The optimum depth of web of plate girder is given by(a) (k/fy)^0.33(b) (Mzk/fy)(c) (Mzk/fy)^0.33(d) (Mzk/fy)^2I got this question during an interview.The doubt is from Proportioning of Web & Flanges topic in section Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

The optimum depth of web of plate girder is given by(a) (k/fy)^0.33(b)

1.	The optimum depth of web of plate girder is given by(a) (k/fy)^0.33(b) (Mzk/fy)(c) (Mzk/fy)^0.33(d) (Mzk/fy)^2I got this question during an interview.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» CORRECT CHOICE is (c) (Mzk/fy)^0.33 Explanation: The depth of plate girder for which area of steel used is minimum and will have minimum weight is called optimum depth. It is GIVEN by (Mzk/fy)0.33, Mz is moment resisted ENTIRELY by flanges, k = d/tw, d is depth of web, tw is thickness of web, fy = DESIGN strength of flanges.

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