scope:

This document defines requirements for a certain type of special hybrid moment frame composed of precast concrete beams jointed at their connections to columns that are continuous past those joints. While these frames do not satisfy all of the prescriptive requirements of Sections 21.3 through 21.5 of ACI 318, analyses and tests and reporting requirements in accordance with ACI T1.1-01 have established dependable and predictable strength, energy dissipation, stiffness, and drift capacities for characteristic beam-column configurations of the frames described in this document.

The requirements described in this document are for special hybrid moment frames with:

1. Equal moment strength for the top and bottom energy dissipating bars (special reinforcement) that cross the interface between the precast beam and column; and

2. Post-tensioning tendons that are unbonded from anchor to anchor and concentrically located within the cross section of the beam.

All precast and reinforced concrete components and systems for the moment frames, and the associated gravity load frames, shall be designed to satisfy the requirements of ACI 318 except as modified by this document.

The special inspection requirements of Section 1.3.5 of ACI 318 shall be satisfied for all precast and reinforced concrete components and systems for the special moment frames.