| Project/Area Number |
11450177
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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 |
OHTA Toshiaki KYUSHU UNIVERSITY, Faculty of Engineering , Prof., 大学院・工学研究院・建設デザイン部門, 教授 (70037753)
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| Co-Investigator(Kenkyū-buntansha) |
KATSUKI Satoshi National Defense Academy., Faculty of Engrg, Ass.Prof., システム工学群・建設環境工学科, 助教授
HINO Shinichi KYUSHU UNIVERSITY, Faculty of Engineering, Ass.Prof., 大学院・工学研究院・建設デザイン部門, 助教授 (00136532)
ISHIKAWA Nobutaka National Defense Academy., Faculty of Engrg, Prof., システム工学群・建設環境工学科, 教授
HARADA Kouji Nishimatsu Construction Co., Ltd, Resercher, 技術研究所, 研究員
SONODA Yoshimi KYUSHU UNIVERSITY, Faculty of Engineering, Ass.Prof., 大学院・工学研究院・建設デザイン部門, 助教授 (40304737)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥11,400,000 (Direct Cost: ¥11,400,000)
Fiscal Year 2000: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 1999: ¥6,000,000 (Direct Cost: ¥6,000,000)
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| Keywords | impulsive vertical load / push-up impact test / circumferential crack / stress wave / fiber reinforced concrete |
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| Research Abstract |
This research deals with a fundamental study on the damage of reinforced concrete (RC) column by the vertical earthquake load. First, the push-up apparatus was developed in order to reappear the circumferential crack phenomenon of RC pier in 1995 Hyogo-ken Nanbu earthquake. The followings were confirmed from the impulsive push-up experiments (1) Impulsive vertical motion during the earthquake could induce the circumferential crack of RC pier, (2) A circumferential crack was occurred by the tensile force due to the inertia force of negative acceleration and surcharge weight.
Next, high-speed horizontal loading tests were performed on the damaged RC columns after the push-up impact test in order to examine the influence of circumferential crack on the strength and ductility. It was found that the ultimate strength and deformability of damaged specimens were about 10〜17% and 15〜40% less than undamaged specimens, respectively. Finally, the effect of various reinforcements (steel jacket, carbon fiber, etc) under the impulsive vertical load were examined, and recognized that fiber reinforcement could be the same effective as steel jacket reinforcement to the vertical earthquake load.
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