| 超高強度繊維補強コンクリート（Ductal）の構造性能評価 | |
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| −引張特性のモデル化と感度解析− | |
| 福浦 尚之・鵜沢 哲史・三桶 達夫・柄 登志彦・加納 宏一 | |
| 普通コンクリートと比較して超高強度と高靭性の性能を併せ持った鋼繊維補強反応性粉体コンクリート（Ｄｕｃｔａｌ）が開発され、土木・建築分野への適用が期待されている． 本研究は，Ｄｕｃｔａｌの引張特性を数値モデル化し，この引張り特性が部材挙動において大きな寄与をしていることを明らかにしたものである． まず，切り欠きをを有する試験体（10cm×10cm×40cm）の曲げ試験結果を逆解析してDuctalの引張応力−開口変位関係を数値モデル化し，曲げ引張強度の寸法効果を明らかにした．そして，これを基に部材設計において有用となる引張応力−ひずみ関係を導出し，実験との比較により，引張り特性のモデル化が合理的な設計に非常に重要であることを明らかにした． |
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| キーワード： | 反応性微粉末コンクリート，鋼繊維補強コンクリート，超高強度，高靭性，引張軟化，寸法効果 |
| Evaluation of Structural Performance of Ultra High Performance Fiber-reinforced Concrete (Ductal) | |
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| - Proposal of Tension Softening Diagram and Parametric Analyses - | |
| Naoyuki FUKUURA, Tetsushi UZAWA, Tatsuo MIOKE, Toshihiko TSUKA and Koichi KANO | |
| Ultra high performance fiber-reinforced concrete (Ductal) has good characteristics about flexural strength, shear strength and ductility. It is expected that the high cost-performance structure with Ductal would be constructed. This paper focuses on the evaluation of tension softening characteristics of Ductal. The following results were obtained; Based on the back-analysis of bending test of 10cm*10cm*40cm specimens, tension softening diagram was proposed. Size effect about flexural strength of Ductal beam was estimated through the diagram. Stress-strain relation derived from tension softening diagram showed good accordance with experimental beam performance, and it was verified that the proposed tension softening diagram could evaluate the structural performances and be convenient to performance-based structural design of Ductal beam. |
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| keywords: | reactive powder concrete, fiber reinforced concrete, ultra high-strength, high-ductility, Tension Softening, size effect |
| 02 - Report of Taisei Technology Center No.36 2003 |