Journal of Wood Science

, Volume 64, Issue 5, pp 601–611 | Cite as

Lateral strength of nailed timber connections with decay

  • Kei SawataEmail author
  • Yoshihisa Sasaki
Original Article


Loading tests were conducted on nailed connections with decay due to a brown rot fungus. The effect of the decay on the lateral strength of nailed connections was investigated. After loading tests, the sound and decayed regions of a nailed connection were observed in the cross section, which was cut parallel to the grain through the nailed point. The nailed connections with decay showed a low load during initial deformation when the main and side members had a decayed region in the boundary between them. The nailed connections showed low load after yielding when the sound region in the main member decreased. The yield load of nailed connections with decay was calculated based on the yield theory. The model of calculations had sound and decay regions within a member. The yield load of nailed connections obtained by the calculation based on the yield theory agreed with the results obtained by experiments when significant decay in a direction parallel to the grain was observed in the main and side members. This result indicates that the yield theory can estimate the yield load of nailed connections not only with a sound member, but also a member that is partly or wholly decayed.


Yield theory Yield mode Brown rot fungus Member thickness Yield load 



The authors wish to thank Ms. Nozomi Saito, Hokkaido University, for her assistance in the decay treatment. This work was supported by JSPS KAKENHI Grant numbers 26850107 and 17K07870.


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Copyright information

© The Japan Wood Research Society 2018

Authors and Affiliations

  1. 1.Research Faculty of AgricultureHokkaido UniversitySapporoJapan

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