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By Headquarters U.S. Army Corps of Engineers Engineering Division Directorate of Military Programs Washington

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Reinforcement steel should be full length for shafts constructed in expansive soil and for shafts requiring casing while the hole is excavated. Shaft diameter should be increased if the reinforcement steel required to resist bending such that adequate voids through the reinforcement cage will be provided to accommodate the maximum aggregate size of the concrete. (4) The maximum applied axial load should also include maximum downdrag forces for a shaft in compressible soil and the maximum uplift thrust for a shaft in expansive soil.

Chapter 4 discusses procedures for calculating the distribution of bending moments to determine where steel will be placed in the pile. (2) Load factors are applied to the design live and dead loads to ensure adequate safety against structural failure of the shaft. 25 for a shaft supporting a bridge column. (3) The minimum reinforcement steel, normally recommended, is 1 percent of the total cross-sectional area of drilled shaft expected to be exposed along their length by scour or excavation. Reinforcement steel should be full length for shafts constructed in expansive soil and for shafts requiring casing while the hole is excavated.

Shaft diameter should be increased if the reinforcement steel required to resist bending such that adequate voids through the reinforcement cage will be provided to accommodate the maximum aggregate size of the concrete. (4) The maximum applied axial load should also include maximum downdrag forces for a shaft in compressible soil and the maximum uplift thrust for a shaft in expansive soil. Uplift thrust may develop before the full structural load is applied to the shaft. Under such conditions, smaller amounts of reinforcement may be used if justified on the basis of relevant and appropriate computations.

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Design of Deep Foundations by Headquarters U.S. Army Corps of Engineers Engineering Division Directorate of Military Programs Washington


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