Research Information System
Journal of Building Engineering, vol.101, 2025 (SCI-Expanded)
Beam-column joints undergo substantial shear stresses and deformations during strong ground motions, significantly influencing overall structural response and integrity. Therefore, accurate prediction of joint behavior is essential to ensure structural safety. Although the seismic behavior of reinforced concrete joints has been extensively investigated, there is only limited information on modeling the behavior of fiber reinforced concrete joints. In this study, a shear stress-distortion model that can be integrated into nonlinear analysis is developed for fiber reinforced concrete beam-column joints. First, a comprehensive database of experimental studies that provide shear stress-distortion relationships is compiled, considering key parameters influencing seismic behavior. The shear stress-distortion relationship is then idealized based on five performance points: cracking point, onset of significant inelastic activity, start and end points of the plateau corresponding to joint shear strength, and a final point at the end of the descending portion representing ultimate deformation capacity. Parameters demonstrating considerable correlations with the response are identified through Pearson Correlation Analyses, and a joint shear behavior model is formulated using linear and nonlinear regression analyses at each performance point. The accuracy of the model is verified through comparison with experimental results, which confirmed the effectiveness of the model in capturing the joint shear stress-distortion relationship. The developed model can be utilized for inelastic modeling of fiber reinforced concrete joints built with different fiber types, rather than assuming rigid joints for nonlinear analysis.