Civil Engineering - Steel Structure Design

31. 

A long plate girder is subjected to a maximum bending moment M in which permitted allowable bending stress is fb. The economical depth de and the thickness of the web tw, is given by

A.
B.
C.
D.
E. none of these.

Answer: Option B

Explanation:

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32. 

The beams supporting the steps of a stair are generally known as

A. headers
B. trimmers
C. stringers
D. spandrel beams.

Answer: Option C

Explanation:

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33. 

In a grillage column footing maximum bending moment M occurs at the centre of grillage beams. Its value is (where P, L and a are axial load, length of the beam and length of the column base respectively).

A. M = P(L - a)
B.
C.
D.
E.

Answer: Option C

Explanation:

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34. 

For a steel grillage footing to support two unequal column loads

A. line of action of the resultant of two column loads, is made to coincide with the centre of gravity of the base of the footing
B. trapezoidal shape is used for the base footing
C. projections of beams on either side in lower tier are such that bending moments under columns are equal
D. bending moment under the columns are kept equal to the bending moment between to two columns
E. all the above.

Answer: Option E

Explanation:

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35. 

In case of cantilever fillers, the ratio of the span L to depth d, should not exceed

A. 4
B. 8
C. 12
D. 16
E. 20

Answer: Option C

Explanation:

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