tie model. Variables included reinforcement arrangement and layout, concrete strength, bearing area of the effective strut, and anchorage details. The results indicated that the dapped beam detail can be efficiently and effectively designed using a strut-and-tie model. The isolated node tests provide useful information on the performance of the concrete in the compression strut and on the anchorage of reinforcement in the node. The node tests provide an inexpensive way to determine critical data for developing design guidelines.

  • Supplemental Notes:
    • Research study title: Reinforcement Detail Design in Structural Concrete.
  • Corporate Authors:

    University of Texas, Austin

    Center for Transportation Research, 3208 Red River Street
    Austin, TX  United States  78705

    Texas Department of Transportation

    Transportation Planning Division, P.O. Box 5051
    Austin, TX  United States  78763

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Barton, D L
    • Anderson, R B
    • Bouadi, A
    • Jirsa, James O
    • Breen, J E
  • Publication Date: 1991-5

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 212 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00625747
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/TX-92+1127-1, Res Rept 1127-1, CTR 3-5-87/9-1127-1
  • Contract Numbers: Study 3-5-87/9-1127
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Oct 7 1996 12:00AM