Torsion in High-Strength Concrete Hollow Beams: Strength and Ductility Analysis

To date, no studies have focused on high strength concrete (HSC) beams under pure torsion, even though HSC beams are more problematic than normal strength concrete beams and hollow beams are more problematic than plain beams as far as torsional ductility is concerned. This paper studies the ultimate behavior of HSC hollow beams with respect to their strength and ductility. Sixteen beams were tested. The hollow beams had a constant square cross section and were symmetrically reinforced. The variable parameters were the concrete?s compressive strength, from 46.2 to 96.7 MPa (from 6699 to 14,022 psi), and the total amount of torsional reinforcement, from 0.30 to 2.68%. The findings show that the torsional ductility is low and that the range of reinforcement ratio where ductility still occurs is very narrow. Different codes of practice were compared in the light of the experimental results, with the ACI Code appearing to be the most appropriate for predicting torsional strength and limiting torsion reinforcement. Some of the other codes were found to be excessively permissive and could lead to the acceptance of brittle beams or unsafe values of the predicted maximum torque.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339445
• Authors:
  • Bernado, Luis F A
  • Lopes, Sergio M R
• Publication Date: 2009-1

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 39-48
• Serial:
  • ACI Structural Journal
  • Volume: 106
  • Issue Number: 1
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-3241
  • Serial URL: http://www.concrete.org/PUBS/JOURNALS/SJHOME.ASP

Subject/Index Terms

• TRT Terms: Beams; Ductility; High strength concrete; Material reinforcement; Torsion; Ultimate strength
• Uncontrolled Terms: Hollow structural sections
• Subject Areas: Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete;

Filing Info

• Accession Number: 01122523
• Record Type: Publication
• Files: TRIS
• Created Date: Feb 23 2009 7:41AM