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The loss of prestress due to friction generally occurs in case of ______
- a)Post tensioned members
- b)Pre tensioned members
- c)Chemical members
- d)Electrical members
Correct answer is option 'A'. Can you explain this answer?
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The loss of prestress due to friction generally occurs in case of ____...
Understanding Prestress Loss Due to Friction
In civil engineering, prestressing is a technique used to improve the performance of concrete structures. The loss of prestress due to friction is an important consideration in post-tensioned members.
What is Post-Tensioning?
- Post-tensioning involves the installation of high-strength steel tendons within concrete after it has been poured and cured.
- The tendons are tensioned and anchored against the concrete, creating compressive stresses that counteract tensile forces experienced by the structure.
Friction Loss in Post-Tensioned Members
- During the tensioning process, friction occurs between the tendons and the duct (the sheath that holds the tendons).
- As the tendons are pulled, the friction between the tendon and the duct can cause a loss of tension in the tendon, leading to a reduction in the effective prestress force.
Factors Influencing Friction Loss
- Duct Material and Coating: The choice of duct material and any coatings can affect the level of friction.
- Curvature of the Duct: Changes in direction or curvature of the duct can increase friction losses.
- Tendon Condition: The condition of the tendons, such as surface roughness and lubrication, influences friction.
Consequences of Friction Loss
- Reduced prestress can lead to increased deflection and cracking in the concrete.
- It may necessitate adjustments during the design phase to ensure structural integrity and performance.
In conclusion, understanding the loss of prestress due to friction is crucial in the design and execution of post-tensioned structures, ensuring they meet safety and performance standards.
In civil engineering, prestressing is a technique used to improve the performance of concrete structures. The loss of prestress due to friction is an important consideration in post-tensioned members.
What is Post-Tensioning?
- Post-tensioning involves the installation of high-strength steel tendons within concrete after it has been poured and cured.
- The tendons are tensioned and anchored against the concrete, creating compressive stresses that counteract tensile forces experienced by the structure.
Friction Loss in Post-Tensioned Members
- During the tensioning process, friction occurs between the tendons and the duct (the sheath that holds the tendons).
- As the tendons are pulled, the friction between the tendon and the duct can cause a loss of tension in the tendon, leading to a reduction in the effective prestress force.
Factors Influencing Friction Loss
- Duct Material and Coating: The choice of duct material and any coatings can affect the level of friction.
- Curvature of the Duct: Changes in direction or curvature of the duct can increase friction losses.
- Tendon Condition: The condition of the tendons, such as surface roughness and lubrication, influences friction.
Consequences of Friction Loss
- Reduced prestress can lead to increased deflection and cracking in the concrete.
- It may necessitate adjustments during the design phase to ensure structural integrity and performance.
In conclusion, understanding the loss of prestress due to friction is crucial in the design and execution of post-tensioned structures, ensuring they meet safety and performance standards.
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The loss of prestress due to friction generally occurs in case of ____...
Loss of prestress due to friction occurs in the case of post tensioned members, the tendons are housed in the ducts performed in concrete and the ducts are either straight or follow a curved profile depending upon the design requirements.
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