On strength and stiffness of screwed-in threaded rods embedded in softwood

•Existing literature and design guidelines for threaded rods were reviewed.•Test results were used to derive expressions for the axial capacity and stiffness.•Theoretical expressions for the lateral capacity and stiffness were provided.•Areas where further research is needed were highlighted. Screwe...

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Bibliographic Details
Published in:Construction & building materials 2020-11, Vol.261, p.119999, Article 119999
Main Authors: Stamatopoulos, Haris, Malo, Kjell Arne
Format: Article
Language:English
Subjects:
Angle to grain
Density
Diameter
EN1995-1-1
European Technical Approval/Assessment (ETA)
Penetration length
Threaded rod
Withdrawal
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Summary:•Existing literature and design guidelines for threaded rods were reviewed.•Test results were used to derive expressions for the axial capacity and stiffness.•Theoretical expressions for the lateral capacity and stiffness were provided.•Areas where further research is needed were highlighted. Screwed-in threaded rods with wood screw threads feature high axial capacity and stiffness and can be used as fasteners in highly resistant and stiff timber connections. The purpose of the present paper is to review the existing literature and design rules in the present version of Eurocode 5 (EN 1995-1-1) and European Technical Assessments, to identify gaps of knowledge and to provide some proposals for the strength and stiffness of threaded rods. A collection of experimental results is used to derive simple expressions for the withdrawal capacity and stiffness. Finally, theoretical expressions for the stiffness and the capacity of laterally-loaded threaded rods are provided.
ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2020.119999