Effective Depth of Rectangular and Circular Columns for Shear Strength Calculations

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Title: Effective Depth of Rectangular and Circular Columns for Shear Strength Calculations

Author(s): Halil Sezen, Sergio M. Alcocer, and Jack P. Moehle

Publication: Concrete International

Volume: 43

Issue: 7

Appears on pages(s): 37-41

Keywords: section, reinforcement, tension, compression

DOI: 10.14359/51732961

Date: 7/1/2021

Abstract:
Chapter 22 of the ACI 318-19 Code requires determination of the neutral axis depth before calculating the nominal shear strength at a section. However, the location of the neutral axis will vary with axial force and moment at a section. Thus, identical columns in a structure may have different depth values, leading to unnecessary complexity in building design. This article presents a procedure that simplifies the shear strength determination for reinforced concrete columns by eliminating the need to calculate the neutral axis depth.

Related References:

1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19),” American Concrete Institute, Farmington Hills, MI, 2019, 623 pp.

2. Kuchma, D.A.; Wei, S.; Sanders, D.H.; Belarbi, A.; and Novak, L.C., “Development of the One-Way Shear Design Provisions of ACI 318-19 for Reinforced Concrete,” ACI Structural Journal, V. 116, No. 4, July 2019, pp. 285-295.

3. ACI, “Standard Building Regulations for the Use of Reinforced Concrete (ACI Standard Specifications No. 23),” ACI Journal Proceedings, V. 16, No. 2, Feb. 1920, pp. 283-302.

4. ACI Committee E-1, “Tentative Building Regulations for the Use of Reinforced Concrete (E-1A-27T),” ACI Journal Proceedings, V. 23, No. 2, Feb. 1927, pp. 644-677.

5. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-99) and Commentary (ACI 318R-99),” American Concrete Institute, Farmington Hills, MI, 1999, 391 pp.

6. Joint ACI-ASCE Committee 426, “Shear Strength of Reinforced Concrete Members (ACI 426R-74),” Journal of the Structural Division, ASCE, V. 99, No. 6, June 1973, pp. 1148-1157.

7. Faradji, M.J., and Diaz de Cossio, R., “Diagonal Tension in Concrete Members of Circular Section,” Foreign Literature Study No. 466 (translated from Spanish), Portland Cement Association, Skokie, IL, 1966, 61 pp.

8. Khalifa, J.U., and Collins, M.P., “Circular Reinforced Concrete Members Subjected to Shear,” Publication No. 81-08, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, Dec. 1981, 117 pp.

9. Fenwick, R.C., and Paulay, T., “Mechanisms of Shear Resistance of Concrete Beams,” Journal of the Structural Division, ASCE, V. 94, No. 10, Oct. 1968, pp. 2325-2350.

10. Ghannoum, W.; Sivaramakrishnan, B.; Pujol, S.; Catlin, A.C.; Fernando, S.; Yoosuf, N.; and Wang, Y., “NEES: ACI 369 Rectangular Column Database,” 2015, www.datacenterhub.org/resources/255.

11. Ghannoum, W.; Sivaramakrishnan, B.; Pujol, S.; Catlin, A.C.; Fernando, S.; Yoosuf, N.; and Wang, Y., “NEES: ACI 369 Circular Column Database,” 2015, www.datacenterhub.org/resources/254.

12. Kakavand, M.R.A.; Sezen, H.; and Taciroglu, E., “Data-Driven Models for Predicting the Shear Strength of Rectangular and Circular Reinforced Concrete Columns,” Journal of Structural Engineering, ASCE, V. 147, No. 1, Jan. 2021.

13. ASCE/SEI 41-13, “Seismic Evaluation and Retrofit of Existing Buildings,” American Society of Civil Engineers, Reston, VA, 2014, 554 pp.

14. ACI Committee 369, “Standard Requirements for Seismic Evaluation and Retrofit of Existing Concrete Buildings (ACI 369.1-17) and Commentary,” American Concrete Institute, Farmington Hills, MI, 2017, 110 pp.




  

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