Title:
Analytical Evaluation of Deep Beams with High-Strength Headed Shear Reinforcement, Part II
Author(s):
Dhanushka K. Palipana and Giorgio T. Proestos
Publication:
Structural Journal
Volume:
121
Issue:
3
Appears on pages(s):
147-158
Keywords:
deep beams; finite element modeling; headed reinforcement; high strength; reinforced concrete; shear; strut-and-tie
DOI:
10.14359/51740487
Date:
5/1/2024
Abstract:
The use of normal-strength (Grade 60) and high-strength (Grade 80) headed bars as transverse reinforcement can improve the constructability of reinforced concrete structures. However, the ACI 318-19 Code does not allow the use of headed bars as transverse reinforcement in deep beams. ACI 318-19 also does not allow engineers to take advantage of the increased yield strength of Grade 80 reinforcement for use as shear reinforcement. This paper presents an analytical evaluation of shear-critical deep beams that use high-strength headed reinforcement. Six recently conducted largescale experiments are modeled using the two-parameter kinematic theory, the nonlinear finite element tool VecTor2, and strut-and-tie methods described in codes. The predictions are compared with experimental results. A parametric study is conducted to evaluate the influence of the quantity of transverse reinforcement and yield stress of the transverse reinforcement on the response of shearcritical deep beams.
Related References:
1. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19) (Reapproved 2022),” American Concrete Institute, Farmington Hills, MI, 2019, 624 pp.
2. AASHTO, “AASHTO LRFD Bridge Design Specifications and Commentary,” ninth edition, American Association of State Highway Transportation Officials, Washington, DC, 2020, 1912 pp.
3. Proestos, G.; Bae, G.; Cho, J.; and Bentz, E., “Influence of High-Strength Bars on Shear Response of Containment Walls,” ACI Structural Journal, V. 113, No. 5, Sept.-Oct. 2016, pp. 917-927. doi: 10.14359/51688750
4. Munikrishna, A.; Hosny, A.; Rizkalla, S.; and Zia, P., “Behavior of Concrete Beams Reinforced with ASTM A1035 Grade 100 Stirrups under Shear,” ACI Structural Journal, V. 108, No. 1, Jan.-Feb. 2011, pp. 34-41.
5. Lee, J.; Choi, I.; and Kim, S., “Shear Behavior of Reinforced Concrete Beams with High-Strength Stirrups,” ACI Structural Journal, V. 108, No. 5, Sept.-Oct. 2011, pp. 620-629.
6. Yoshida, Y., “Shear Reinforcement for Large Lightly Reinforced Concrete Members,” MASc thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 2000, 160 pp.
7. Lequesne, R. D.; O’Reilly, M.; Darwin, D.; Lepage, A.; Al-Sabawy, A.; Guillen, E.; and Spradling, D., “Use of Headed Bars as Shear Reinforcement,” The University of Kansas Center for Research, Inc., Lawrence, KS, 2018, 256 pp.
8. Forest, S. B., “Anchorage of Single Leg Stirrups in Reinforced Concrete Slabs and Walls,” MASc thesis, Department of Civil Engineering, University of Toronto, Toronto, ON, Canada, 2019, 253 pp.
9. Yang, Y.; Varma, A. H.; Kreger, M. E.; Wang, Y.; and Zhang, K., “Shear Strength of Reinforced Concrete Beams with T-Headed Bars for Safety Related Nuclear Structures,” Engineering Structures, V. 230, 2021, p. 111705. doi: 10.1016/j.engstruct.2020.111705
10. CSA A23.3-19, “Design of Concrete Structures,” CSA Group, Toronto, ON, Canada, 2019, 301 pp.
11. Palipana, D. K., “Assessment of Shear Transfer Mechanisms in reinforced Concrete Deep Beams from Experiments with Full Field-of-View Displacement Field Data,” PhD thesis, North Carolina State University, Raleigh, NC, 2023. 440 pp.
12. Mihaylov, B. I.; Bentz, E. C.; and Collins, M. P., “Two-Parameter Kinematic Theory for Shear Behavior of Deep Beams,” ACI Structural Journal, V. 110, No. 3, May-June 2013, pp. 447-456.
13. Trandafir, A. N.; Palipana, D. K.; Proestos, G. T.; and Mihaylov, B. I., “Framework for Crack-Based Assessment of Existing Lightly Reinforced Concrete Deep Beams,” ACI Structural Journal, V. 119, No. 1, Jan. 2022, pp. 255-266.
14. Palipana, D. K.; Trandafir, A. N.; Mihaylov, B. I.; and Proestos, G. T., “Framework for Quantification of Shear Transfer Mechanisms from Deep Beam Experiments,” ACI Structural Journal, V. 119, No. 3, May 2022, pp. 53-65.
15. ASTM A370-21, “Standard Test Methods and Definitions for Mechanical Testing of Steel Products,” ASTM International, West Conshohocken, PA, 50 pp.
16. Proestos, G. T.; Palipana, D. K.; and Mihaylov, B. I., “Evaluating the Shear Resistance of Deep Beams Loaded or Supported by Wide Elements,” Engineering Structures, V. 226, 2021, p. 111368. doi: 10.1016/j.engstruct.2020.111368
17. Palipana, D. K., and Proestos, G. T., “Large-Scale Shear Critical Reinforced Concrete Deep Beam Experiments Monitored with Full Field of View Digital Image Correlation Equipment,” 26th International Conference on Structural Mechanics in Reactor Technology (SMiRT-26), Berlin/Potsdam, Germany, 2022.
18. Vecchio, F. J., and Collins, M. P., “The Modified Compression-Field Theory for Reinforced Concrete Elements Subjected to Shear,” ACI Structural Journal, V. 83, No. 2, Mar.-Apr. 1986, pp. 219-231.
19. Vecchio, F. J., “Disturbed Stress Field Model for Reinforced Concrete: Implementation,” Journal of Structural Engineering, ASCE, V. 127, No. 1, 2001, pp. 12-20. doi: 10.1061/(ASCE)0733-9445(2001)127:1(12)
20. Wong, P. S.; Vecchio, F. J.; and Trommels, H., “VecTor2 & FormWorks User’s Manual,” second edition, Toronto, ON, Canada, 2013.
21. Collins, M. P., and Mitchell, D., Prestressed Concrete Structures, Response Publication, Canada, 1997, 766 pp.
22. Joint ACI-ASCE Committee 445, “Strut-and-Tie Method Guidelines for ACI 318-19—Guide (ACI PRC-445-21),” American Concrete Institute, Farmington Hills, MI, 2021, 88 pp.
23. Li, Y.; Chen, H.; Yi, W.; Peng, F.; Li, Z.; and Zhou, Y., “Effect of Member Depth and Concrete Strength on Shear Strength of RC Deep Beams without Transverse Reinforcement,” Engineering Structures, V. 241, 2021, p. 112427. doi: 10.1016/j.engstruct.2021.112427