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Prestressed Concrete Structures: Advantages and Principles

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Prestressed Concrete Structures: Advantages and Principles

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Questions and Answers

What are the advantages of using prestressed concrete?

Enhanced susceptibility to corrosion

Improved crack resistance and durability (correct)

Increased construction cost

Decreased structural strength

What is the difference between pre-tensioning and post-tensioning in prestressed concrete?

The method of applying the tendon (correct)

The type of concrete used

The construction schedule

The structural design codes

Why is high strength concrete and high tensile steel necessary in prestressed concrete?

To increase construction time

To increase structural efficiency (correct)

To decrease structural stability

To minimize material costs

What are the forces considered in the calculation of deflection of prestressed concrete beams?

Live and dead loads Signup and view all the answers

What is meant by unpropped construction in prestressed concrete?

Construction without formwork support Signup and view all the answers

Distinguish between creep and shrinkage of concrete in the context of prestressed members?

Creep is caused by drying, while shrinkage is caused by sustained load Signup and view all the answers

What is the main purpose of prestressed concrete?

To reduce the deflection and cracking of concrete Signup and view all the answers

Which type of tendon is used in the prestressed concrete beam with an eccentricity of 100 mm below the centroidal axis?

Bent tendon Signup and view all the answers

What is the span of the simply supported post-tensioned concrete beam?

18m Signup and view all the answers

What is the permissible tensile stress in steel for the I-section design?

125 N/mm2 Signup and view all the answers

What does the parabolic cable do in the prestressed concrete beam?

Provides initial prestressing force Signup and view all the answers

What is the ultimate flexural strength of the unbounded tee section?

$2500 N/mm2$ Signup and view all the answers

How is the pre-tensioned beam affected by the 12 wires initially stressed to 1200 N/mm2?

Decrease in deflection due to reduced stress loss Signup and view all the answers

What does creep coefficient influence in the long-term deflection calculation?

Residual shrinkage strain Signup and view all the answers