| Title |
Numerical study on the mechanical behavior of semi-rigid beam-to-column end-plate connections after fire |
| Authors |
곽습(Guo, Yi) ; 배창준(Bae, Chang-Jun) ; 김태수(Kim, Tae-Soo) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.5.345 |
| Keywords |
Beam to Column; Endplate Connection; Welded Structural Rolled Steel; Post Fire Behavior; Finite Element Analysis |
| Abstract |
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℃, 600℃, and 800℃ 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. |