Abstract
The purpose of this study is to accumulate of knowledge of nuki-column joint using hardwood with a small cross section in order to expand the demand for hardwood that has excellent mechanical performance as a building construction material. A nuki-column joint is one of the traditional Japanese timber joints. This joint consists of a small beam, called nuki, and a column. The authors conducted moment-resistance tests of nuki-column joints using hardwood as a whole or part of the nuki, and grasped the effect and performance of using hardwood at the joints. In this report, the relationships between the moment-resistance performances of the joints with hardwood as reinforcements and the compression perpendicular to the grain performances of the reinforcements were shown. In addition, these relationships were compared to the ones between the moment-resistance performances of the hardwood-nuki and column joints and the compression perpendicular to the grain performances of the nuki. On the other hand, to quantitatively evaluate the rigidity of the post-surrender, we proposed a simple tri-linear replacement method for the test results. As a result, the relationship between the moment-resistance performance of the joint that had the hardwood 24 mm thickness reinforcement over entire length of nuki and the compression perpendicular to the grain performance of the reinforcement had the same tendency as the relationship between the moment-resistance performance of the joints with whole-hardwood nuki and the compression perpendicular to the grain performance of the nuki. In addition, from the characteristic values calculated by our method, we were able to grasp the difference in the joint behavior after the yield point depending on the length of the reinforcements.
