The limiting values of the neutral axis and moment of resistance depend on the type of steel used in reinforced concrete design. Here's a summary for mild steel, Fe415, and Fe500:
1. Mild Steel (Fe250)
- Limiting Neutral Axis Depth (xu,lim):
- Limiting Moment of Resistance (Mu,lim):where is the characteristic compressive strength of concrete, is the width of the beam, and is the effective depth.
2. Fe415 Steel
- Limiting Neutral Axis Depth (xu,lim):
- Limiting Moment of Resistance (Mu,lim):
3. Fe500 Steel
- Limiting Neutral Axis Depth (xu,lim):
- Limiting Moment of Resistance (Mu,lim):
These expressions are derived from the limit state design principles in reinforced concrete, accounting for the yield stress of the steel and the behavior of concrete in compression.
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