| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight high-strength columnar structure.SOLUTION: A columnar structure includes: a multiple cylinder whose radial direction is a first direction; and a plurality of cylindrical structures formed in a space between an inner cylinder and an outer cylinder adjacent to each other in the multiple cylinder. An axial direction of each of the cylindrical structures is the first direction. A cross-sectional area of each of the cylindrical structures in a plane orthogonal to the first direction increases from the inner cylinder toward the outer cylinder. |
