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Q: In a singly reinforced beam
  • A. compression is borne entirely by concrete
  • B. steel possesses initial stresses when embeded in concrete
  • C. plane sections transverse to the center line of the beam before bending remain plane after bending
  • D. None of these
Correct Answer: Option A - Compression is borne entirely by concrete–This is true for normally loaded singly reinforced beam but during reversal of loads due to earthquake, wind load etc, the steel may take up compression. Steel possesses initial stresses when embedded in concrete–This is false, in RCC steel does not possesses any initial stress when embedded in concrete. In PSC, steel possesses initial stress when embedded in concrete. As per assumptions in limit state of collapse : flexure the plane section normal to the axis remains plane after bending.
A. Compression is borne entirely by concrete–This is true for normally loaded singly reinforced beam but during reversal of loads due to earthquake, wind load etc, the steel may take up compression. Steel possesses initial stresses when embedded in concrete–This is false, in RCC steel does not possesses any initial stress when embedded in concrete. In PSC, steel possesses initial stress when embedded in concrete. As per assumptions in limit state of collapse : flexure the plane section normal to the axis remains plane after bending.

Explanations:

Compression is borne entirely by concrete–This is true for normally loaded singly reinforced beam but during reversal of loads due to earthquake, wind load etc, the steel may take up compression. Steel possesses initial stresses when embedded in concrete–This is false, in RCC steel does not possesses any initial stress when embedded in concrete. In PSC, steel possesses initial stress when embedded in concrete. As per assumptions in limit state of collapse : flexure the plane section normal to the axis remains plane after bending.