In this paper, a series of experimental and numerical studies are conducted to investigate the damage mechanism of thick fireproof coatings for steel members subjected to monotonic loadings, such as in tension, in compression or in bending. Firstly tests on members covered with thick fireproof coatings were brief introduced. Then, employing SOLID65 and CZM (Cohesive Zone Model) based on CONTA173, members under monotonic loadings were simulated with ANSYS, and, the stress distribution has been analyzed. From the experimental and numerical studies, the coating's damage mechanism has been revealed. For the case of tensile loading and bending loading (on tension side), normal debond-ing occurs at the ends of the interface followed by the transverse tensile crack in the coating. For both cases of compressive loading and bending loading (on compression side) damage begins with tangential debonding at the ends of the interface. But the failure modes are different. For the case of axial compressive loading, the failure mode is the peeling off of the whole coatings. While for the case of bending loading on compression side, the failure mode is the bending fracture occurred in the coating due to large curvature.
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