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Which of the following is NOT an advantage of pre-stressed beams?

Which of the following is NOT an advantage of pre-stressed beams? Correct Answer Pre-stress beams do not require any auxiliary unit.

Concept:

Prestressed Beam :

Prestressed concrete is a form of concrete used in construction in a prestressed concrete member, the internal stresses are introduced in a planned manner, so That the stresses resulting from the superimposed loads are counteracted to the desired degree.

Advantages:

  • It is suitable for long-span structures and liquid retaining structures.
  • The load-carrying capacity of the beam is also higher.
  • Pre-stressed beams are light in weight.
  • It reduces the deflection and hence higher stiffness.
  • Pre-stressed beams do not require heavy shear reinforcement.
  • Sections are considered uncracked while analysis because the members are free from tensile stresses, and thus protect the steel from corrosion.
  • The prestressing force induces compression on the section which increases the shear capacity of the section.
  • The whole section of the pre-stressed beam is useful.
  • It has high resistance against fatigue, impact, cracks, and corrosion.
  • Practically, dead loads are neutral in a prestressed concrete beam. Consequently, the dead load weight of the structure is decreased which results in reduced consumption of materials.

Hence, Pre-stress beams do not require any auxiliary unit  is not an advantage of pre-stressed beams.

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