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Q: A pre-stressed concrete member is preferred because:
  • A. Its dimensions are not decided from the diagonal tensile stress
  • B. Large size of long beams carrying large shear force need not be adopted
  • C. Removal of cracks in the members due to shrinkage
  • D. All of the above
Correct Answer: Option D - A prestressed concrete member is preferred because- (i) Its dimensions are not decided from the diagonal tensile stress (ii) Removal of cracks in the members due to shrinkage (iii) As dead load moments are neutralized and the shear stresses are reduced, the sections required are much smaller than those of reinforced concrete. This reduced the dead weight of structure. (iv) It is widely used for construction of precast units such as beams, floors, roofing systems, bridges, folded plate roofs, marine structure, towers and railway sleepers.
D. A prestressed concrete member is preferred because- (i) Its dimensions are not decided from the diagonal tensile stress (ii) Removal of cracks in the members due to shrinkage (iii) As dead load moments are neutralized and the shear stresses are reduced, the sections required are much smaller than those of reinforced concrete. This reduced the dead weight of structure. (iv) It is widely used for construction of precast units such as beams, floors, roofing systems, bridges, folded plate roofs, marine structure, towers and railway sleepers.

Explanations:

A prestressed concrete member is preferred because- (i) Its dimensions are not decided from the diagonal tensile stress (ii) Removal of cracks in the members due to shrinkage (iii) As dead load moments are neutralized and the shear stresses are reduced, the sections required are much smaller than those of reinforced concrete. This reduced the dead weight of structure. (iv) It is widely used for construction of precast units such as beams, floors, roofing systems, bridges, folded plate roofs, marine structure, towers and railway sleepers.