Vol. 21, No. 5, pp. 390-412 (2025)
DESIGN OF SINGLE POST-INSTALLED STEEL SCREW ANCHOR: A NOMOGRAM
MODEL AND REASSESSMENT OF EUROCODE 2 PART 4
Ng Lieu Thai 1, Daniel Looi Ting Wee 1, 2, *, Jessey Lee 3, Adeline Ng Ling Ying 1 and S S Ajeesh 4
1 School of Engineering and Science, Swinburne University of Technology, Sarawak, Malaysia
2 School of Engineering and Technology, Sunway University, Selangor, Malaysia
3 Department of Civil and Construction Engineering, Swinburne University of Technology, Melbourne, Australia
4 Department of Civil Engineering, National Institute of Technology Calicut, India
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 30 October 2024; Revised: 18 February 2025; Accepted: 22 February 2025
DOI:10.18057/IJASC.2025.21.5.3
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ABSTRACT
EN 1992-4:2018 covers the design of post-installed steel screw anchors considering the tensile failure modes such as concrete cone failure, pull-out failure, concrete splitting failure, and steel failure. However, recent findings from the literature have shown that the prediction from the Concrete Capacity Design method, which is the basis for EN 1992-4:2018, may overpredict the resistances of screw anchors due to unique mechanical characteristics and failure behaviour of the screw anchor. Given that screw anchors are widely used in structural and non-structural applications, a graphical tool is presented in this paper that aims to review the design for screw anchors in EN 1992-4:2018 in order to bridge the gap in research knowledge. A novel approach through the introduction of a graphical tool (called nomogram) is proposed by collecting 197 experimental data and verified with four models from product European Technical Assessment (ETA) to provide a rapid and reliable estimation of the resistances (i.e., tensile and shear) of screw anchors for concrete-related failures. The predicted resistances are corroborated with experimental results, and it was shown that approximately 48% to 69% of the predicted results exceeded the experimental results if the coefficient of variation is ranging from 10% to 15%. In the majority of cases, the Concrete Capacity Design method can be unconservative compared to the experimental results. The nomogram is foreseen to be useful for quick preliminary estimation of screw anchor capacities without the need to use detailed design software. It can also serve as an independent verification tool for senior engineers reviewing designs prepared by junior engineers in consulting offices.
KEYWORDS
Screw anchor, Tensile resistance, Shear resistance, EC2-4 screw anchor verifications, Nomograms
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