Warping constant in elastic critical moment is given by(a) (1+βf)βf Iy h^2f(b) (1-βf)βf Iy h^2f(c) βf Iy h^2f(d) (1-βf)/βf Iy h^2fI got this question in unit test.My question comes from Design Strength of Laterally Unsupported Beams in division Design of Beams of Design of Steel Structures

Warping constant in elastic critical moment is given by(a) (1+βf)βf

1.	Warping constant in elastic critical moment is given by(a) (1+βf)βf Iy h^2f(b) (1-βf)βf Iy h^2f(c) βf Iy h^2f(d) (1-βf)/βf Iy h^2fI got this question in unit test.My question comes from Design Strength of Laterally Unsupported Beams in division Design of Beams of Design of Steel Structures
Answer» The CORRECT answer is (b) (1-βf)βf Iy h^2f The explanation: Warping constant in elastic CRITICAL MOMENT is given by Iw = (1-βf)βf Iy h^2f, where βf is ratio of moment of inertia of compression flange to sum of MOMENTS of inertia of compression and tension flanges, Iy = moment of inertia about minor axis, hf = centre-to-centre DISTANCE between flanges.

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