Development of a method for evaluating the long-term strength performance of wood structural materials

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14893
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 40020:Wood science-related
• Research Institution: Hokkaido University (2023); Hokkaido Research Organization (2021-2022)
• Principal Investigator: Takanashi Ryuya 北海道大学, 農学研究院, 助教 (80733112)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 荷重継続時間 / Duration of load / 木質接着材料 / カラマツ / 集成材 / 直交集成板

Outline of Final Research Achievements

Lumber, finger-jointed timber, glulam, and cross laminated timber specimens were made from Japanese larch lumber, and the long-term bending test was conducted. We showed that glulam and resorcinol resin bonded finger-jointed timber specimens exhibited longer duration of load. Based on this study and existing data, an evaluation method for long-term strength performance of a specimen was developed. This method consists of assessing an instantaneous failure probability compared to that of a standard material. In addition, it is shown that the duration of load performance of an element member that contributes to the failure of a whole material represents that of a whole material.

Free Research Field

木材工学

Academic Significance and Societal Importance of the Research Achievements

接着積層材料を主な対象として、構成要素に応じた長期強度特性のデータが体系的に整備された。また、接着剤の種類による荷重継続時間への影響が明らかとなった。体系化され示された長期材料強度特性および、提案された荷重継続時間の評価手法は、木質構造材料の長期強度性能を評価する際の合理的な試験・評価手法となりうる。これにより、評価対象となる材料の長期強度性能の評価が簡略化され、新規木質構造材料の材料認定で障壁となっていた長期強度データ収集の実施難易度が下がることが期待される。木質構造材料の開発促進が期待される。