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.