NOTES:

1. Pile weights are based on 158 pcf combined concrete/reinforcement unit weight.
2. Number of ½" diameter, 270 ksi, low relaxation, seven wire strands jacked to 0.75 f_pu = 202.5 ksi.
3. Effective precompression in the concrete after long term prestress losses.
4. P=A (0.33f'_c - 0.27f_pc) in accordance with References 1,2 and 3. The values derived from this equation , and reflected in the table above, are for concentrically loaded short columns. References 2 and 3 recommend the use of this equation for values of l /r less than 60, where l is the effective unsupported length of the pile, and r is the radius of gyration. In cases where l /r is greater than 60, or when piles are loaded under combinations of axial and moment, the interaction diagrams should be used in design.
5. Concrete cover over reinforcement = 2 in.
6. Allowable axial loads shown apply for conditions where the pile strength controls. Lower values may be dictated by the soil conditions.
7. These tables are intended as aids to preliminary sizing and must be interpreted on the basis of sound engineering judgement.
8. For additional information on specific applications, please contact Concrete Technology Corporation.