Civil Engineering :: Steel Structure Design
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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
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The beams supporting the steps of a stair are generally known as
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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).
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For a steel grillage footing to support two unequal column loads
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In case of cantilever fillers, the ratio of the span L to depth d, should not exceed
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The rivets which are heated and then driven in the field, are known
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The strength of a riveted lap joint is equal to its
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The slenderness ratio of a column is zero when its length
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If f is the maximum allowable bending stress in a tension member whose radius of gyration is r and depth is 2y, the required cross sectional area A is given by
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The main advantage of a steel member, is :
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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
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B.
trapezoidal shape is used for the base footing
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C.
projections of beams on either side in lower tier are such that bending moments under columns are equal
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D.
bending moment under the columns are kept equal to the bending moment between to two columns
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E.
all the above.
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