| 摘要 |
PROBLEM TO BE SOLVED: To provide a reinforced concrete column which can prevent broken pieces form being scattered together with an explosion sound in crushing and increase a limit distortion angle (toughness), when a hollow outer-shell precast concrete member filled with filling concrete and constituting the reinforced concrete column is formed of ultrahigh-strength concrete. SOLUTION: This reinforced concrete column 1 is formed by arranging a main reinforcement 5 for the column inside the hollow outer-shell precast concrete member 2 in which a shear reinforcement 4 is embedded, and infilling the filling concrete 3. The hollow outer-shell precast concrete member is formed in such a manner that steel fibers with a fiber diameter of 0.1-1 mm and a fiber length of 60 mm or less are mixed into the ultrahigh-strength concrete with a compressive strength of 100 N/mm<SP>2</SP>or more at a mixing ratio which satisfies the following expression (1): R<SB>u</SB>(×10<SP>-3</SP>rad)=2.622×steel-fiber mixing ratio (vol.%)+24.525. In the expression (1), R<SB>u</SB>represents the limit distortion angle, and the steel-fiber mixing ratio (vol.%) is 2% or less. COPYRIGHT: (C)2009,JPO&INPIT
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