1. Reinforced Concrete Design II
Lecture 9
Dr. Nader Okasha

2. Biaxial Bending

3. Biaxial bending in columns

4. Biaxial bending in columns

5. Biaxial bending in columns

6. Biaxial bending in columns

7. Biaxial bending in columns

8. Biaxial bending in columns

9. Biaxial bending in columns

10. Biaxial bending in columns
The Bresler Equation

11. Biaxial bending in columns
Interaction diagrams for biaxial bending

12. Biaxial bending in columns
Design Procedure for biaxial bending:
A- Determine reinforcement based on the biaxial bending capacity:
1- Determine the dimensions based on a reasonable stress in the column.
2- Determine g in the week axis direction (any direction for square sections.
3- Calculate the biaxial bending moment in the week axis direction.
4- Use an interaction diagram to design the reinforcement for the section.
B- Use the Bresler equation to check the axial capacity of the section
1- Calculate Pnx from the interaction diagram assuming only Mnx is applied.
2- Calculate Pny from the interaction diagram assuming only Mny is applied.
3- Calculate P0.
4- Calculate Pn and check

13. Biaxial bending in columns

14. Biaxial bending in columns

15. Biaxial bending in columns

16. Biaxial bending in columns

17. Biaxial bending in columns

18. Biaxial bending in columns

19. Biaxial bending in columns