scope:

This standard defines design requirements for a certain class of unbonded post-tensioned precast concrete shear walls that can be used as special reinforced concrete shear walls for Bearing Wall and Building Frame Special Reinforced Concrete Shear Wall Systems, as defined in ASCE/SEI 7.

The requirements described in this standard are for special unbonded post-tensioned precast shear walls with:

1. Essentially planar proportions in the vertical direction, no significant discontinuities in plan, in vertical configuration, or in their lateral-force-resisting system, and designed to have a single critical section for flexure and axial loads at the base of the shear wall;

2. Post-tensioning tendons unbonded from anchor to anchor and located in a single duct at the centroid of the transverse cross section of the wall, or in an additional two or more ducts positioned symmetrically on either side of that centroid and within 10% of the shear wall length from that centroid; and

3. Energy dissipation provided: a) for uncoupled walls by energy-dissipating reinforcement that crosses the interface between the base of the wall and the foundation; and b) for coupled walls by coupling devices that connect adjacent vertical boundaries of shear walls, number at least two for each connected vertical boundary of each precast panel, and are distributed uniformly over the height of the panel.