2022 Fiscal Year Final Research Report
Development of prediction method for long-term deformation RC structures applying post-installed adhesive anchor
| Project/Area Number |
20K04776
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 23010:Building structures and materials-related
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| Research Institution | Shibaura Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 接着系あと施工アンカー / クリープ特性 / 温度依存性 / 小型試験装置 / 変形予測 |
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| Outline of Final Research Achievements |
In this study, a simple prediction method for long-term deformation of adhesive post-installed anchors was developed, taking into account temperature fluctuations in real environments.
To evaluate the temperature dependence of creep properties, an ultra-compact creep test apparatus (mass: approx. 20 kg, height: approx. 30 cm) was developed, in which high nuts and bolts were used as test specimens and a sustained load was applied with a steel frame. This enables evaluation of creep properties in a relatively short period of time in a constant-temperature, constant-humidity chamber.
The results obtained from these tests were extrapolated to a four-element viscoelastic model (Voigt model), and the temperature dependence of rheological property values was formulated. This has demonstrated a method for predicting long-term deformation under a variety of temperature conditions.
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| Free Research Field |
建築材料・施工
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| Academic Significance and Societal Importance of the Research Achievements |
接着系あと施工アンカーは、既存建築物における構造部材の接合などに適用可能であるが、長期荷重に対するクリープ特性の評価が必要不可欠である。従来の評価方法では、装置が大きく時間も要することから様々な温度条件下で試験を行うことは困難であったが、本研究で開発した試験装置および評価の考え方により、実環境下での長期変形量が簡易的に実施可能であり、既存建築物の長期利活用に有効な評価手法となる。
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