Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > in pre-stressed concretea)Forces of tension a...
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in pre-stressed concrete
- a)Forces of tension and 'compression change1 but lever arm remains unchanged
- b)Forces of tension and compressions remain unchanged but lever arm changes with the moment
- c)Both forces of tension and compression as well as lever arm change
- d)Both forces of tension and compression as well as lever arm remain unchanged
Correct answer is option 'B'. Can you explain this answer?
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in pre-stressed concretea)Forces of tension and compression change1 bu...
Answer:
Forces of tension and compression in pre-stressed concrete remain unchanged but lever arm changes with the moment. This can be explained as follows:
Forces of tension and compression in pre-stressed concrete:
- Pre-stressed concrete is a type of reinforced concrete in which high-strength steel strands or tendons are tensioned before the concrete is cast.
- The tensioned tendons are anchored to the concrete at the ends and are then released, causing them to exert a compressive force on the concrete.
- This compression counteracts the tensile stresses that occur when the concrete is subjected to external loads, such as the weight of a building or bridge.
Lever arm in pre-stressed concrete:
- The lever arm is the distance between the force and the point where it is applied.
- In pre-stressed concrete, the lever arm changes with the moment, which is the tendency of a force to cause rotation around a point.
- When a moment is applied to a pre-stressed concrete member, such as a beam or slab, the lever arm changes as the point of application of the force moves closer or further away from the point of rotation.
- This change in lever arm affects the distribution of stresses within the member and can lead to cracking or failure if not properly accounted for in the design.
Conclusion:
In conclusion, forces of tension and compression in pre-stressed concrete remain unchanged, but the lever arm changes with the moment. This change in lever arm must be taken into account in the design of pre-stressed concrete members to ensure their safety and durability.
Forces of tension and compression in pre-stressed concrete remain unchanged but lever arm changes with the moment. This can be explained as follows:
Forces of tension and compression in pre-stressed concrete:
- Pre-stressed concrete is a type of reinforced concrete in which high-strength steel strands or tendons are tensioned before the concrete is cast.
- The tensioned tendons are anchored to the concrete at the ends and are then released, causing them to exert a compressive force on the concrete.
- This compression counteracts the tensile stresses that occur when the concrete is subjected to external loads, such as the weight of a building or bridge.
Lever arm in pre-stressed concrete:
- The lever arm is the distance between the force and the point where it is applied.
- In pre-stressed concrete, the lever arm changes with the moment, which is the tendency of a force to cause rotation around a point.
- When a moment is applied to a pre-stressed concrete member, such as a beam or slab, the lever arm changes as the point of application of the force moves closer or further away from the point of rotation.
- This change in lever arm affects the distribution of stresses within the member and can lead to cracking or failure if not properly accounted for in the design.
Conclusion:
In conclusion, forces of tension and compression in pre-stressed concrete remain unchanged, but the lever arm changes with the moment. This change in lever arm must be taken into account in the design of pre-stressed concrete members to ensure their safety and durability.
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in pre-stressed concretea)Forces of tension and compression change1 but lever arm remains unchangedb)Forces of tension and compressions remain unchanged but lever arm changes with the momentc)Both forces of tension and compression as well as lever arm changed)Both forces of tension and compression as well as lever arm remain unchangedCorrect answer is option 'B'. Can you explain this answer?
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