Title:
Concrete Q&A: Using Threaded Deformed Reinforcing Bars as Anchor Rods
Author(s):
Donald F. Meinheit and Loring A. Wyllie Jr.
Publication:
Concrete International
Volume:
41
Issue:
7
Appears on pages(s):
75-76
Keywords:
DOI:
10.14359/51718035
Date:
7/1/2019
Abstract:
Q: We are planning to use threaded reinforcing bars as anchor rods for connection of base plates (of steel or precast columns) to cast-in-place foundation elements. We intend to specify that the bars are supplied with threaded heads. In ACI 318-14,1 it seems that the design of headed reinforcing bars could be governed either by Chapter 25—Reinforcement Details or Chapter 17—Anchoring to Concrete. However, the headed reinforcing bars shown in the commentary of Chapter 25 appear to be used in joints of concrete elements (for example, a beam framing into a wall or column) and subjected primarily to tension forces. In our application, the bars will anchor steel or precast elements to concrete and are subjected to tension forces, shear forces, or both. Can we use the provisions in Chapter 25 to design the anchor rods?
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. “The Reinforced Concrete Design Handbook,” SP-17, V. 1: Member Design, Taylor, A.; Hamilton III, T.; and Nanni, A., eds., American Concrete Institute, Farmington Hills, MI, 2016, pp. 354-374.