Shear in Discontinuity Regions

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Title: Shear in Discontinuity Regions

Author(s): Gary J. Klein, Nazanin Rezaei, David Garber, and A. Koray Tureyen

Publication: Concrete International

Volume: 41

Issue: 5

Appears on pages(s): 36-41

Keywords: strength, D-region, strut-and-tie, beam

DOI: 10.14359/51716777

Date: 5/1/2019

Abstract:
The article describes the rationale for changes in ACI 318-19 that will address concerns and inconsistencies related to shear strength of deep beams and D-regions while maintaining the essential characteristics of design according to the strut-and-tie method. The changes in the Code relate to the strength of struts and requirements for minimum distributed reinforcement. Analyses of data from previous studies and a recent test program were used to evaluate the influence of diagonal tension on the strength of struts.

Related References:

1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (ACI 318R-02),” American Concrete Institute, Farmington Hills, MI, 2002, 443 pp.

2. Schlaich, J.; Schäfer, K.; and Jennewein, M., “Toward a Consistent Design of Structural Concrete,” PCI Journal, V. 32, No. 3, May-June 1987, pp. 74-150.

3. 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.

4. Laughery, L., and Pujol, S., “Compressive Strength of Unreinforced Struts,” ACI Structural Journal, V. 112, No. 5, Sept.-Oct. 2015, pp. 617-624.

5. Reineck, K.-H., and Todisco, L., “Database of Shear Tests for Non-Slender Reinforced Concrete Beams without Stirrups,” ACI Structural Journal, V. 111, No. 6, Nov.-Dec. 2014, pp. 1363-1372.

6. Reineck, K.-H.; Bentz, E.C.; Fitik, B.; Kuchma, D.A.; and Bayrak, O., “ACI-DAfStb Database of Shear Tests on Slender Reinforced Concrete Beams without Stirrups,” ACI Structural Journal, V. 110, No. 5, Sept.-Oct. 2013, pp. 867-875.

7. Rezaei, N.; Klein, G.; and Garber, D., “Struts Strength and Failure in Full-Scale Concrete Deep Beams,” ACI Structural Journal, V. 116, No. 3, May-June 2019, DOI: 10.14359/51713306.

8. Van den Hoogen, M.G.M., “Beam or Truss Mechanism for Shear in Concrete: Problems Converting a Beam into a Truss,” MSc. thesis, Department of Structural Engineering, Technical University Delft, Delft, the Netherlands, 2013, 128 pp.

9. Zsutty, T.C., “Shear Strength Prediction for Separate Categories of Simple Beams Tests,” ACI Journal Proceedings, V. 68, No. 2, Feb. 1971, pp. 138-143.

10. Bazant, Z., and Kim, J.-K., “Size Effect in Shear Failure of Longitudinally Reinforced Beams,” ACI Structural Journal, V. 85, No. 5, Sept.-Oct. 1984, pp. 456-468.

11. Belarbi, A.; Kuchma, D.A.; and Sanders, D.H., “Proposals for New One-Way Shear Equations for the 318 Building Code,” Concrete International, V. 39, No. 9, Sept. 2017, pp. 29-32.

12. Klein, G.; Botros, A.; Andrews, B.; and Holloway, K., “Dapped Ends of Prestressed Concrete Thin-Stemmed Members: Part 2, Design,” PCI Journal, V. 62, No. 2, Mar.-Apr. 2017, pp. 83-100.




  

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