Concrete & Steel Behavior

Concrete & Steel Summary:

Five Fundamental Properties of Reinforced Concrete (Nilson pg 19.)

• Reinforced Concrete behavior is based on stress and strain of
• Internal normal & shear stresses at any section of a member are in equilibrium with effects of external loads.
• Assume tensile strength is non-existent.
• Plane sections remain plane
• Assume perfect bond between steel and concrete.

We can categorize Stress-Strain Behavior of R/C concrete into 5 categories. 

• Uncracked section
• Incipient Cracking
• Cracked Section
• Yielding of Steel
• Ultimate Condition

Concrete Material Properties

Reinforced Concrete 1 Notes: Summary

• ACI 318-11 Eqs (9-1) Modulus of Rupture - Estimate of concrete's tensile strength. Used in calculating tensile fracture stress.
• Almost all calculations of concrete rely on compression strength (f'c). This is based on the strength of compression test at 28 days.