Thick fireproof coatings are widely adopted for their good fire resistance performance.Thick fireproof coatings would be easily damaged in loads such as earthquake and impact

which may leads to a considerable reduction of fire resistance.Hence

in this paper

a series of experiments were conducted to investigate the damage mode of thick fireproof coatings for steel plates under monotonic bending loading.The corresponding finite element models were established to analyze the whole process and compare with experiment results.The results show that for the case of bending loading（on compression side）

damage begins with shear debonding at the ends of the interface and the failure mode is the peeling off of the whole coatings.But on tension side

normal debonding occurs at the ends of the interface followed by the transverse tensile crack in the coating.And it is found that the thicker the coating is

the earlier the debonding at the interface occurs.The cracks in the interface and the coatings appear earlier when there is strain gauge installed on the coatings.