| Project/Area Number |
10555147
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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 | 展開研究 |
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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) |
HAMADA Yuzuru DPS Bridge Works Co., Ltd., Research and Development Division, Assistant Manager, 技術センター, 副主任研究員
WATANABE Muneki Mitsui Construction Co., Ltd., Civil Engineering Division, Assistant General Manager, 土木本部・PC技術部, 部長代理(研究職)
MAKI Takeshi Saitama University, Faculty of Engineering, Research Associate, 工学部, 助手 (60292645)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1999: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1998: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | PRESTRESSED CONCRETE / EXTERNAL PRESTRESSING / CONTINUOUS PC BEAMS / LARGE ECCENTRICITIES |
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| Research Abstract |
Externally prestressed concrete has recently become popular in bridge structures. However, it has been known from past studies that the ultimate flexural strength of externally prestressed beams is comparatively lesser than that of similar internal bonded beams. One of the possible methods to enhance the flexural strength of externally prestressed beams is to place the tendons with large eccentricities. To verify the flexural behavior of such bridges, an experimental investigation was conducted using model test. In this study, a series of test was carried out on two span continuous beams consisting of different tendon layouts to obtain the fundamental mechanical behavior of such structures. The following conclusions are made from the test.
1) The flexural behavior of the beams was not affected by the linear transformation of the tendon layout. The presence of confinement reinforcement did not influence the ultimate strength of these beams.
2) The tendon stress increased proportionally to the midspan deformation until yielding of tendon. The type of loading arrangement influenced the rate of increase in external tendons. As such, the ultimate flexural strength of unsymmetrically loaded beams were reduced by about 20%.
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