| Project/Area Number |
14350230
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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 |
土木材料・力学一般
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| Research Institution | SAITAMA UNIVERSITY |
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Principal Investigator |
MUTSUYOSHI Hiroshi Saitama University, Faculty of Engineering, Professor, 工学部, 教授 (60134334)
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| Co-Investigator(Kenkyū-buntansha) |
MAKI Takeshi Saitama University, Faculty of Engineering, Research Associate, 工学部, 助手 (60292645)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2003: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2002: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | MITIGATION OF EARTHQUAKE DAMAGE / RC STRUCTURES / BOND CONTROL / DUCTILITY |
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| Research Abstract |
It is well known that a large amount of shear reinforcement enhances the shear capacity and ductility of RC members. Excessive use of reinforcements, however, can become counterproductive in terms of both constructability and economy. The main objective of this study is to examine how controlling the bond of the longitudinal reinforcements can improve seismic performance, such as shear strength and ductility of RC structures. An extensive experimental and analytical investigation was carried out in this study. The experimental study employed fifteen 300 x 300 mm square RC columns tested under reversed cyclic loading. The columns were of six different bond conditions, varying from the perfect bond with the use of ordinary deformed bars, to the perfect unbond. The other test variables included the shear span to depth ratio, the shear to flexural strength ratio, and the length of unbonded region. The results of the experiment revealed that the failure mode at the ultimate state could be changed from shear to flexure by reducing the bond strength of the longitudinal bars. The test results also showed that RC columns reinforced with bond controlled bars had significantly better shear strength and ductility than RC columns reinforced with ordinary bars. Three Dimensional nonlinear finite element analysis was also carried out to verify the enhancement of seismic performance of reinforced concrete bridge piers by controlling bond of longitudinal reinforcement. Proposed analytical method was found to model the global hysteretic behavior and failure mode of unbonded RC piers producing an excellent correlation with that of the experimental results.
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