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1. Moment of resistance of rectangular beam. By N amuna M ajhi

2. Moment of Resistance Introduction When a body is strained it tries to resist by generating internal stresses. Stress is the resistance offered by a body to an external force . when a beam bends the concave face of the beam is under compression and the convex face is under tension. These compressive and tensile strains produce compressive and tensile stresses (resistance) in the beam respectively. The couple formed by these resistive force is termed as a moment of resistance . .The moment of resistance depends on the material properties and the geometric characteristics of the beam

3. Ultimate moment of resistance If we consider the compressive and tensile stress of the beam to be equal to the tensile and compressive strength of the material then the couple formed by them is termed as ultimate moment of resistance or the ultimate bending moment since the beam cannot take bending moment more than that.

4. figure

5. Moment of resistance Balanced section Under reinforced section Over reinforced section

6. Balanced section Stress in concrete and steel reaches their permissible value at the same time. Percentage of steel corresponding to this section is called balanced section. Neutral axis is called as critical neutral axis Both the material will fail at the same time due to same permissible value .

7. Under reinforced section Percentage of steel is less than that of provided in balanced section. A ctual neutral axis will shift upward i.e n< nc . The permissible strength of steel is less as compared to concrete. The failure of steel takes place first than that of concrete. Ductile or under reinforced failure.

8. Over reinforced section Percentage of steel provided is greater than the balanced section. Actual neutral axis shift downward i.e n> nc . Permissible strength of steel is much more as compared to concrete. Failure of concrete takes place first which is brittle in nature .

9. Balanced, under, over reinforced section.

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