open access

https://hdl.handle.net/2115/100465

Development of a Nonlinear Mechanical Model for Fiber Concrete-Enhanced Steel (FCES) Columns with Flexural-shear Failure Mode

英語

flexural-shear failure mode

2026-07-01

Proceedings of the 10th International Symposium on Reliability Engineering and Risk Management (ISRERM 2026)

The Fiber Concrete-Enhanced Steel (FCES) column is a composite column consisting only of a steel section and fiberreinforced concrete, without conventional reinforcement, thereby reducing construction complexity. Currently, ASCE 41 does not provide modeling parameters for FCES columns. In addition, the AIJ guidelines propose a mechanical model for FCES columns based on the assumption of a flexural failure mode. However, this model does not reflect the actual behavior observed in many experimentally tested FCES columns reported in previous studies, where the predominant failure mode is flexural-shear. The proposed model is modified from an existing Steel-Reinforced Concrete (SRC) model and is validated using 25 FCES column experimental datasets. The model is applicable to concrete compressive strengths ranging from 31.2 MPa to 65.3 MPa, Axial load ratios of 0.09-0.3, Fiber contents of 1-2%, XH-steel ratios of 5.64– 6.65%, and H-steel ratios of 3–7.01%. The considered fiber types include Hybrid fiber concrete (HyFC), Steel fiber concrete (SFC), and PVA fiber concrete (PVA-FC). The proposed model defines four key points—cracking, peak, stable post-peak, and ultimate—based on elastic analysis, P–M interaction, and modified deformation relationships. The results demonstrate conservative predictive performance.

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