Friction dissipating joints with slotted bolt holt holes have been used in concentrically braced frames (linear s liding) and more recnelty, in moment resisting frames (rotational sliding). Such joints have the ability to provide many cycles of ductile energy dissipation with little or no primary structural damage and permit the decojplikng of the strength and stiffness of connected members. Suggestions are offered on the use of linear sliding joints in K-braced frames where they could lead to cheaper, stiffere structures with high levels of ductility. Rotating sliding bolted joints extned the benefits of damage-free energy dissipation to moment-resisting frames. The deconpling of beam stiffness and end moment strength aviods over-sizing colums to deal with beam over-strength moments. The performnce of a rotational soltted joint having a hierarchy of two distinct moment levels at which limited rotational slip can occur is discussed. The basic characteristics of the joint are described and some observations made on the seismic response of some sample frames to seismic ground motion.
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