What is end block in prestressed concrete?

A portion of a pre-stressed member surrounding the anchorage is the end block. Through the length of the end block, pre-stress is transferred from concentrated areas to become linearly distributed fiber stresses at the end of the block.

What is function of end block?

The END blocks are the last thing to be evaluated. They are even evaluated after exit() or die() functions are called. Therefore, they can be used to close files or write messages to log files.

Why reinforcement is necessary in Anchorage zone or end block?

Because the main reinforcement in the anchorage zone should be designed to withstand the bursting tension, which is determined by the traverse stress distribution on the critical axis, usually coinciding with the line of action of the largest individual force.

What is the purpose of reinforcement in prestressed concrete?

1. To improve the resistance of the member to the dead and live loads. 2. To modify the behavior of the member or structure in such a way so as to make it more suitable for its intended purpose.

Why shear reinforcement is provided Mcq?

Explanation: When V the shear force due to ultimate loads is less than the shear force of the concrete vc, the shear force which can be carried by the concrete, a minimum shear reinforcement should be provided in the form of stirrups with spacing.

Which sections provide one monolithic action between prefabricated units?

Composite construction consists of providing monolithic action between (i) Prefabricated units like steel beams, precast reinforced or prestressed concrete beams and (ii) Cast-in-situ concrete.

What is end zone reinforcement?

zone of a pre-tensioned beam. To restrict the splitting of concrete, transverse reinforcement (in addition to the reinforcement for shear) needs to be provided at each end of a member along the transmission length. This reinforcement is known as end zone reinforcement.

What are necessary to prevent failure at the end zones in the transfer zone of Pretensioned beams?

Explanation: In the transfer zone of pretensioned beams, transverse reinforcements are necessary to prevent the failure of the end zones due to cracking of concrete as a consequence of large transverse tensile stresses, which often exceed the tensile strength of concrete.

What is anchorage zone of end block?

The zone between the end of the beam and the section where only longitudinal stress exists is generally referred to as the anchorage zone or end block zone. The end zone (or end block) of a post-tensioned member is a flared region which is subjected to high stress from the bearing plate next to the anchorage block.

Which of the following basic concept is involved in the analysis of prestressed concrete members?

Explanation: The basic concept involved in the analysis of prestressed concrete members is concept of combined direct and bending stresses used for columns whereas principle and shear stresses are formed in case of tensioning the prestressed and reinforced structures, overhead stresses are formed while the stresses in …

Which type of loss does not occur pre tensioning?

Loss due to Friction: The friction generated at the interface of concrete and steel during the stretching of a curved tendon in a post-tensioned member. The loss due to friction does not occur in pre-tensioned members because there is no concrete during the stretching of the tendons.