Seismic Design of Reinforced Concrete Special Moment Frames; A Guide for Practicing Engineers, GCR 8-917-1









1. Introduction

Reinforced concrete special moment frames are used as part of

seismic force-resisting systems in buildings that are designed

to resist earthquakes. Beams, columns, and beam-column joints

in moment frames are proportioned and detailed to resist

flexural, axial, and shearing actions that result as a building

sways through multiple displacement cycles during strong

earthquake ground shaking. Special proportioning and

detailing requirements result in a frame capable of resisting

strong earthquake shaking without significant loss of stiffness

or strength. These moment-resisting frames are called “Special

Moment Frames” because of these additional requirements,

which improve the seismic resistance in comparison with less

stringently detailed Intermediate and Ordinary Moment Frames.


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