The Precast Hybrid Moment Frame is a unique system which limits damage and allows for quick and efficient construction. The moment frame combines the benefits of a self-righting mechanism from prestressing tendons and ductility from mild reinforcing steel, and emulates, if not exceeds the ductility of a cast-in-place reinforced concrete special moment resisting frame. The system was developed and tested in the early 1990s, but until now, there has been no consensus document for its design. The 1997 Uniform Building Code allowed the use of precast systems to resist lateral loads, provided that testing confirmed the ductility factors used in analysis and design. However, the code gave no specifics on the testing program or the design itself. The current adopted codes in California, the 2006 International Building Code and ACI 318-05, specify a testing program developed by the ACI Innovation Task Group 1 (ACI T1.1). The initiative also developed the first prescriptive design document for the Precast Hybrid Moment Frame (ACI T1.2). Implicit in the adopted building codes is the use of ACI T1.2 for Hybrid Frame design. For clarification, the design document is explicitly referenced in ACI 318-08. This paper discusses the implementation of this consensus design document for the Precast Hybrid Moment Frame.
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