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Article

Finite Element Analysis of Vertical Bearing Performance in RC Slab–Column Joints: Effects of Bottom Reinforcement and Concealed Beams

1
School of Civil Engineering and Architecture, Nanchang University, Nanchang 330031, China
2
Design and Research Institute, Nanchang University, Nanchang 330047, China
*
Authors to whom correspondence should be addressed.
Buildings 2025, 15(16), 2905; https://doi.org/10.3390/buildings15162905 (registering DOI)
Submission received: 22 July 2025 / Revised: 9 August 2025 / Accepted: 14 August 2025 / Published: 16 August 2025
(This article belongs to the Special Issue Seismic and Durability Performance of Steel Connections)

Abstract

The vertical load-bearing performance of slab–column joints is significantly affected by bottom reinforcement and concealed beams, but existing studies remain insufficient in analyzing their influence mechanisms. To address this, the effects of bottom reinforcement, concealed beam width, and punch-to-span ratio on the mechanical properties of joints are systematically investigated in this study through finite element analysis. Validating 2 experimental models and establishing 13 parametric models, the results shows that adding bottom reinforcement can enhance the late-stage bearing capacity and ductility of joints; increasing the ratio of top-to-bottom reinforcement improves bearing capacity but reduces ductility; a wider concealed beam leads to better bearing capacity and ductility performance of the joint; and under the same concealed beam width, a larger punching–span ratio reduces bearing capacity but improves ductility. This study reveals the critical role of bottom reinforcement and concealed beams in joint performance, providing a theoretical basis for optimizing design.
Keywords: slab–column joint; vertical load-bearing performance; bottom reinforcement; concealed beam; punch-to-span ratio slab–column joint; vertical load-bearing performance; bottom reinforcement; concealed beam; punch-to-span ratio

Share and Cite

MDPI and ACS Style

Wei, X.; Cai, G.; Ke, N.; Liu, Y.; Wu, G.; Jia, Y. Finite Element Analysis of Vertical Bearing Performance in RC Slab–Column Joints: Effects of Bottom Reinforcement and Concealed Beams. Buildings 2025, 15, 2905. https://doi.org/10.3390/buildings15162905

AMA Style

Wei X, Cai G, Ke N, Liu Y, Wu G, Jia Y. Finite Element Analysis of Vertical Bearing Performance in RC Slab–Column Joints: Effects of Bottom Reinforcement and Concealed Beams. Buildings. 2025; 15(16):2905. https://doi.org/10.3390/buildings15162905

Chicago/Turabian Style

Wei, Xianglan, Gaowang Cai, Naiwen Ke, Yuanwen Liu, Guangyu Wu, and Yigang Jia. 2025. "Finite Element Analysis of Vertical Bearing Performance in RC Slab–Column Joints: Effects of Bottom Reinforcement and Concealed Beams" Buildings 15, no. 16: 2905. https://doi.org/10.3390/buildings15162905

APA Style

Wei, X., Cai, G., Ke, N., Liu, Y., Wu, G., & Jia, Y. (2025). Finite Element Analysis of Vertical Bearing Performance in RC Slab–Column Joints: Effects of Bottom Reinforcement and Concealed Beams. Buildings, 15(16), 2905. https://doi.org/10.3390/buildings15162905

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