Title:
Where is Shear Reinforcement Required? Review of Research Results and Design Procedures
Author(s):
Michael P. Collins, Evan C. Bentz, and Edward G. Sherwood
Publication:
Structural Journal
Volume:
105
Issue:
5
Appears on pages(s):
590-600
Keywords:
aggregate interlock; safety; shear; size effect; strain effect; strut-and-tie
DOI:
10.14359/19942
Date:
9/1/2008
Abstract:
This paper reviews the past 60 years of research on shear behavior with attention paid to the behavior of beams ranging from shortspan deep beams to members controlled by flexure. A database of 1849 tests is included and conclusions based on these tests are made concerning the safety of the shear provisions currently in use in North America. The paper concludes that using the current ACI shear provisions to decide where shear reinforcement is required can be unconservative for members with larger effective depths, or higher stresses in the longitudinal reinforcement. Improvements to the ACI Code are proposed to mitigate these weaknesses. The paper also demonstrates that the AASHTO-LRFD and Canadian CSA sectional and strut-and-tie provisions provide a more uniform level of safety for all member types.