| Project/Area Number |
14350245
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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 |
構造工学・地震工学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
OTSUKA Hisanori KYUSHU UNIVERSITY, DEPARTMENT OF CIVIL AND STRUCTURAL ENGINEERING, PROFESSOR, 工学研究院, 教授 (70108653)
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| Co-Investigator(Kenkyū-buntansha) |
MAZDA Taiji KYUSHU UNIVERSITY, DEPARTMENT OF CIVIL AND STRUCTURAL ENGINEERING, ASSOCIATE PROFESSOR, 工学研究院, 助教授 (50264065)
YABUKI Wataru KYUSHU UNIVERSITY, DEPARTMENT OF CIVIL AND STRUCTURAL ENGINEERING, RESEARCH ASSOCIATE, 工学研究院, 助手 (70304748)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2004: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2003: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2002: ¥7,800,000 (Direct Cost: ¥7,800,000)
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| Keywords | REINFORCED CONCRETE MEMBERS / COMBINED STRESSES INCLUDING TORSION / DYNAMIC HYSTERESIS / INTERACTION CURVES FOR AXIAL FORCES AND BENDING / 純ねじり / 非線形履歴 / 複合ねじり載荷試験装置 |
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| Research Abstract |
During 2002 to 2004, we conducted the experimental research to clarify the hysteresis of reinforced concrete members subjected to axial forces, bending and torsional moments. Experimental parameters are initial axial forces, pitch of hoop lateral ties, and ratios of bending loads and torsional loads. The following new conclusion is obtained by experimental results for 20 models.
About restoring characteristics,
1)The pitch of hoop lateral tie(HLT) remarkably affect for hysteresis loop for torsion, but not for bending.
2)In torsional load surpass type, energy absorption is also carried out by bending for poor HLT models (ctc=60mm), but is not carried out by bending for sufficient HLT models (ctc=30mm).
3)In case of sufficient HLT, amount of energy absorption for combined loading type is largest, but in case of poor HLT largest energy absorption member vary in accordance with surpass loading.
About interaction curves of bending and torsion,
1)Interaction curves become larger according to the increasing of the initial axial forces. The effect of pitch of HLT is few for crack and yield interaction curves, but it remarkably affect for ultimate strength interaction curves especially in torsion surpass region.
2)For normalized interaction relations, safety side interaction curves are proposed. Interaction curves for maximum strength of the member depend on the pitch of HLT.
3)The boundary of torsion surpass region and bending surpass region depend on the pitch of HLT. Therefore the further investigation to clarify the boundary is necessary.
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