Abstract
The present research study aims to investigate numerically the behavior of steel fiber-reinforced high-strength concrete (SFRHC) beam–column joints (BCJs) under seismic action. Based on the plastic damage constitutive model of concrete and elastic–plastic mixed-strengthen constitutive model of steel material, the finite element software ABAQUS was utilized to establish the 3D finite element (FE) model of BCJs. Additionally, the feasibility and accuracy of the numerical simulation were verified by comparing the computed results and experimental observations in terms of the hysteresis curves, skeleton curves, and failure mode. Furthermore, based on the validated FE modeling approach, load vs. displacement hysteresis curves of SFRHC–BCJs during the loading process were analyzed in detail; the failure process was also investigated. Furthermore, the effect of various parameters on the seismic behavior of BCJs was analyzed comprehensively, including the concrete strength, the volume ratio of steel fiber, and the stirrup ratio in the core area. Finally, parametric studies illustrated that increasing the concrete strength helps in enhancing the ultimate load, while the ductility decreased noticeably. Both adding the steel fiber and increasing the stirrup ratio can significantly improve the seismic performance of BCJs.
Highlights
Beam–column joints (BCJs) are the critical parts of the frame structure, and their failure can lead to the collapse of the whole structure
Compared with nonfiber concrete BCJs, the results show that high steel fiber content concrete BCJs have a higher ductility coefficient and stronger energy dissipation capacity
This study aims to explore the seismic behavior of BCJs
Summary
Beam–column joints (BCJs) are the critical parts of the frame structure, and their failure can lead to the collapse of the whole structure. Stipulates the dense arrangement of shear connections. This may lead to blockage of steel bars, resulting in difficulties in the concrete pouring and increasing construction costs [9,10,11]. This is an excellent method to add randomly distributed short fibers into the concrete matrix. Issa et al [12] and Zhu et al [13] obtained a higher ultimate compressive strain of concrete by adding steel fiber, improving ductility and flexural strength of fiber reinforced concrete beams. Horňáková [15] studied the effect of steel fiber on concrete electrical resistivity
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