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Prestressed concrete beams offer a solution to the limitations of reinforced concrete by allowing for longer spans and reduced cracking. By applying initial stresses to counteract the expected loads, this method enhances the durability and performance of concrete structures. The chapter explores materials, manufacturing techniques, and the mechanics involved in prestressing to achieve structural efficiency.
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26.pdfClass Notes
Memorization
What we have learnt
- Prestressed concrete allows...
- There are two types of pres...
- Proper stress management is...
Final Test
Revision Tests
What we have learnt
- Prestressed concrete allows for longer spans compared to traditional reinforced concrete.
- There are two types of prestressing: pretensioning and post-tensioning.
- Proper stress management is critical to prevent excessive losses in the prestressing steel.
Key Concepts
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Term: Prestressed Concrete (P/C)
Definition: Concrete that is intentionally subjected to stresses to counteract anticipated loads, improving its strength and durability.
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Term: Pretensioning
Definition: A method where the steel tendons are tensioned before the concrete is cast, allowing the concrete to bond to the stressed steel.
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Term: Posttensioning
Definition: A method where concrete is cured before steel tendons are tensioned, which are then used to compress the concrete.
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Term: Relaxation
Definition: The reduction in stress of a material under constant strain, particularly significant in prestressed steel over time.
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Term: Creep and Shrinkage
Definition: Deformations in concrete that occur over time, affecting the prestressing efficiency and slight changes in length.