| Ab |
= |
area of individual wire to be developed or spliced, sq. in. (mm2) |
| As |
= |
area of nonprestressed tension reinforcement, sq. in./1 ft.(mm2/m) |
| d |
= |
distance from extreme compression fiber to centroid of tension reinforcement, in (mm)
|
| db |
= |
nominal diameter of bar, wire, or prestressing strand, in. (mm) |
| f'c |
= |
specified compressive strength of concrete, psi. (MPa) |
 |
= |
square root of specified compressive strength of concrete, psi. (MPa) |
| fs |
= |
calculated stress in reinforcement at service loads, psi. (MPa)
|
| fy |
= |
specified yield strength of nonprestressed reinforcement, psi (MPa)
|
| h |
= |
overall thickness of member, in (mm) |
| Ktr |
= |
transverse reinforcement index |
| ld |
= |
tdevelopment length, in. (mm)
|
| S |
= |
center to center spacing of reinforcement |
 |
= |
lightweight factor
|
 |
= |
location factor |
 |
= |
coating factor |
 |
= |
reinforcement size factor
|
*However  ≤ 1.7 |
