Tensile Behavior of Small Screw Anchors under Cyclic Crack Openings

TY - JOUR

T1 - Tensile Behavior of Small Screw Anchors under Cyclic Crack Openings

AU - Neupane, Chandani Chandra

AU - Lee, Jessey

AU - Pokharel, Tilak

AU - Tsang, Hing Ho

AU - Gad, Emad

N1 - Publisher Copyright: © 2024, American Concrete Institute. All rights reserved.

PY - 2024/9/1

Y1 - 2024/9/1

N2 - 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.

AB - 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.

KW - anchorage in concrete

KW - experimental study

KW - finite element analysis

KW - nonstructural application

KW - screw anchors

KW - seismic performance

U2 - 10.14359/51740862

DO - 10.14359/51740862

M3 - Article

AN - SCOPUS:85204286579

SN - 0889-3241

VL - 121

SP - 161

EP - 174

JO - ACI Structural Journal

JF - ACI Structural Journal

IS - 5

ER -