화재 후 반강접 보-기둥 엔드플레이트 접합부의 역학적 거동에 관한 해석적 연구

초록

This study numerically investigates the post-fire structural behavior of beam–column connections, including end-plate semi-rigid connections (EP), end-plate connections with composite steel–concrete slabs (EPCS), and column tree connections (CT). The reliability of the finite element model was first validated based on previously reported experimental results. Subsequently, monotonic loading analyses were conducted under ambient conditions and after exposure to elevated temperatures of 400°C, 600°C, and 800°C followed by cooling. The analytical results indicate that both EP and EPCS connections exhibit significant reductions in residual strength and rotational stiffness with increasing temperature, whereas the EPCS connections show relatively superior residual performance due to the composite action of the concrete slab. The CT connections generally maintain stable structural behavior; however, in the high-temperature range, a transition in the failure mechanism is observed due to the degradation of bolt pretension. The findings of this study provide fundamental data for the performance evaluation and experimental design of steel beam–column connections after fire exposure.

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