18.6 Beams of Special Moment Frames
(a) Within the joints
(c) Within a distance of twice the beam depth from critical sections where flexural yielding is likely to occur as a result of lateral displacements beyond the elastic range of behavior
(a) The average prestress fpc calculated for an area equal to the least cross-sectional dimension of the beam multiplied by the perpendicular cross-sectional dimension shall not exceed the lesser of 500 psi and fc'/10.
(c) Prestressing steel shall not contribute more than one-fourth of the positive or negative flexural strength at the critical section in a plastic hinge region and shall be anchored at or beyond the exterior face of the joint.
(d) Anchorages of post-tensioning tendons resisting earthquake-induced forces shall be capable of allowing tendons to withstand 50 cycles of loading, with prestressed reinforcement forces bounded by 40 and 85 percent of the specified tensile strength of the prestressing steel.
(b) Over lengths equal to twice the beam depth on both sides of a section where flexural yielding is likely to occur as a result of lateral displacements beyond the elastic range of behavior.
(c) 6 in.
(a) The earthquake-induced shear force calculated in accordance with 184.108.40.206 represents at least one-half of the maximum required shear strength within those lengths.
(b) The factored axial compressive force Pu including earthquake effects is less than Agf'c/20.