Damage investigation of cementitious fire resistive coatings under complex loading

摘要

Cementitious coatings are widely used to protect steel structures from fire, yet there are concerns about its performance in earthquakes, where partial damage to the fire protection could potentially compromise the fire safety of steel structures. In this paper, results from a series of experiments are presented to quantify the damage in cementitious fire resistive coatings under cyclic loading. Steel plates of various sizes are first tested under cyclic loading, which exhibit greater damage than the specimens subjected to monotonic loading. A steel column is subjected to cyclic load along with another subjected to monotonic load are both coated with 20 mm thick cementitious fire resistive material and tested to investigate the damage patterns in a more realistic setup than steel plates. Tensile transverse cracks on the flange, vertical cracks along the flange tip, and interfacial debonding of the coatings are the main forms of coating damage, which appear with a lower story drift ratio compared to the monotonically loaded column specimen. (C) 2018 Published by Elsevier Ltd.