Testing and modeling of CLT-to-CLT joints made using hardwood dowels and screws with varying spacing

Vilguts, Aivars; Phillips, Adam R.; Antonopoulos, Chrissi; Griechen, Darrin

doi:10.1016/j.conbuildmat.2024.139449

Testing and modeling of CLT-to-CLT joints made using hardwood dowels and screws with varying spacing

Journal Article · Wed Dec 11 23:00:00 EST 2024 · Construction and Building Materials

DOI:https://doi.org/10.1016/j.conbuildmat.2024.139449· OSTI ID:2564590

Vilguts, Aivars ^[1]; Phillips, Adam R. ^[1]; ^[2]; Griechen, Darrin ^[3]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Green Canopy NODE, Seattle, WA (United States)

With the increasing popularity of mass timber, utilizing large-diameter wood screws and hardwood dowels can offer an easy and cost-efficient way to join structural elements. However, the existing research on hardwood dowels is limited to single fastener joints under monotonic loading. No research is available on the group effects of joints with multiple hardwood dowels. Here, this paper presents the results of 96 monotonic and cyclic single-shear plane CLT-to-CLT joint tests with hardwood dowels (Red Oak and Yellow Birch, 25.4 mm diameter) and self-tapping wood screws (8 mm diameter) in Grand-Fir CLT, where screws were inserted both perpendicular and at a 45-degree angle to the grain for comparison to hardwood dowels. The study evaluated the mechanical properties of the joints by changing fastener spacing. Mechanical properties such as yielding and peak strength, displacement, elastic and yielding stiffness, and ductility were evaluated. The results showed equal strength and stiffness properties for hardwood dowels comparable with large-diameter screws. Additionally, the hardwood dowel joints demonstrated moderate ductility properties. The strength and stiffness of the tested joints were compared with analytical equations found in the literature by considering the group action factor of the fasteners. Lastly, a nonlinear force-displacement model was presented and compared to the experimental results and analytical calculations, which gives the possibility to predict and optimize the mechanical behavior of hardwood dowel and screw joints with varying numbers and spacing between fasteners.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC05-76RL01830; AR0001810

OSTI ID:: 2564590

Alternate ID(s):: OSTI ID: 2480976

Report Number(s):: PNNL-SA--202286

Journal Information:: Construction and Building Materials, Journal Name: Construction and Building Materials Vol. 458; ISSN 0950-0618

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Cross-laminated timber
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