| Reinforcement Location |
Steel provided only in the tension zone |
Steel provided in both tension and compression zones |
| Compression Zone Role |
Compression handled by concrete |
Compression handled by concrete and compression steel |
| Compression Steel Purpose |
Acts as dummy bars to hold stirrups |
Actively resists compressive stresses |
| Moment Resistance Capacity |
Designed to resist up to Rbd² |
Designed to resist greater than Rbd² |
| Usage Conditions |
Used when section dimensions are sufficient for required moment |
Used when section size is restricted or moment demand is high |
| Structural Behavior |
Limited rotation and deflection control |
Enhanced rotation capacity and reduced long-term deflection |
| Seismic Suitability |
Less flexible under seismic loads |
More flexible and preferred in earthquake-prone areas |
| Economy |
Economical for basic applications |
More economical for complex or constrained designs |