This paper presents an investigation into the influence of concrete panel thickness (CPT) on the post-fire behavior of composite steel plate shear walls (CSPSW). The concrete panel (CP) within the CSPSW serves a crucial role in augmenting the shear capacity of this lateral-resisting system by mitigating out-of-plane buckling of the steel plate. However, a fundamental inquiry arises: does this component contribute to enhancing the shear capacity of the steel plate (SP) by mitigating fire-induced damage? To address this question, a series of numerical CSPSW models at a scale of 1:3 were developed, featuring varying CPTs of 80, 100, 120, 150, and 200 mm, and subsequently subjected to cyclic loading following 2 hours of fire exposure. Fire simulations were conducted utilizing coupled temperature-displacement analysis, and subsequent to adjustments in mechanical properties due to fire exposure, the CSPSWs underwent cyclic quasi-static loading. The findings indicate that the CP effectively functions as a protective cover for the SP owing to the low thermal conductivity of concrete. Notably, an increase in CPT from 120 mm to 200 mm resulted in a significant enhancement of the final post-fire shear capacity, exhibiting a 48.70% increase.

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