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1810.1.2.1 Design Cracking Moment
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The design cracking moment (φMn) for a cast-in-place deep foundation element not enclosed by a structural steel pipe or tube shall be determined using the following equation:
|f 'c||=||Specified compressive strength of concrete or grout, psi|
|Sm||=||Elastic section modulus, neglecting reinforcement and casing, cubic inches|
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