| 摘要 |
PROBLEM TO BE SOLVED: To reduce a sectional area of a column while securing fire-resistance performance and effectively preventing generation of a crack.SOLUTION: A composite column 1 comprises: a column central portion 2 which is made of high-strength concrete having a predetermined water cementitious material ratio as well as predetermined strength and is arranged in a central portion of a column section; and a column peripheral portion 3 which is made of concrete having lower water cementitious material ratio as well as strength than the high-strength concrete and is arranged at a peripheral portion of the column section in a manner that covers whole side faces of the column central portion 2. In the composite column 1, column main reinforcement 4 is arranged only in the column peripheral portion 3. |
