Section 2219 High-Velocity Hurricane Zones—Tubular Columns

Tubular columns and other primary compression members, excluding secondary posts and struts not subject to bending and whose design load does not exceed 2,000 pounds (8900 N), shall have a minimum least dimension of 2¹/₂ inches (64 mm) and a minimum wall thickness of ³/₁₆ inch (4.8 mm).

Tubular members when filled with concrete shall have ¹/₄-inch diameter (6.4 mm) pressure relief holes drilled through the shell, within 6 inches (152 mm) of the top and bottom of the exposed length of the member and one hole at midheight.

Concrete fill in tubular members shall not be assumed to carry any of the load except in compression members having a least dimension of 8 inches (203 mm) or greater and having a 1 inch (25 mm) inspection hole in the plate at each end.