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Doctors Medicines MCQs Q&A

  1. H section
  2. Pipe section (circular)
  3. Angles
  4. I section
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1 Answers

Option 4 : I section

Explanation:

Use of I-section as beam:

  • A beam is expected to resist bending and shear stresses. Bending stress is zero at the center and maximum at the top and bottom layer of the beam. While shear stress is maximum at the center and zeroes at the top and bottom layers.
  • In the I section, the web resists shear forces, while the flanges resist more than 80% of the bending moment. Beam theory shows that the I-shaped section is a very efficient form for carrying both bending and shear loads in the plane of the web.
  • Even though the I-cross-section has a reduced capacity in the transverse direction, and is also inefficient in carrying torsion, for which hollow structural sections are often preferred, the latter is more complicated and expensive to manufacture.

∴ For all practical purposes, an economical and efficient I-section is used.

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