where c = distance from the point at which the crack. width is to be deter-
mined to the surface of the nearest reinforcement bar f, = stress in the
steel, E, = modulus of elasticity of thetsteel, 412 == distance from thepoint
at which the crack width is to be determined to the neutral axis, and h1 =
distance from the centroid of the tension steel to the neutral axis. Some of the
notation appears in Fig. 10.20a