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:
121
Issue:
5
Appears on pages(s):
161-174
Keywords:
anchorage in concrete; experimental study; finite element analysis; nonstructural application; screw anchors; seismic performance
DOI:
10.14359/51740862
Date:
9/1/2024
Abstract:
Small-sized anchors (typically 6 mm [0.24 in.]) are commonly used
for nonstructural applications. There has been increasing demand
for seismic performance of fastenings for nonstructural applications; however, there have 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 crack widths of up to 0.8 mm
(0.03 in.). Tension tests were conducted in cracked concrete
with varying crack widths (0.3, 0.5, and 0.8 mm [0.01, 0.02, and
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-sized thread width to perform
in 0.8 mm (0.03 in.) crack width.