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1810.3.2.7 Increased Allowable Compressive Stress for Cased Mandrell-Driven Cast-In-Place Elements
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The allowable compressive stress in the concrete shall be permitted to be increased as specified in Table 1810.3.2.6 for those portions of permanently cased cast-in-place elements that satisfy all of the following conditions:
- The design shall not use the casing to resist any portion of the axial load imposed.
- The casing shall have a sealed tip and be mandrel driven.
- The thickness of the casing shall be not less than manufacturer's standard gage No.14 (0.068 inch) (1.75 mm).
- The casing shall be seamless or provided with seams of strength equal to the basic material and be of a configuration that will provide confinement to the cast-in-place concrete.
- The ratio of steel yield strength (Fy) to specified compressive strength (f 'c) shall be not less than six.
- The nominal diameter of the element shall not be greater than 16 inches (406 mm).
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