Moisture Preparation and Bending Performance of Metal Plate Connected C24 Spruce Members in an Exploratory Comparison of Two Connector Systems
- 1Department of Mechanical Wood Technology, Poznań University of Life Sciences, 60-637 Poznań, Poland
- 2SODRA POLSKA sp. z o.o., Gdyńska 15A, 62-028 Koziegłowy, Poland
- 3Department of Materials Strength and Structural Diagnostics, Kielce University of Technology, 25-314 Kielce, Poland
Abstract
Moisture preparation, moisture at testing, and timber variability can jointly influence the response of metal-plate-connected (MPC) members. This exploratory re-analysis concerns 18 C24 Norway spruce assemblies (45 × 170 mm) with Mitek T150 or Ristek LL13 plates. The principal comparison includes 14 directly conditioned specimens in nominal 15%, 20%, and 40% preparation groups, with only two or three beams per connector–group cell; four moisture-transition specimens are described separately. Pooled mean ultimate loads were 14.15, 11.41, and 10.22 kN, respectively. An additive model summarized a nominal-group association (F(2,10) ≈ 12.29, p ≈ 0.002; bias-reduced, nonpartial ω2 ≈ 0.587), but this estimate remains uncertain in such a small sample. The connector comparison was inconclusive (p ≈ 0.122), rather than evidence of equivalent performance. In the nominal 40% group, reported mean moisture differed substantially between Mitek and Ristek (40.45% and 26.35%), and resistance-meter readings in the wet range lack documented validation. Separate verified moisture records at pressing and testing, and the timber-allocation procedure, are not documented. Consequently, preparation history, test-state moisture, connector system, and possible timber-batch differences cannot be separated causally. Laboratory coupons were summarized at the parent-beam level, without treating subsamples as independent treatment replicates. The findings identify associations requiring a balanced, replicated experiment; they do not establish an assembly-moisture effect, a connector ranking, or a design reduction factor.
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BibTeX
@article{wieruszewski2026moisture,
title = {{Moisture Preparation and Bending Performance of Metal Plate Connected C24 Spruce Members in an Exploratory Comparison of Two Connector Systems}},
author = {Marek Wieruszewski and Weronika Magdziak and Arkadiusz Gronowski and Agnieszka Katarzyna Wdowiak-Postulak},
journal = {Polymers},
year = {2026},
month = sep,
doi = {10.3390/polym18192393},
url = {https://europepmc.org/article/PMC/PMC13666639},
note = {CC BY},
}
RIS
TY - JOUR
TI - Moisture Preparation and Bending Performance of Metal Plate Connected C24 Spruce Members in an Exploratory Comparison of Two Connector Systems
AU - Marek Wieruszewski
AU - Weronika Magdziak
AU - Arkadiusz Gronowski
AU - Agnieszka Katarzyna Wdowiak-Postulak
PY - 2026
DA - 2026/09/30
JO - Polymers
DO - 10.3390/polym18192393
UR - https://europepmc.org/article/PMC/PMC13666639
AB - Moisture preparation, moisture at testing, and timber variability can jointly influence the response of metal-plate-connected (MPC) members. This exploratory re-analysis concerns 18 C24 Norway spruce assemblies (45 × 170 mm) with Mitek T150 or Ristek LL13 plates. The principal comparison includes 14 directly conditioned specimens in nominal 15%, 20%, and 40% preparation groups, with only two or three beams per connector–group cell; four moisture-transition specimens are described separately. Pooled mean ultimate loads were 14.15, 11.41, and 10.22 kN, respectively. An additive model summarized a nominal-group association (F(2,10) ≈ 12.29, p ≈ 0.002; bias-reduced, nonpartial ω2 ≈ 0.587), but this estimate remains uncertain in such a small sample. The connector comparison was inconclusive (p ≈ 0.122), rather than evidence of equivalent performance. In the nominal 40% group, reported mean moisture differed substantially between Mitek and Ristek (40.45% and 26.35%), and resistance-meter readings in the wet range lack documented validation. Separate verified moisture records at pressing and testing, and the timber-allocation procedure, are not documented. Consequently, preparation history, test-state moisture, connector system, and possible timber-batch differences cannot be separated causally. Laboratory coupons were summarized at the parent-beam level, without treating subsamples as independent treatment replicates. The findings identify associations requiring a balanced, replicated experiment; they do not establish an assembly-moisture effect, a connector ranking, or a design reduction factor.
SN - 2073-4360
ER -