Civil Engineering :: Steel Structure Design
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Long column is one
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Rolled steel beams are :
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Tacking rivets in tension members, are provided at a pitch in line not exceeding
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The effective length of a compression member of length L held in position at both ends but not restrained in direction, is
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When the ratio of the moment M to axial load P is greater than
, the resultant of the compressive bearing pressure which acts at a distance Y from one side, is given by -
Under a concentrated load, bearing stress fb in a beam, is given by (where b is the length of the bearing plate and h is the depth of the root of the fillet).
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If R is the reaction on the bearing plate, the minimum moment of. inertia of the bearing stiffener provided at the support of a plate girder of overall depth D, the maximum thickness of the compression flange T, carrying total load W, is
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A beam may be designed as a cased beam if
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The economical depth d of a web plate in which allowable bearing stress is fb, and the maximum bending moment is M, as suggested by Rawater and Clark, is
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For a single section used as a tension member, the given area is assumed
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A.
section is of double open channel form with the webs not less than 40 mm apart
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B.
overall depth and width of the steel section do not exceed 750 and 450 mm respectively.
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C.
beam is solidly encased in concrete with 10 mm aggregate having 28 days strength 160 kg/cm2
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D.
width of the solid casing is kept at least 100 mm more than the width of the steel flange and having a concrete cover of 50 mm
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E.
all the above.
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