ABSTRACT The substation framework exhibits a relatively large thermal expansion coefficient and undergoes considerable deformation under elevated temperatures; this deformation may result in localised structural failures, potentially triggering the collapse of the entire system. In this study, ABAQUS software was employed to simulate three distinct fire conditions based on the standard heating curve; the displacement characteristics, deformation curves and deflection changes of the steel pipe herringbone column substation frameworks were analysed and the performance characteristics of the substation framework with and without fire‐resistant coating were compared. The research results indicate that: Under the static force, the location of the maximum displacement occurs at the connection points between the two central web elements and the chord, measuring 0.01033 m. The bare steel truss components subjected to high temperatures experience significant deformation, with displacement surpassing 100 mm, potentially leading to brittle failure of the steel. In contrast, when fire‐resistant coating is applied, structural deformation is considerably mitigated, limiting displacement to within 20 mm. The maximum deflection observed in bare steel structures exceeds the regulatory threshold of 70 mm. However, with the application of fire‐resistant coating, the entire steel structure remains in an upward expansion stage and the resulting deflection remains under 20 mm.
Zhu et al. (Thu,) studied this question.