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Q: The rolled steel I-sections are most commonly used as beams because of which of the following reasons?
  • A. They have greater lateral stability, larger moment of resistance and higher moment of inertia with less cross-sectional area
  • B. They have large moment of resistance as compared to other sections and have large moment of inertia with less cross-sectional area only
  • C. They provide greater lateral stability and have large moment of inertia with less cross-sectional area only
  • D. They provide greater lateral stabiility and have large moment of resistance as compared to other sections only.
Correct Answer: Option A - The rolled steel I-sections are symmetrical sections, in these sections more material is placed near top and bottom faces. • The rolled steel I-section provide greater lateral stability, larger moment of resistance and higher moment of inertia with less cross-sectional area. I-sections and wide flanges beam sections have excellent strength.
A. The rolled steel I-sections are symmetrical sections, in these sections more material is placed near top and bottom faces. • The rolled steel I-section provide greater lateral stability, larger moment of resistance and higher moment of inertia with less cross-sectional area. I-sections and wide flanges beam sections have excellent strength.

Explanations:

The rolled steel I-sections are symmetrical sections, in these sections more material is placed near top and bottom faces. • The rolled steel I-section provide greater lateral stability, larger moment of resistance and higher moment of inertia with less cross-sectional area. I-sections and wide flanges beam sections have excellent strength.