Reinforced Concrete Design
,Compressive Strength of Concrete
• fcr is the average cylinder strength
• f’c compressive strength for design
• f’c ~2500 psi - 18,000 psi, typically 3000 - 6000 psi
• Ec estimated as: Ec 33w1.5 f ' c
where w = weight of concrete, lb/ft3
f’c in psi
E in psi
for normal weight concrete ~145 lb/ft3
Ec 57,000 f ' c
, Concrete Stress-Strain Curve
For short term loading. Over time concrete will creep and shrink.
,Compressive Strength of Concrete
• fcr is the average cylinder strength
• f’c compressive strength for design
• f’c ~2500 psi - 18,000 psi, typically 3000 - 6000 psi
• Ec estimated as: Ec 33w1.5 f ' c
where w = weight of concrete, lb/ft3
f’c in psi
E in psi
for normal weight concrete ~145 lb/ft3
Ec 57,000 f ' c
, Concrete Stress-Strain Curve
For short term loading. Over time concrete will creep and shrink.
