Seismic behavior assessment of exterior steel fiber reinforced concrete beam-column connections utilizing nonlinear finite element analysis

Date

2026-01-01

Author

Fares, Anas M. H.
Burak Bakır, Burcu

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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This study examines the seismic performance of exterior beam-column connections constructed with steel fiber reinforced concrete (SFRC), utilizing advanced nonlinear finite element (FE) modeling. Six subassemblies with RC and SFRC connection regions are modeled in ABAQUS, and the numerical results are validated against experimental data to ensure accuracy in capturing essential response characteristics. Unlike simpler analytical models, the developed FE model effectively predicts the complete nonlinear behavior, including damage progression, post-peak softening, and ultimate displacement capacity, enabling an accurate estimation of the toughness and ductility. After validating the model, a comprehensive parametric study is conducted to assess the effects of fiber volume fraction, joint shear reinforcement, and column axial load ratio on the seismic behavior. It is observed that increasing the fiber volume fraction significantly enhances the seismic behavior by delaying joint shear failure and fostering ductile flexural behavior, and a minimum of 1.0% fiber volume fraction ensures the yielding of longitudinal beam bars prior to joint shear failure leading to a ductile behavior. These insights are crucial for enhancing joint design by reducing reinforcement congestion while maintaining structural performance, thereby promoting the adoption of SFRC as an effective solution in seismic applications.

Subject Keywords

Beam-column connections, Ductility, Finite element analysis, Steel fiber reinforced concrete (SFRC), Toughness

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105030134460&origin=inward
https://hdl.handle.net/11511/118615

Collections

Department of Civil Engineering, Article