Steel Design Sheet 14

1) Question.

As per IS: 800-1984, the maximum thickness of a plate girder web plate should not be less than.... for vertically stiffened webs.

[where d= Clear depth of plate girder]
Answer.
- 1
  
  d/85
- 2
  
  d/200
- 3
  
  d/250
- 4
  
  d/400
Answer: 2

Explanation:
2) Question.

According to Vawter and Clark formula, the economical depth of web plate of a plate girder is approximately equal to

[where, M= Maximum bending moment, and $σ_{b}$ = Allowable bending stress]
Answer.
- 1
  
  ${(M / σ_{b})}^{1 / 3}$
- 2
  
  $2.5 {(M / σ_{b})}^{1 / 3}$
- 3
  
  $3.5 {(M / σ_{b})}^{1 / 3}$
- 4
  
  $4.5 {(M / σ_{b})}^{1 / 3}$
Answer: 4

Explanation:
3) Question.

For all practical purposes, self weight of girder is taken as

[W= Total superimposed load, and l= Span of plate girder in metres]
Answer.
- 1
  
  $\frac{W l}{100}$
- 2
  
  $\frac{W l}{200}$
- 3
  
  $\frac{W l}{300}$
- 4
  
  $\frac{W l}{400}$
Answer: 3

Explanation:
4) Question.

In a plate girder, if M is maximum bending moment, $σ_{b}$ is allowable bending stress, and t is the thickness of web plate, then the economical depth of plate girder $(d_{e})$ is equal to
Answer.
- 1
  
  $0.1 \sqrt{\frac{M}{t . σ_{b}}}$
- 2
  
  $1.1 \sqrt{\frac{M}{t . σ_{b}}}$
- 3
  
  $2.1 \sqrt{\frac{M}{t . σ_{b}}}$
- 4
  
  $3.1 \sqrt{\frac{M}{t . σ_{b}}}$
Answer: 2

Explanation:
5) Question.

The weight of a plate girder varies 1 percent for... variation in the depth of the girder.
Answer.
- 1
  
  5%
- 2
  
  10%
- 3
  
  15%
- 4
  
  20%
Answer: 2

Explanation:
6) Question.

The rolled steel section used in cased beam has width B mm and diameter D mm. The minimum width of the finished cased beam is given by
Answer.
- 1
  
  $(B + 50 m m)$
- 2
  
  $(B + 100) m m$
- 3
  
  $(B + D + 100) m m$
- 4
  
  $2 (B + D) m m$
Answer: 2

Explanation:
7) Question.

The span of filler joists centre to centre of supports, should not exceed....the depth from the underside of the joist to the top of the structural concrete.
Answer.
- 1
  
  15 times
- 2
  
  25 times
- 3
  
  35 times
- 4
  
  45 times
Answer: 3

Explanation:
8) Question.

Bearing stiffeners are used in a plate girder
Answer.
- 1
  
  to avoid local bending failure of the flange
- 2
  
  to avoid local crippling and crushing of web
- 3
  
  under concentrated loads and at the points of supports
- 4
  
  all of the above
Answer: 4

Explanation:
9) Question.

The allowable shear stress in stiffened webs of mild steel beams decreases with
Answer.
- 1
  
  decrease in the spacing of the stiffeners
- 2
  
  increase in the spacing of the stiffeners
- 3
  
  decrease in the effective depth
- 4
  
  increase in the effective depth
Answer: 2

Explanation:
10) Question.

In a plate girder, the vertical stiffeners are provided at spacing not greater than.... and not less than 0.33d.

[ d= Distance between flange angles]
Answer.
- 1
  
  0.5 d
- 2
  
  0.75 d
- 3
  
  1.25 d
- 4
  
  1.5 d
Answer: 4

Explanation:

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