Title:
Updating the ACI Shear Design Provisions
Author(s):
Evan C. Bentz and Michael P. Collins
Publication:
Concrete International
Volume:
39
Issue:
9
Appears on pages(s):
33-38
Keywords:
member, stirrups, crack, equation
DOI:
10.14359/51701012
Date:
9/1/2017
Abstract:
Shear provisions in ACI 318-14 Code have a few disadvantages that could be improved. For example, the provisions can provide overly conservative designs for members heavily loaded in shear and unconservative designs for deep one-way slabs without stirrups. The Code also contains eight separate equations to calculate the nominal shear strength provided by concrete. This article focuses on a method, based on first principles, to simplify shear provisions in the Code and address safety issues.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 519 pp.
2. Vecchio, F.J., and Collins, M.P., “The Modified Compression Field Theory for Reinforced Concrete Elements Subjected to Shear,” ACI Journal Proceedings, V. 83, No. 2, Mar.-Apr. 1986, pp. 219-231.
3. “fib Model Code for Concrete Structures 2010,” fib (International Federation for Structural Concrete), Lausanne, Switzerland, 2010, 434 pp.
4. “AASHTO LRFD Bridge Design Specifications,” seventh edition, American Association of State Highway and Transportation Officials, Washington, DC, 2014, 2160 pp.
5. Bentz, E.C., and Collins, M.P., “Development of the 2004 CSA A23.3 Shear Provisions for Reinforced Concrete,” Canadian Journal of Civil Engineering, V. 33, No. 5, May 2006, pp. 521-534.
6. Collins, M.P.; Bentz, E.C.; and Sherwood, E.G., “Where is Shear Reinforcement Required? Review of Research Results and Design Procedures,” ACI Structural Journal, V. 105, No. 5, Sept. Oct. 2008, pp. 590-600, and Appendix to ACI Paper, 49 pp.