This chapter discusses the design of columns in reinforced concrete structures. It begins with an introduction to columns, their types according to shape, material, lateral reinforcement, bracing, and buckling behavior. The chapter then covers braced and unbraced columns, buckling in columns, notes on column dimensions and reinforcement, and the design of short and long columns. It concludes with examples of problems for the design of rectangular, T-section, and braced columns.

1. CHAPTER 12: COLUMNS

2. CONTENTS
Introduction to columns
Types of columns
Braced & Unbraced columns
Buckling in columns
Notes on columns
Design of short columns
Eccentric loading on sections
Design of long columns
Chapter 12 Problems

3. INTRODUCTION TO COLUMNS
Definition
Function
Dimensions

4. TYPES OF COLUMNS
According to shape

5. TYPES OF COLUMNS
According to material

6. TYPES OF COLUMNS
According lateral RFT

7. TYPES OF COLUMNS
According to side
bracing

8. TYPES OF COLUMNS
According to buckling

9. BRACED & UNBRACED COLUMNS
Bracing conditions

10. BRACED & UNBRACED COLUMNS
Bracing conditions

11. BUCKLING IN COLUMNS
Slenderness ratio

12. BUCKLING IN COLUMNS
Crushing & buckling
failure

13. BUCKLING IN COLUMNS
Crushing & buckling
failure

14. NOTES ON COLUMNS
Columns Dimensions

15. NOTES ON COLUMNS
Reinforcement Ratios

16. NOTES ON COLUMNS
Details of RFT

17. NOTES ON COLUMNS
Details of RFT

18. NOTES ON COLUMNS
Stirrups

19. NOTES ON COLUMNS
Stirrups

20. DESIGN OF SHORT COLUMNS
Working Stress Method

21. DESIGN OF SHORT COLUMNS
Ultimate Strength Method

22. ECCENTRIC LOADING ON SECTIONS
N = Compression

23. ECCENTRIC LOADING ON SECTIONS
N = Compression
(Big eccentricity)

24. ECCENTRIC LOADING ON SECTIONS
N = Compression
(Small eccentricity)

25. ECCENTRIC LOADING ON SECTIONS
N = Compression
(Small eccentricity)

26. ECCENTRIC LOADING ON SECTIONS
N = Tension

27. ECCENTRIC LOADING ON SECTIONS
N = Tension
(Big eccentricity)

28. ECCENTRIC LOADING ON SECTIONS
N = Tension
(Small eccentricity)

29. DESIGN OF LONG COLUMNS
Buckling effect

30. DESIGN OF LONG COLUMNS
Design Moments
(Braced)

31. DESIGN OF LONG COLUMNS
Design Moments
(Unbraced)

32. CHAPTER 12 PROBLEMS
1- Design a rectangular column subjected to working load = 300 ton.
Use Fcu = 250 Kg/cm2, Fy = 3600 Kg/cm2
by both working & ultimate methods.
2- Design the T-section shown in figure if it is subjected to
ultimate loads M=450 KN.m, N(Comp.) = 600 KN.
Use Fcu=25 N/mm2, Fy =360 N/mm2.
3- Design a braced column of 4.5 m height to resist an ultimate
load of 220 ton and bending moments about the secondary axes
of 10 and – 5 m.t. The column is partly fixes at both ends.
Use Fcu=250 Kg/cm2, Fy =3600 Kg/cm2.

33. REFERENCES
Design of R.C. Structures, Eng. Ahmed Gamal Abdel Gawad.
Lectures in Reinforced Concrete, Eng. Yasser Elleathy.
Design of Reinforced concrete, Dr. Magdy A. Tayel.
Design of Reinforced Concrete Structure II, D. Mashhour A. Ghoneim.
Reinforced Concrete, Dr. Nasr Younis.