American Society of Civil Engineers


Behavior of Roof Deck Diaphragms under Quasistatic Cyclic Loading


by Hesham S. Essa, (Post-Doctoral Res. Assoc., Dept. of Civ., Geological, and Mining Engrg., Ecole Polytechnique, Montreal PQ, Canada H3C 3A7), Robert Tremblay, (Prof., Dept. of Civ., Geological, and Mining Engrg., Ecole Polytechnique, Montreal PQ, Canada H3C 3A7), and Colin A. Rogers, (Asst. Prof., Dept. of Civ. Engrg. and Appl. Mech., McGill Univ., MOntreal PQ, Canada H3A 2K6)

Journal of Structural Engineering, Vol. 129, No. 12, December 2003, pp. 1658-1666, (doi:  http://dx.doi.org/10.1061/(ASCE)0733-9445(2003)129:12(1658))

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Document type: Journal Paper
Abstract: A series of 18 large-scale tests was carried out on corrugated cold-formed steel deck diaphragms for single-story buildings to investigate the diaphragm’s ability to function as the main source for absorbing earthquake induced energy through inelastic behavior. Tests were performed using a cantilever type configuration for the test setup, in which the steel deck was laid in a horizontal plane. Diaphragm assemblies made with 0.76 and 0.91 mm thick metal deck sheets and with nine combinations of deck-to-frame and deck-to-deck (side lap) fasteners were tested. For each fastening combination, two tests were conducted: monotonic and quasistatic cyclic. Both the strength and failure modes under quasistatic cyclic loading are different from those under monotonic loading. Test results indicate that diaphragms with welded deck-to-frame fasteners without washers have limited ductility and cannot sustain cyclic loading at relatively large displacement amplitudes. The use of mechanical and welded-with-washer deck-to-frame fasteners enhances the strength, ductility and energy dissipation characteristics of the diaphragm considerably.


ASCE Subject Headings:
Cyclic loads
Decks
Fastening
Inelasticity
Nails
Seismic effects