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The second moment of area of torsional stiffeners about center line of the web is given as

The second moment of area of torsional stiffeners about center line of the web is given as Correct Answer Is ≥ 0.34αsD3Tcf

When bearing stiffeners are required to provide torsional restraint at the support of the beams, the second moment of area of the stiffener section about center line of the web should be such that Is ≥ 0.34αsD3Tcf , where αs = 0.006 for LLT/ry ≤50, 0.3/( LLT/ry) for 50LT/ry≤100, 30/( LLT/ry)2 for LLT/ry ≥100, D = overall depth of beam at the support, Tcf = maximum thickness of compression flange in the span under consideration, KL = laterally unsupported effective length of compression flange of beam, ry = radius of gyration of the beam about minor axis.

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i) reduces the negative moment at support
ii) increases the negative moment at support
iii) reduces the positive moment at center of span
iv) increases the positive moment at center of span
The correct answer is
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