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.