| Project/Area Number |
18K04441
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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) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | パイルキャップ / せん断破壊 / せん断強度式 / 杭頭接合面破壊 / トラス・アーチ理論 / 鉄筋コンクリート造 / 杭基礎 / ト形部分架構 / 場所打ち杭 / 杭頭部曲げ破壊 / パイルキャップ内帯筋 / 偏心柱 / 帯筋量 / せん断終局強度 / 継続使用性 / 破壊性状 / 降伏破壊 |
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| Outline of Final Research Achievements |
Two types of evaluation formulas, an empirical formula and a theoretical formula, were proposed to obtain the ultimate shear strength of the pile cap in a reinforced concrete pile foundation in an explicit form. In the empirical formula, the shear strength could be evaluated on the safe side by considering the stress burden ratio of hoop stress at the time of pile cap shear failure. In the theoretical formula, the concept of the ultimate shear strength formula for column members based on the truss arch theory in the RC guideline of the Architectural Institute of Japan was applied. It was confirmed that the ultimate shear strength of the pile cap can be evaluated accurately by modifying the effective cross section.
It was found that damage to the pile head joint surface can be suppressed by arranging core bars as reinforcing bars on the pile head joint surface when the pile cap joint surface is destroyed.
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| Academic Significance and Societal Importance of the Research Achievements |
パイルキャップを設計する上で足りていない具体的な検討項目は，①杭基礎構造のおけるパイルキャップ高軸力下での終局耐力とせん断性能②杭頭接合部における抜出しを考慮したモーメント－回転角関係のモデル化が挙げられる。
実務設計では杭基礎を設計する際，未解明かつ評価困難ながら，既往実験式を外挿して用いている。外挿しても問題ないことの根拠を明確に示すことによって設計者が迷うことなく設計でき，しいては地震時における建物の損傷を抑えることにつながり，安心・安全なまちづくりを実現することができる。
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