Contribution of Stirrups to Shear Resistance

While the parallel chord truss model is a universally accepted model for evaluating the contributions of stirrups to the shear capacity of slender beams, codes-of-practice provide very different mean of evaluating the angle of diagonal compression of the struts in this truss model. This angle controls the contribution of shear reinforcement as the number of stirrups "n" to be counted as lifting the diagonal compressive force up a vertical tie in the truss is proportional to the cotangent of the angle of diagonal compression relative to the longitudinal axis of the beam. ACI318-08 assumes that this angle of diagonal compression is 45 degrees, while the AASHTO LRFD Bridge Design Specifications and EuroCode2 allow much flatter angles of diagonal compression to be used. The effect is that the contribution of in-place stirrups in a particular beam by one approach can be close to 3 times that calculated by another approach. The basis and appropriateness of different approaches are explored.

• Record URL:
  • https://doi.org/10.1061/41031(341)174
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784410318
• Supplemental Notes:
  • © 2009 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Kuchma, Daniel
• Conference:
  • Structures Congress 2009
  • Location: Austin Texas, United States
  • Date: 2009-4-30 to 2009-5-2
• Publication Date: 2009

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 1-8
• Monograph Title: Structures Congress 2009: Don't Mess with Structural Engineers: Expanding Our Role

Subject/Index Terms

• TRT Terms: Beams; Bridge design; Shear strength; Stirrups; Trusses
• Identifier Terms: AASHTO LRFD Bridge Design Specifications; CEB 90 Eurocode 2 model
• Subject Areas: Bridges and other structures; Design; Highways;

Filing Info

• Accession Number: 01922454
• Record Type: Publication
• ISBN: 9780784410318
• Files: TRIS, ASCE
• Created Date: Jun 24 2024 9:31AM