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What is the range of c to meet serviceability criteria when transverse and longitudinal stiffeners are provided at one level only, at 0.2d from compression flange and c/tw ≤ 250 εw ?(a) c < 0.74d(b) 0.74d ≤ c ≤ d(c) c ≥ d(d) c > 2dThe question was asked in a national level competition.The doubt is from Proportioning of Web & Flanges topic in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

Answer»

Right option is (b) 0.74d ≤ c ≤ d

To explain I WOULD say: For serviceability criteria, when transverse and longitudinal stiffeners are PROVIDED at one level only, at 0.2d from compression FLANGE d/tw ≤ 250 εw for 2.4d ≥c ≥ d, c/tw ≤ 250 εw for 0.74d ≤ c ≤ d and d/tw ≤ 340 εw for c < 0.74d, where c is clear distance between stiffeners and d is depth of web, εw = √(250/FYW), fyw is yield stress of web.



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