Journal
MATERIALS
Volume 14, Issue 14, Pages -Publisher
MDPI
DOI: 10.3390/ma14144016
Keywords
beam-column joints; steel fiber-reinforced high-strength concrete; finite element model; cyclic loading
Categories
Funding
- National Natural Science Foundation of China [51708514]
- Key Scientific Research Projects of Colleges and Universities of Henan Provincial Department of Education [21A560015]
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The present study numerically investigated the behavior of steel fiber-reinforced high-strength concrete beam-column joints under seismic action. It was found that increasing the concrete strength enhances the ultimate load, while adding steel fiber and increasing the stirrup ratio significantly improve the seismic performance of the joints.
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.
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