Title: Tensile Behavior of Small Screw Anchors under Cyclic Crack Openings

Author(s): Chandani Chandra Neupane, Jessey Lee, Tilak Pokharel, Hing-Ho Tsang, and Emad Gad

Publication: Structural Journal

Volume:

Issue:

Appears on pages(s):

Keywords: anchorage in concrete; experimental study; finite element analysis; non-structural application; screw anchors; seismic performance

DOI: 10.14359/51740862

Date: 6/3/2024

Abstract:
Small-sized anchors (typically 6 mm (0.24 in.)) are commonly used for non-structural applications. There has been increasing demand for seismic performance of fastenings for non-structural applications, however, there has been no 6 mm (0.24 in.) size screw anchors with seismic prequalification for large crack width. This study investigated the feasibility of small-sized screw anchors to perform under tension loading in a crack width of up to 0.8 mm (0.03 in.). Tension tests were conducted in cracked concrete with varying crack widths (0.3 mm, 0.5 mm, 0.8 mm) (0.01 in., 0.02 in., 0.03 in.) under monotonic, pulsating, and varying crack width load protocol. Based on the findings of this study, 6 mm (0.24 in.) screw anchors exhibited load drop and slip behavior in large crack width during the residual capacity test even for anchors with a deeper embedment. Finite element analysis was conducted to investigate the feasibility of a larger size thread width to perform in 0.8 mm (0.03 in.) crack width.