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The loss due to creep in pre-stressed concrete shall be determined considering
- a)All loads and pre-stressing force
- b)Live loads and pre-stressing force
- c)Permanent loads and pre-stressing force
- d)Permanent loads only
Correct answer is option 'C'. Can you explain this answer?
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The loss due to creep in pre-stressed concrete shall be determined con...
Understanding Creep in Pre-stressed Concrete
Creep is the gradual deformation of concrete over time when subjected to sustained loading. In pre-stressed concrete, it is essential to account for this phenomenon to ensure structural integrity and serviceability.
Why Permanent Loads Matter
- Definition of Permanent Loads: These include dead loads such as the weight of the structure itself, fixtures, and any other constant loads that do not change over time.
- Impact on Creep: Permanent loads contribute to the long-term stress in the concrete. Since creep is time-dependent, it is essential to consider these loads when evaluating creep deformation.
Pre-stressing Force Consideration
- Role of Pre-stressing: The initial pre-stressing force is applied to counteract tensile stresses that may develop due to various loads. This force significantly influences how the concrete behaves under sustained loads.
- Interaction with Creep: The pre-stressing force works in conjunction with permanent loads, and both need to be factored into the creep calculations. Ignoring either can lead to underestimating or overestimating the deformation.
Why Not Live Loads?
- Live Loads Are Transient: Live loads, which include variable loads like occupants and furniture, are not constant over time. Creep primarily concerns itself with sustained loads.
- Short-Term Effects: Since live loads do not contribute to long-term deformation, they are excluded from creep calculations.
Conclusion
In summary, the correct approach to determine the loss due to creep in pre-stressed concrete involves considering both the permanent loads and the pre-stressing force. This ensures a more accurate prediction of the structure's behavior over its lifespan. Therefore, option 'C' is the correct answer.
Creep is the gradual deformation of concrete over time when subjected to sustained loading. In pre-stressed concrete, it is essential to account for this phenomenon to ensure structural integrity and serviceability.
Why Permanent Loads Matter
- Definition of Permanent Loads: These include dead loads such as the weight of the structure itself, fixtures, and any other constant loads that do not change over time.
- Impact on Creep: Permanent loads contribute to the long-term stress in the concrete. Since creep is time-dependent, it is essential to consider these loads when evaluating creep deformation.
Pre-stressing Force Consideration
- Role of Pre-stressing: The initial pre-stressing force is applied to counteract tensile stresses that may develop due to various loads. This force significantly influences how the concrete behaves under sustained loads.
- Interaction with Creep: The pre-stressing force works in conjunction with permanent loads, and both need to be factored into the creep calculations. Ignoring either can lead to underestimating or overestimating the deformation.
Why Not Live Loads?
- Live Loads Are Transient: Live loads, which include variable loads like occupants and furniture, are not constant over time. Creep primarily concerns itself with sustained loads.
- Short-Term Effects: Since live loads do not contribute to long-term deformation, they are excluded from creep calculations.
Conclusion
In summary, the correct approach to determine the loss due to creep in pre-stressed concrete involves considering both the permanent loads and the pre-stressing force. This ensures a more accurate prediction of the structure's behavior over its lifespan. Therefore, option 'C' is the correct answer.
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The loss due to creep in pre-stressed concrete shall be determined con...
As per IS 1343(1980): Code of Practice for Prestressed Concrete 19.5.2.1
Loss of prestress due to creep of concrete:
Loss of prestress due to creep of concrete:
- The loss of prestress due to the creep of concrete under load shall be determined for all the permanently applied loads including the prestress.
- The creep loss due to live load stresses, erection stresses, and other stresses of short duration may be ignored.
- The loss of prestress due to creep of concrete is obtained as the product of the modulus of elasticity of the prestressing steel and the ultimate creep strain of the concrete fiber integrated along the line of center of gravity of the prestressing tendon at the section at which creep loss is being calculated for bonded tendons.
- In the case of unbonded tendons, the creep loss is a product of modulus of elasticity of prestressing steel and creep strain calculated by integrating and averaging creep stress along the line of center of gravity between the anchorage points.
- The total creep strain during any specific period shall be assumed for all practical purposes, to be the creep strain due to sustained stress equal to the average of the stresses at the beginning and end of the period.
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The loss due to creep in pre-stressed concrete shall be determined consideringa)All loads and pre-stressing forceb)Live loads and pre-stressing forcec)Permanent loads and pre-stressing forced)Permanent loads onlyCorrect answer is option 'C'. Can you explain this answer?
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