DESIGN AND DETAILING WITH HEADED REINFORCEMENT FOR SEISMICALLY RESISTANT CONCRETE BRIDGE STRUCTURES

Headed reinforcement uses one or more anchorages, called heads, attached to the end(s) of steel reinforcing bars. Such heads serve to develop a bar in a relatively short distance, and can also better confine the interior concrete. For over a decade, headed reinforcement has had extensive field use in major structures subjected to cyclic fatigue and dynamic loading, as well as thorough laboratory testing on both bare steel bars as well as on concrete members with headed reinforcement. Such tests have also demonstrated the superior performance of headed reinforcement under seismic loading conditions, even in high moment zones, and joint regions. Presented here are the aspects of design and detailing with headed reinforcement for seismic resistance, and the aspects of concrete material performance as it is modified by headed reinforcement. Specific advanced design tools are discussed including empirical equations, strut-tie modeling procedures, a new membrane stress theory, and a new cyclic reinforcing bar bond-slip theory, together with design examples for bridge structures. Currently, ACI 349, CSA 474, and several overseas codes provide design rules for headed reinforcement. Where necessary these rules may be supplemented by experience, engineering judgement, empirical guidelines, and test results. New standards, regarding the use of headed reinforcement in concrete are pending with both ASTM and ACI 318; which when incorporated should further facilitate the design process.

• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Berner, D
  • Dahlgren, T
  • Dahl, K
• Publication Date: 1999

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 23-43
• Monograph Title: DEVELOPMENT OF SEISMIC STEEL REINFORCEMENT PRODUCTS AND SYSTEMS

Subject/Index Terms

• TRT Terms: Anchorages; Concrete bridges; Dynamic loads; Earthquake resistant structures; Reinforcing bars; Resistance tests; Seismicity; Structural design
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00779848
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 20 1999 12:00AM