ULTIMATE STRENGTH AND DEFORMABILITY OF CONCRETE FILLED AND COVERED STEEL TUBE COLUMNS WITH SEVERAL MATERIAL COMBINATIONS
| Project/Area Number |
08455262
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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 |
Building structures/materials
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
NAKAMURA Yuji HIROSHIMA UNIVERSITY,FACULTY OF ENGINEERING PROFESSOR, 工学部, 教授 (40237441)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUO Akira HIROSHIMA UNIVERSITY,FACULTY OF ENGINEERING ASSOCIATE PROFESSOR, 工学部, 助教授 (90034412)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | CONCRETE FILLED STEEL TUBE / CONCRETE FILLED AND COVERED STEEL TUBE / GENERALIZED ADDITIONAL / ULTIMATE STRENGTH / PLASTIC DEFORMABILITY / HIGH STRENGTH CONCRETE / ORDINARY CONCRETE / CONFINED EFFECT / 充填型鋼管コンクリート / 高流動コンクリート / 鋼芯柱 |
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| Research Abstract |
The purposes of this research are to obtain the ultimate strength and the plastic deformability of concrete filled and covered steel tube columns with several material combinations and to seek the optimum material combinations. Ordinary and/or high strength concrete (Fc=240kg/cm^2 and Fc=500kg/cm^2) are used for covered and filled steel tube columns. And columns have circular tubes with large or small diameter, or wide flange sections at the center respectively.
Test specimens are sub-assemblages of cruciform consisted of columns and beams. They are loaded with repeated bending moments, which corresponds to severe seismic loadings, as well as vertical loading, 30% of axial force capcity of the columns simultaneously.
It is obtained from the experiment results that the generalized additional strength equations of columns can evaluate the ultimate strength of concrete filled and covered steel tube columns satisfactorily, even using high strength concrete. However, for columns using wide flange sections, it overestimates usually, and the ultimate strength of concrete outside of hoop reinforcement should be considered to be fc'=0.2fc. Moreover, the plstic deformability of columns with concrete filled and covered steel tube with larger diameter and with smaller diameter were judged to be considerably high, which corresponds to FA to the structural rank I and FB to the structural lank respectively defined with Japanese Building Standard Law.
Consequently, as the conclusions the ultimate strength of concrete covered and filled steel tube columns can be estimated with the generalized additional equations satisfactorily. And these columns are ductile to seismic forces.
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Report
(3 results)
Research Products
(3 results)
