Effect of earthquake-induced damage to spray-applied fire-resistive insulation on the response of steel moment-frame beam-column connections during fire exposure
Restricted accessResearch articleFirst published online November, 2012
Effect of earthquake-induced damage to spray-applied fire-resistive insulation on the response of steel moment-frame beam-column connections during fire exposure
Spray-applied fire-resistive material (SFRM) is prone to debonding, cracking, and spalling in steel moment-frame beam hinge regions during inelastic seismic response. This article presents an analytical case study designed to evaluate the effect of experimentally observed SFRM spall patterns on the thermomechanical response of a steel moment-frame beam-column assembly during post-earthquake compartment fire exposure. Earthquake-induced SFRM spalling is shown to significantly increase thermal degradation in the beam hinge region during fire exposure, leading to considerable temperature-induced softening of moment-rotation response for the beam-column assembly. This reduction in rotational stiffness increases the flexibility of the structural system for sideway motion, and exacerbates drift demands under the action of residual (post-earthquake) destabilizing forces.
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