| Project/Area Number |
14550481
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | Osaka City University |
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Principal Investigator |
KITOH Hiroaki Osaka City University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (40177879)
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| Co-Investigator(Kenkyū-buntansha) |
FUMOTO Takayuki Osaka City University, Graduate School of Engineering, Research Associate, 大学院・工学研究科, 助手 (30315981)
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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 |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2003: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | concrete filled steel tube / ratio of diameter to thickness / confinement effect / compressive strength / failure mode / double tubular steel / ratio of inner tube's diameter and outer tube's diameter / 合成構造 / 中心圧縮載荷 / 制限径厚比 / 破壊形式 / 中心圧縮耐力 / 弾塑性鋼管応力 / 中心圧縮載荷実 / 局部座屈 |
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| Research Abstract |
Part1 : Mechanical behavior of concrete filled circular steel tubes with extremely thin walled tubes over the domestic limited ratio of diameter to thickness : D/t under centric compression was examined experimentally, with an economical view of application to the bridge columns. Twelve specimens ware prepared, where selected test parameters were D/t. and concrete strength. As a result, their strengths attained to the estimation values considering confinement effect of concrete beyond the simple accumulative strengths, if sufficient countermeasures were executed from the tube manufacturing to filled concrete placement stage. Furthermore, the observed failure modes were a diagonal slip of core concrete with an elephant foot like buckling at the end of the tubes.
Part2 : Centric axial loading tests of twelve specimens of concrete filled double tubular steel columns were carried out. The specimens consist of concentric double steel tubes and concrete filled between them. Experimental parameters were the ratio inner tube's diameter ; outer tube's diameter ; outer tube's thickness. Typical failure mode observed was a diagonal shear mode of the concrete associated with local buckling of both tubes. Their axial strength could be estimated by a similar equation for an ordinary concrete filled steel tube with a single tube.
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