engineering recuitment GATE CE 2023-24 Test Series Reinforced Concrete Structures Prestress Concrete Losses in Prestress
Consider the given statements about Prestressed concrete and the losses associated with pre-tensioning and post-tensioning systems. Which of the following statement(s) is/are true in relation to the prestressed concrete?
1
Minimum specified strength of concrete for Pre-tensioned and Post-tensioned members are M30 and M40 respectively.
2
Final stress in the prestressing steel after accounting for all the losses should not be less than 0.45 times the characteristic tensile strength of the steel.
3
The losses in the prestress due to creep, shrinkage, stress relaxation in the steel and slip due to the anchorage are categorised under time-dependent losses
4
The use of ‘concordant cables’ in prestressed continuous Beam induces the initial support reactions.