Title:
Undercut Anchors for Seismic Applications
Author(s):
Philipp Mahrenholtz, Mark Ziegler, and Howard Silverman
Publication:
Concrete International
Volume:
45
Issue:
9
Appears on pages(s):
41-45
Keywords:
design, strength, load, steel
DOI:
10.14359/51739134
Date:
9/1/2023
Abstract:
Undercut anchors reliably transfer high static and cyclic loads into concrete by a robust mechanical interlock. To evaluate performance of post-installed anchors, the design strength was compared for three types of mechanical anchors (undercut anchor, screw anchor, and expansion anchor) and one adhesive anchor embedded in concrete and the load-displacement performance was compared for an undercut and adhesive anchor.
Related References:
1. ACI Committee 355, “Qualification of Post-Installed Mechanical Anchors in Concrete and Commentary (ACI 355.2-19),” American Concrete Institute, Farmington Hills, MI, 2019, 91 pp.
2. ACI Committee 355, “Qualification of Post-Installed Adhesive Anchors in Concrete and Commentary (ACI 355.4-19),” American Concrete Institute, Farmington Hills, MI, 2019, 56 pp.
3. ASTM F1554-20, “Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength,” ASTM International, West Conshohocken, PA, 2020, 8 pp.
4. 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.
5. ACI Committee 349, “Code Requirements for Nuclear Safety-Related Concrete Structures and Commentary (ACI 349-13),” American Concrete Institute, Farmington Hills, MI, 2014, 196 pp.
6. Mahrenholtz, P.; Ziegler, M.; and Watkins, D., “Undercut Anchors for Structural Applications,” STRUCTURE, Apr. 2022, pp. 22-25.
7. Mahrenholtz, P., and Wood, R.L., “Design of Post-Installed and Cast-in-Place Anchors According to the New EN 1992-4 and ACI 318-19,” Structural Concrete, V. 22, No. 2, Apr. 2021, pp. 650-665.