Which of the following assumptions is used for the design of an axially loaded compression member (steel)?

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SSC JE Civil 16 Nov 2022 Shift 1 Official Paper
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  1. The modulus of elasticity is not assumed to be constant.
  2. Secondary stresses are neglected.
  3. 25% to 40% of secondary stresses are taken into account.
  4. The ideal column is not straight and has crookedness.

Answer (Detailed Solution Below)

Option 2 : Secondary stresses are neglected.
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Detailed Solution

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Explanation:

Compression member:

  • A compression member is a structural member which is straight and subjected to two equal and opposite compressive forces applied at its ends.

Assumptions made while designing a compression member (or column):

  • The ideal column is assumed to be absolutely straight having no crookedness, which never occurs in practice.
  • The modulus of elasticity is assumed to be constant in a built-up column.
  • Secondary stresses(which may be of the order of even 25%-40% of primary stresses) are neglected.
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