Study on Nailed Joint with Iron Contamination. Part1: Shear Performance of Nailed Joint with Iron Contamination

IRG/WP 19-50349

R Nakano, D Nakano, H Ishiyama

In Japan, The building standard law was amended in 2000.1) The use of metal joint was obligated by this law. Since then, metal joints have been largely used for wooden buildings. Also, Act on the Promotion of Popularization of Long-life Quality Housing was enacted in 2009 and leaving Long-life Quality Housing has been focused on2). However, leaving houses to posterity for a long time causes several problems. One of the problems is degradation of members. When timbers and metals react, iron contamination is caused. This phenomenon has been considered problematic. This study verifIES what kind of influence iron contamination have which is caused by chemical reaction with timbers and metals to structural performance of timber and nails. Iron contamination and rusts were forced to be formed on the test specimen represented a connection of column and plywood on shear wall, and shear performance was checked at each stage. Regardless of the presence or absence in preservative treatment, when weight remaining ratio went down, maximum shear capacity increased. When weight remaining ratio went down less than 80%, the maximum shear capacity decreased. When iron contamination was formed, the maximum shear capacity increased. But, PuĂ—0.2/Ds which indicate ductIlity declined. Rust accelerated quicker on the specimen to which preservative treatments were applied than on the specimen to which no preservative treatments were applied.


Keywords: nail, timber, iron contamination, preservative treatments

Conference: 19-05-12/16 Quebec City, Canada


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