Reinforced Concrete Design (RCD)
Quick Review Guide for Civil Engineering Students
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1. Introduction
Reinforced concrete combines concrete and steel to create a strong structural material. Concrete
resists compression while steel reinforcement provides tensile strength.
2. Material Properties
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Concrete is strong in compression but weak in tension.
Typical compressive strength (f'c): 21–35 MPa.
Steel reinforcement provides tensile strength and ductility.
Common yield strength (fy): 275 MPa or 415 MPa.
3. Design Methods
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Ultimate Strength Design (USD) uses factored loads and strength reduction factors.
Working Stress Design (WSD) is based on elastic behavior and service loads.
USD is the most commonly used method in modern structural design.
4. Flexural Design Basics
Nominal Moment Capacity Formula:
Mn = As × fy × (d − a/2)
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As = area of steel reinforcement
fy = yield strength of steel
d = effective depth
a = depth of equivalent stress block
Tension-controlled sections are preferred for safety.
5. Shear Design
Concrete shear capacity formula:
Vc = 0.17 √f'c × b × d
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Provide stirrups when required shear exceeds concrete capacity.
Shear failure is brittle and must be prevented.
Always check shear near supports.
6. Common Failure Modes
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Flexural failure – ductile and desirable.
Shear failure – sudden and brittle.
Bond failure – caused by insufficient development length.
7. Board Exam Tips
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Write all given values clearly.
Check units before solving.
Memorize common material strengths.
Practice beam and slab problems regularly.
Review NSCP load combinations and requirements.
8. Quick Review Questions
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Why is steel added to concrete?
What is the difference between USD and WSD?
Which type of beam failure is preferred?
When should shear reinforcement be provided?
What is development length?