1810.6 Concrete-Filled Steel Pipe and Tube Piles

Concrete-filled steel pipe and tube piles shall conform to the requirements of Sections 1810.6.1 through 1810.6.5.

Steel pipe and tube sections used for piles shall conform to ASTM A 252 or ASTM A 283. Concrete shall conform to Section 1810.1.1. The maximum coarse aggregate size shall be ³/₄ inch (19.1 mm).

For allowable stresses, see Table 1808.8.

Piles shall have a nominal outside diameter of not less than 8 inches (203 mm) and a minimum wall thickness in accordance with Section 1809.3.4. For mandrel-driven pipe piles, the minimum wall thickness shall be ¹/₁₀ inch (2.5 mm).

Reinforcement steel shall conform to Section 1810.1.2. For minimum concrete cover requirements see Table 1808.2.13.

Where a structure is assigned to Seismic Design Category C or D in accordance with Section 1613, minimum reinforcement no less than 0.01 times the cross-sectional area of the pile concrete shall be provided in the top of the pile with an embedment length equal to two times the required cap embedment anchorage into the pile cap, but not less than the tension development length of the reinforcement. The wall thickness of the steel pipe shall not be less than ³/₁₆ inch (5 mm).

The placement of concrete shall conform to Section 1810.1.3.