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Questions and Answers
What is the primary difference between prestressed concrete and conventional reinforced concrete?
What is the primary difference between prestressed concrete and conventional reinforced concrete?
- Prestressed concrete has an initial load applied before use. (correct)
- Prestressed concrete contains more steel reinforcement.
- Conventional concrete is primarily used in high-rise buildings.
- Prestressed concrete uses higher grades of concrete.
Why is prestressed concrete less likely to sustain cracking in the tensile region?
Why is prestressed concrete less likely to sustain cracking in the tensile region?
- It has increased weight compared to ordinary concrete.
- High strength steel is used exclusively.
- It has a higher flexural capacity.
- It effectively manages tensile stresses through pre-compression. (correct)
What problem in conventional concrete does prestressing address effectively?
What problem in conventional concrete does prestressing address effectively?
- Low resistance to shear forces.
- High weight and volume requirements.
- Insufficient load-bearing capacity.
- Excessive deflection due to cracking. (correct)
What is a benefit of using high strength steel in prestressed concrete?
What is a benefit of using high strength steel in prestressed concrete?
What effect does pre-stressing have on the stiffness of concrete after cracking?
What effect does pre-stressing have on the stiffness of concrete after cracking?
What characteristic of prestressed concrete improves its shear capacity?
What characteristic of prestressed concrete improves its shear capacity?
Which of the following is NOT an objective of prestressing concrete?
Which of the following is NOT an objective of prestressing concrete?
What major issue does excessive cracking in concrete lead to?
What major issue does excessive cracking in concrete lead to?
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Study Notes
Introduction to Prestressed Concrete Design
- Prestressed concrete structures apply an initial load before use, distinguishing them from conventional reinforced concrete.
- The technique aims to combat the inherent weakness of concrete in tension, addressing issues like cracking and excessive deflection.
Challenges in Conventional Concrete
- Conventional concrete experiences tensile cracking, leading to reduced stiffness and potential durability problems.
- High-strength steel is often underutilized in standard reinforced concrete applications.
Benefits of Prestressing
- Prestressing introduces pre-compression, which significantly increases the load required for cracking, enhancing overall strength and stiffness.
- It allows for better control or elimination of tensile stresses, reducing the risk of cracking under service load levels.
Performance Enhancements
- Helps to control deflection at predetermined load levels, ensuring structural integrity.
- Facilitates the effective use of high-strength steel and high-strength concrete, optimizing material benefits.
Shear and Flexural Capacity
- Prestressed concrete exhibits higher shear capacity than conventional reinforced concrete.
- This method can also improve flexural capacity in columns, particularly in typical design regions.
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