Steel Design Sheet 26

1) Question.

The formula which takes into account any initial crookedness of the column and imperfectness of axial loading is
Answer.
- 1
  
  Perry-Robertson formula
- 2
  
  Euler's formula
- 3
  
  Secant formula
- 4
  
  Rankine's formula
Answer: 3

Explanation:
2) Question.

In order to determine the allowable stress in axial compression, Burean of Indian Standards (BIS) has adopted
Answer.
- 1
  
  Perry - Robertson formula
- 2
  
  Euler's formula
- 3
  
  Secant formula
- 4
  
  Rankine's formula
Answer: 3

Explanation:
3) Question.

Rankine - Gordon formula for buckling load is adopted for columns having slenderness ratio
Answer.
- 1
  
  more than 120
- 2
  
  less than 120
- 3
  
  more than 120 and less than 200
- 4
  
  none of these
Answer: 3

Explanation:
4) Question.

The tangent modulus formula for the buckling load $(W_{c r})$ of an axially loaded column is

[ $E_{l}$ = Tangent modulus of elasticity]
Answer.
- 1
  
  $W_{c r} = \frac{π^{2} E_{l} I}{l^{2}}$
- 2
  
  $W_{c r} = \frac{π^{2} E_{l} I}{2 l^{2}}$
- 3
  
  $W_{c r} = \frac{π^{2} E_{l} I}{3 l^{2}}$
- 4
  
  $W_{c r} = \frac{π^{2} E_{l} I}{4 l^{2}}$
Answer: 1

Explanation:
5) Question.

According to Euler's formula, the critical stress $(σ_{c r})$ in a column for elastic buckling is given by

[where E= Young's modulus, l= Effective length of column, and r= Radius of gyration]
Answer.
- 1
  
  $σ_{c r} = \frac{π^{2} E}{l / r}$
- 2
  
  $σ_{c r} = \frac{π^{2} E}{{(l / r)}^{2}}$
- 3
  
  $σ_{c r} = \frac{π^{2} E}{{(l / r)}^{3}}$
- 4
  
  $σ_{c r} = \frac{π^{2} E}{{(l / r)}^{4}}$
Answer: 2

Explanation:
6) Question.

The effective length of a column with one end effectively held in position and restrained against rotation and partially restrained against rotation but not held in position at the other end is
Answer.
- 1
  
  0.65 L
- 2
  
  0.8 L
- 3
  
  1.5 L
- 4
  
  2 L
Answer: 3

Explanation:
7) Question.

The effective length of a structural steel compression member of length L effectively held in position and restrained against rotation at one end but neither held in position not restrained against rotation at the other end, is
Answer.
- 1
  
  L
- 2
  
  1.2 L
- 3
  
  1.5 L
- 4
  
  2 L
Answer: 4

Explanation:
8) Question.

The Euler's formula for columns is valid for
Answer.
- 1
  
  zero slenderness ratio
- 2
  
  small slenderness ratio
- 3
  
  large slenderness ratio
- 4
  
  all of these
Answer: 3

Explanation:
9) Question.

The average axial stress in the column at the time of its failure is......... the yield strength of the material.
Answer.
- 1
  
  equal to
- 2
  
  less than
- 3
  
  more than
Answer: 2

Explanation:
10) Question.

Maximum slenderness ratio of a compression member which carry loads resulting from wind or seismic forces only, is
Answer.
- 1
  
  180
- 2
  
  250
- 3
  
  300
- 4
  
  350
Answer: 2

Explanation:

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