Civil Engineering - Steel Structure Design

36. 

Secant formula for direct stress in compression, is applicable only for slenderness ratio upto

A. 120
B. 130
C. 140
D. 150
E. 160

Answer: Option C

Explanation:

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37. 

A second horizontal stiffener is always placed at the neutral axis of the girder if the thickness of the web is less than

A. d/250 for structural steel
B. d/225 for high tensile steel
C. both (c) and (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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38. 

The rolled steel I-sections are most commonly used as beams because these provide

A. large moment of inertia with less cross-sectional area
B. large moment of resistance as compared to other section
C. greater lateral stability
D. all the above.

Answer: Option D

Explanation:

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39. 

The thickness t of a single flat lacing should not be less than

A. 1/30 th length between inner end rivets
B. 1/40 th length between inner end rivets
C. 1/50 th length between inner end rivets
D. 1/60 th length between inner end rivets
E. none of these.

Answer: Option B

Explanation:

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40. 

For the steel member exposed to weather and accessible for repainting, the thickness of steel should not be less than (excepting the webs of Indian Standard rolled steel joists and channels).

A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mm

Answer: Option B

Explanation:

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