Experimental Analysis of the Influence of the Fastener Type on the Embedment Strength Parallel to the Grain in Glued Laminated Timber
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 2
Abstract
Embedment strength is an important parameter that governs the ductile load-carrying capacity of timber joints with dowel-type fasteners. This property is dependent upon several factors, especially on the surface conditions of fasteners. In current design standards, however, the embedment strength depends only on the timber density and the diameter of fastener, though the surface conditions of dowels and fully threaded bolts are different. In this study, embedment tests for dowels, fully threaded bolts and glued-in rods in the direction parallel to the grain were carried out. Comparisons with the existing design equations in Eurocode 5 Design of Timber Structures (EC5) and American National Design Specification (NDS) were performed. It is found that the embedment strength in timber for dowels can be accurately predicted by EC5 and NDS, while the embedment strength for fully threaded bolts is underestimated. In addition, the embedment strength for glued-in rods is not addressed in the current design standards. Based on the presented experimental results, new empirical expressions for the embedment strength parallel to the grain in timber for fully threaded bolts and glued-in rods were proposed.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request, including density, load capacity, and embedment strength.
Acknowledgments
The authors gratefully acknowledge the support of The Creative Research Groups of the National Natural Science Foundation of China under the Grant No. 51421064 and The Fundamental Research Funds for the Central Universities under the Grant No. DUT19LK48.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 2 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 29, 2020
Accepted: Aug 3, 2020
Published online: Nov 20, 2020
Published in print: Feb 1, 2021
Discussion open until: Apr 20, 2021
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