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In the pre-tensioning method, which of the following statements are correct?
1) The tension in the concrete is induced directly by external force
2) Tension is induced in the tendons before concreting
3) Concrete continues to be in tension after pre-stressing
2) Tension is induced in the tendons before concreting
3) Concrete continues to be in tension after pre-stressing
- a)1 only
- b)2 only
- c)3 only
- d)1 and 3 only
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
In the pre-tensioning method, which of the following statements are co...
In pretension, tension is induced in the tendons before concreting.Once the concrete sets and hardens, tendons are cut and prestress is transferred to concrete. Hence after application of prestressing, concrete is in compression.
Most Upvoted Answer
In the pre-tensioning method, which of the following statements are co...
Statement: In the pre-tensioning method, tension is induced in the tendons before concreting.
Explanation:
In pre-tensioning method, the tendons are first tensioned before the concrete is placed. This is achieved by stretching the tendons using hydraulic jacks and anchoring them to the ends of the structure. Once the tendons are tensioned, the concrete is poured and allowed to harden around the tendons. This process creates a compressive force in the concrete and a corresponding tensile force in the tendons.
Advantages of Pre-tensioning:
1. Higher efficiency: Pre-tensioning allows for higher efficiency compared to post-tensioning as the tendons are tensioned before the concrete is poured. This results in a more efficient transfer of forces between the tendons and the concrete.
2. Increased load-carrying capacity: By pre-tensioning the tendons, the concrete is initially placed under compression. This increases its load-carrying capacity and allows for the construction of longer spans without the need for additional supports.
3. Reduced cracking: Pre-tensioning helps in reducing cracking in the concrete structure. The initial compressive force in the concrete helps to counteract the tensile stresses induced by external loads, thereby reducing the likelihood of cracking.
Comparison with Post-tensioning:
In post-tensioning, the tendons are tensioned after the concrete has hardened. This is achieved by inserting the tendons into ducts or sleeves and then tensioning them using hydraulic jacks. The tendons are then anchored to the structure.
Conclusion:
From the given statements, only statement 2 is correct. In the pre-tensioning method, tension is indeed induced in the tendons before concreting. This is achieved by stretching the tendons using hydraulic jacks and anchoring them to the ends of the structure. The tension in the tendons is then transferred to the concrete when it is poured and hardens around the tendons.
Explanation:
In pre-tensioning method, the tendons are first tensioned before the concrete is placed. This is achieved by stretching the tendons using hydraulic jacks and anchoring them to the ends of the structure. Once the tendons are tensioned, the concrete is poured and allowed to harden around the tendons. This process creates a compressive force in the concrete and a corresponding tensile force in the tendons.
Advantages of Pre-tensioning:
1. Higher efficiency: Pre-tensioning allows for higher efficiency compared to post-tensioning as the tendons are tensioned before the concrete is poured. This results in a more efficient transfer of forces between the tendons and the concrete.
2. Increased load-carrying capacity: By pre-tensioning the tendons, the concrete is initially placed under compression. This increases its load-carrying capacity and allows for the construction of longer spans without the need for additional supports.
3. Reduced cracking: Pre-tensioning helps in reducing cracking in the concrete structure. The initial compressive force in the concrete helps to counteract the tensile stresses induced by external loads, thereby reducing the likelihood of cracking.
Comparison with Post-tensioning:
In post-tensioning, the tendons are tensioned after the concrete has hardened. This is achieved by inserting the tendons into ducts or sleeves and then tensioning them using hydraulic jacks. The tendons are then anchored to the structure.
Conclusion:
From the given statements, only statement 2 is correct. In the pre-tensioning method, tension is indeed induced in the tendons before concreting. This is achieved by stretching the tendons using hydraulic jacks and anchoring them to the ends of the structure. The tension in the tendons is then transferred to the concrete when it is poured and hardens around the tendons.
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In the pre-tensioning method, which of the following statements are correct?1) The tension in the concrete is induced directly by external force2) Tension is induced in the tendons before concreting3) Concrete continues to be in tension after pre-stressinga)1 onlyb)2 onlyc)3 onlyd)1 and 3 onlyCorrect answer is option 'B'. Can you explain this answer?
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