| Project/Area Number |
17360202
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Gunma University |
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Principal Investigator |
TSUJI Yukikazu Gunma University, Faculty of Eng., Professor, 工学部, 教授 (50048922)
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| Co-Investigator(Kenkyū-buntansha) |
MUTSUYOSHI Hiroshi Saitama University, Graduate School of Eng., Professor, 大学院・理工学研究科, 教授 (60134334)
SUGIYAMA Takafumi Hokkaido University, Graduate School of Eng., Professor, 大学院・工学研究科, 教授 (70261865)
KISHI Toshiharu The University of Tokyo, Institute of Industrial Science, Associate Professor, 生産技術研究所, 助教授 (90251339)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥12,700,000 (Direct Cost: ¥12,700,000)
Fiscal Year 2006: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2005: ¥9,700,000 (Direct Cost: ¥9,700,000)
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| Keywords | Chemical prestress / High performance concrete / Composite steel structure / Flexural Behavior / Chemical prestrain / Expansive concrete / Fiber reinforcements / Expansive strain / 土木材料 / 構造・機能材料 |
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| Research Abstract |
In this study, in order to experimentally investigate the flexural behaviors of high performance composite structures, trial combinations of high strength expansive concrete and fiber reinforcements were carried out. Fiber reinforcements consist of short fibers and continuous fiber reinforcements. A depth of reinforced concrete member is limited to 10 cm. Target compressive strength of expansive concrete is larger than 80N/mm^2. High strength expansive concrete can be applied to composite steel structures for the purpose of not only to protect steel corrosion but also to introduce chemical prestress effectively by using higher expansive energy of the expansive concrete.
High performance composite structures can be attained by the prominent combination of steel members and high strength fiber reinforced expansive concrete. From the research results, a design method of high performance composite structures is proposed and following items are gained.
1)High strength expansive concrete with
… More
short carbon fibers or short vinyl fibers can be manufactured. Compressive strength of the expansive concrete is larger than 80N/mm^2.after selecting appropriate combinations of not only mix design of concrete but also quantity of high performance expansive additive and content of short fibers.
2)Chemical prestrains are lineally distributed across the height of composite steel girders if bond strength between a concrete slab and a steel girder is strong more than enough. However linear distributions of chemical prestrain could not be gained for the height direction if the poor bond strength is existed around a edge of the girder. The phenomena can be seen easily for the higher composite steel girders.
3)Though longitudinal chemical prestrains at the upper position of the steel girder are strongly affected, chemical prestrains are a little larger at the position far from the steel girder due to weaker restraint by the steel girder.
4)Higher flexural behaviors of the composite steel girder can be attained if the bond strength between concrete and steel girder were strong enough. Therefore the effect of chemically prestressed concrete depends on the soundness and degree of the bond strength.
5)Radial directional work-done by the expansive concrete is almost the same as that of uni-axial A method restraint even if the thickness of inner steel pipe and of outer steel pipe are varied about five times. Less
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