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Questions and Answers
What distinguishes a pre-stressed concrete structure from a conventional reinforced concrete structure?
What distinguishes a pre-stressed concrete structure from a conventional reinforced concrete structure?
- Use of lighter materials
- Reduction of load-bearing capacity
- Application of an initial load prior to use (correct)
- Increased thickness of concrete
What is a primary reason that cracking occurs in conventional concrete?
What is a primary reason that cracking occurs in conventional concrete?
- Improper mixing of materials
- Rapid temperature changes
- Concrete's weakness in tension (correct)
- Excessive weight on the structure
What effect does excessive cracking in concrete have on its properties?
What effect does excessive cracking in concrete have on its properties?
- Decreases durability (correct)
- Enhances flexibility
- Increases its tensile strength
- Improves load-bearing ability
How does pre-compression affect the load required to crack concrete?
How does pre-compression affect the load required to crack concrete?
What is one advantage of pre-stressed concrete in terms of shear capacity?
What is one advantage of pre-stressed concrete in terms of shear capacity?
What benefit does pre-stressing provide concerning deflection control?
What benefit does pre-stressing provide concerning deflection control?
What can excessive deflection in concrete structures indicate?
What can excessive deflection in concrete structures indicate?
Why is high strength steel used effectively in pre-stressed concrete?
Why is high strength steel used effectively in pre-stressed concrete?
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Study Notes
Prestressed Concrete Design
- Prestressed concrete is different from reinforced concrete because of the initial load applied prior to the structure's use.
Advantages of Prestressed Concrete
- Prestressed concrete structures are strong, tough, and stiff.
Disadvantages of Traditional Reinforced Concrete
- Cracking in tensile region, as concrete is weak in tension
- Excessive deflection as stiffness decreases due to cracking
- Excessive cracking can create durability problems
- High strength steel not effectively used
Benefits of Prestressed Concrete
- Control or eliminate tensile stresses in the concrete (cracking) at least up to service load levels.
- Control or eliminate deflection at some specific load level.
- Allow the use of high strength steel and concrete.
- Prestressed concrete has higher shear capacity than ordinary reinforced concrete.
- Prestressed concrete improves the flexural capacity in columns.
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