SINGLY REINFORCED SECTION. INTERNAL FORCES IN EQUILIBRIUM.

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Presentation transcript:

SINGLY REINFORCED SECTION

INTERNAL FORCES IN EQUILIBRIUM

MOMENT OF RESISTANCE WITH RESPECT TO STEEL MOMENT OF RESISTANCE WITH RESPECT TO CONCRETE

In design, EC2 limits x to not exceeding 0.45d in order to avoid the sudden failure exhibited by an over-reinforced section. When x = x bal = 0.45d, M represents ultimate moment of resistance of singly reinforced section or balanced moment, M bal ULTIMATE MOMENT OF RESISTANCE OF SINGLY REINFORCED SECTION

EXAMPLE 2.1

SOLUTION

EXERCISE 2.1

EXAMPLE 2.2

DOUBLY REINFORCED SECTION

INTERNAL FORCES INTERNAL FORCES IN EQUILIBRIUM

LEVER ARM MOMENT OF THE TENSION STEEL

FOR DESIGN PURPOSE, X = 0.45d AREA OF COMPRESSION REINFORCEMENT

MULTIPLYING EQN 2.5 BY z

AREA OF TENSION REINFORCEMENT

DESIGN PROCEDURE FOR RECTANGULAR SECTION

EXAMPLE 2.3

EXAMPLE 2.4

EXAMPLE 2.5