Design of Reinforced Concrete Structures CIE-334 Introduction Chapter 1

Design of Reinforced Concrete
Structures

CIE-334


Introduction
Chapter 1




Dr. Azhar Saleem
Jan. 10, 2022
1
Reference: Design of Concrete Structure by David Darwin, Charles Dolan and Arthur Nilson

,Design of Reinforced Concrete Structures
Concrete
Concrete is a mixture of cement, fine and coarse aggregate.
Concrete mainly consists of a binding material and filler material. If
filler material size is < 5mm it is fine aggregate and > 5mm is coarse
aggregate.
Plain Concrete (PC)
Mixture of cement , sand and coarse aggregate without any
reinforcement (Steel bars) is known as plain concrete.
PC is strong in compression and week in tension. Its tensile strength is
so small that it can be neglected in design.
Reinforced Concrete (RC)
Mixture of cement , sand and coarse aggregate with
reinforcement is known as RC. (Tensile strength is improved)
2

,Design of Reinforced Concrete Structures

Reinforced Concrete (RC) contd..
Mix Proportion
Cement : Sand : Crush (coarse aggregates)
1 : 1.5 : 3
1 : 2 : 4
1 : 4 : 8
Water Cement Ratio (W/C)
W/C = 0.5 to 0.6

For a mix proportion of 1:2:4 and W/C = 0.5, if cement is 50 kg
Sand = 2 x 50 = 100 Kg
Crush = 4 x 50 = 200 Kg Batching By Weight
Water = 50 x 0.5 = 25 Kg
3

, Design of Reinforced Concrete Structures


Mechanism of Load Transfer Load

Function of structure is Slab
to transfer all the loads
safely to ground. Beams
A particular structural
member transfers load Columns
to other structural
member. Foundation

Soil


4