The anchorage slip is observed in __________a)Post tensioned membersb)...
Explanation:
The anchorage slip is observed in pre-tensioned members. Let's understand why this is the correct answer.
1. Introduction to Pre-tensioned members:
- Pre-tensioning is a method used in prestressed concrete construction where the tendons are tensioned before the concrete is cast.
- In pre-tensioned members, the tendons are tensioned against the hardened concrete, creating a compressive force in the member even before any external loads are applied.
- This compression helps in reducing the tensile stresses induced by external loads, making the member stronger and more resistant to cracking.
2. Anchorage Slip:
- Anchorage slip refers to the relative movement between the prestressing tendon and the anchorage device or the concrete member.
- During pre-tensioning, the tendons are anchored at both ends using specialized anchorages.
- The anchorage at the tensioning end is usually fixed, while the anchorage at the other end allows for some degree of movement or slip to accommodate the elongation of the tendon during tensioning.
- The slip occurs at the anchorage interface due to various factors such as friction, seating, and relaxation of the prestressing tendon.
3. Causes of Anchorage Slip:
- Friction: The friction between the tendon and the anchorage device or the duct enclosing the tendon can cause slip. It depends on factors like surface roughness, tendon diameter, and the type of material used.
- Seating: Seating refers to the initial embedment of the tendon into the anchorage device. During tensioning, some seating slip may occur due to the compression of the concrete and the relaxation of the tendon.
- Relaxation: Prestressing tendons experience a phenomenon called relaxation, where they lose some of the initial tension over time. This relaxation can cause slip at the anchorage interface.
4. Consequences of Anchorage Slip:
- Anchorage slip can lead to a reduction in the prestress force transferred to the concrete member, affecting its structural performance.
- It can result in increased deflections, cracking, and decreased load-carrying capacity.
- Excessive slip can compromise the structural integrity of the member and may require additional remedial measures.
5. Conclusion:
In summary, the anchorage slip is observed in pre-tensioned members due to factors such as friction, seating, and relaxation of the prestressing tendon. It is important to consider and control the slip to ensure the desired level of prestress is achieved and the structural performance of the member is maintained.
The anchorage slip is observed in __________a)Post tensioned membersb)...
The anchorage slip is observed in post tensioned members at the time of transfer of prestress to the concrete and the friction wedges employed to grip the wires, slip over a small distance before the wires are firmly housed between the wedges.
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