This study investigates the effectiveness of High-Performance Fiber-Reinforced Cementitious Composites(HPFRCC) strengthening in enhancing the punching shear resistance of slab–column flat plate structures. A 3D nonlinear finite element model was dev...
This study investigates the effectiveness of High-Performance Fiber-Reinforced Cementitious Composites(HPFRCC) strengthening in enhancing the punching shear resistance of slab–column flat plate structures. A 3D nonlinear finite element model was developed based on existing test data, and material properties from HPFRCC direct tensile tests were incorporated. A total of 24 numerical models were analyzed considering strengthening method, range, depth, and reinforcement arrangement.
Results show that HPFRCC strengthening significantly improves ultimate load, deformation capacity, and energy dissipation. Layer-type strengthening was the most effective, while puddling strengthening showed gradual improvement with increasing area. Strengthening in the tension zone was more influential than increasing depth. Banded reinforcement improved strength and stiffness but reduced ductility.
Comparison with existing design codes revealed that they do not adequately capture the behavior of HPFRCC-strengthened slabs. An improved punching shear evaluation equation based on KDS 14 20 is proposed, incorporating material performance, reinforcement ratio, and critical perimeter, and demonstrated higher accuracy and consistency.
This study provides quantitative insights into key strengthening parameters and presents an improved evaluation method that enhances the practical applicability of HPFRCC punching shear reinforcement in flat plate structures.