The elastic critical moment is given by(a) Mcr= βb fcr,b(b) Mcr= βbZp / fcr,b(c) Mcr= βbZp(d) Mcr= βbZp fcr,bThe question was asked in examination.The doubt is from Design Strength of Laterally Unsupported Beams in chapter Design of Beams of Design of Steel Structures

The elastic critical moment is given by(a) Mcr= βb fcr,b(b) Mcr= βbZ

1.	The elastic critical moment is given by(a) Mcr= βb fcr,b(b) Mcr= βbZp / fcr,b(c) Mcr= βbZp(d) Mcr= βbZp fcr,bThe question was asked in examination.The doubt is from Design Strength of Laterally Unsupported Beams in chapter Design of Beams of Design of Steel Structures
Answer» The correct choice is (d) Mcr= βbZp FCR,b To elaborate: The ELASTIC critical moment is GIVEN by Mcr= √{[π^2EIy/ L^2MLT][ GIt + (π^2EIw/L^2LT)]} = βbZp fcr,b , IY = moment of inertia about minor axis, Iw =warping constant, It = St. Venant’s constant, G = Shear MODULUS.

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The elastic critical moment is given by(a) Mcr= βb fcr,b(b) Mcr= βbZp / fcr,b(c) Mcr= βbZp(d) Mcr= βbZp fcr,bThe question was asked in examination.The doubt is from Design Strength of Laterally Unsupported Beams in chapter Design of Beams of Design of Steel Structures

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