Effect of the Bar Bend Radius on the Performance of Knee Joints with Common Details

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Title: Effect of the Bar Bend Radius on the Performance of Knee Joints with Common Details

Author(s): by Hwa-Ching Wang, Christopher S. Williams, and Gary J. Klein

Publication: Concrete International

Volume: 44

Issue: 10

Appears on pages(s): 49-56

Keywords: reinforcement, node, strength, ductility

DOI: 10.14359/51737255

Date: 10/1/2022

Abstract:
Load tests were conducted on knee joint specimens subjected to closing moments to evaluate the impact of transverse reinforcement in the joint region as well as the effects of longitudinal reinforcement details on the performance of the joints. The results indicate that the radius of the bar bend at the curved-bar node is critical to the joint performance, regardless of the presence of transverse reinforcement in the joint.

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. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (ACI 318R-02),” American Concrete Institute, Farmington Hills, MI, 2002, 445 pp.

3. 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.

4. Klein, G.J., “Curved-Bar Nodes,” Concrete International, V. 30, No. 9, Sept. 2008, pp. 42-47.

5. Wang, H.-C.; Williams, C.S.; and Klein, G.J., “Effect of Bend Radius of Reinforcing Bars on Knee Joints under Closing Moments,” ACI Structural Journal, V. 117, No. 5, Sept. 2020, pp. 315-326.

6. Wang, H.-C., “Behavior and Design of Concrete Frame Corners: Strut-and-Tie Method Approach,” PhD Dissertation, Purdue University, West Lafayette, IN, Dec. 2020, 336 pp.

7. Meinheit, D.F., and Jirsa, J.O., “Shear Strength of R/C Beam-Column Connections,” Journal of the Structural Division, V. 107, No. 11, Nov. 1981, pp. 2227-2244.

8. Zhang, L., and Jirsa, J.O., “A Study of Shear Behavior of Reinforced Concrete Beam-Column Joints,” Report on a Research Project Sponsored by National Science Foundation, Grant No. PFR-7720816, The University of Texas at Austin, Feb. 1982, 118 pp.

9. Hwang, S.-J.; Lee, H.-J.; Liao, T.-F.; Wang, K.-C.; and Tsai, H.-H., “Role of Hoops on Shear Strength of Reinforced Concrete Beam-Column Joints,” ACI Structural Journal, V. 102, No. 3, May/June 2005, pp. 445-453.

10. ASTM A767/A767M – 19, “Standard Specification for Zinc-Coated (Galvanized) Steel Bars for Concrete Reinforcement,” ASTM International, West Conshohocken, PA, May 2019, 6 pp.




  

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