Seismic response of steel frames containing hierarchical frictiondissipating joints

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Seismic response of steel frames containing hierarchical frictiondissipating joints

Author: J.W. Butterworth Department of Civil and Resource Engineering, The University of Auckland | Size: 0.2 MB | Format: PDF | Quality: Unspecified | Publisher: Mechanics of Structures and Materials, Bradford, Bridge & Foster (eds) © 1999 Balkema, Rotterdam, | Year: 1999 | pages: 6 | ISBN: ISBN 90 5809 107 4

Friction dissipating joints with slotted bolt holes have been used in concentrically
braced frames (linear sliding) and more recently, 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 decoupling 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, stiffer structures with high levels of ductility. Rotating sliding bolted
joints extend the benefits of damage-free energy dissipation to moment-resisting frames. The
decoupling of beam stiffness and end moment strength avoids over-sizing columns to deal with
beam over-strength moments. The performance of a rotational slotted 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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