Mechanism of nailed joints with decayed wood under lateral force

2016 Fiscal Year Final Research Report

• Project/Area Number: 26850107
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Wood science
• Research Institution: Hokkaido University
• Principal Investigator: Sawata Kei 北海道大学, 農学研究院, 講師 (10433145)
• Research Collaborator: Sasaki Yoshihisa 北海道大学, 大学院農学研究院, 技術職員 ; Saito Nozomi 北海道大学, 大学院農学院, 大学院生 ; Takanashi Ryuya 北海道立総合研究機構, 林産試験場, 研究職員
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 釘接合 / 荷重変位曲線 / 腐朽範囲 / 接合寸法 / 多数本釘打ち / 錆 / 初期剛性 / 終局荷重

Outline of Final Research Achievements

This study conducted on the nail withdrawal tests, bearing tests of wood, tests of joints connected with a nail under lateral force, and tests of multiple nailed joints. The nail withdrawal strength could be estimated by using corrosion of nail and decay degree of wood. The decay affected the bearing strength rather than the nail withdrawal strength. The ultimate load of the nailed joints decreased as the sum of the sound regions distance in the main and side members was decreased. The initial stiffness significantly decreased when the main or side member had a decayed region in the boundary between the main and side members. The decrease of ultimate load of multiple nailed joints was noticeable rather than that of initial stiffness. This study could obtain the mechanism of nailed joints under lateral force corresponding to the degree of decay and the displacement level of nailed joints.

Free Research Field

木質構造