For different loading conditions, the equation of elastic critical moment is given by(a) Mcr = c1(EIyGIt) γ(b) Mcr = c1 [(EIyGIt)^2] γ(c) Mcr = c1 [√(EIyGIt)] γ(d) Mcr = c1 (EIy /GIt) γI have been asked this question by my school teacher while I was bunking the class.The query is from Lateral Torsional Buckling in section Design of Beams of Design of Steel Structures

For different loading conditions, the equation of elastic critical mom

1.	For different loading conditions, the equation of elastic critical moment is given by(a) Mcr = c1(EIyGIt) γ(b) Mcr = c1 [(EIyGIt)^2] γ(c) Mcr = c1 [√(EIyGIt)] γ(d) Mcr = c1 (EIy /GIt) γI have been asked this question by my school teacher while I was bunking the class.The query is from Lateral Torsional Buckling in section Design of Beams of Design of Steel Structures
Answer» Correct answer is (c) Mcr = c1 [√(EIyGIt)] γ The BEST I can explain: For different loading conditions, the equation of ELASTIC critical moment is given by Mcr = c1 [√(EIyGIt)] γ, where c1 = equivalent uniform moment FACTOR or moment coefficient, EIy = flexural rigidity(minor axis), GIt = torsional rigidity, γ = (π/L){√[1 + (πE/L)^2IwIy]}, It= St.Venant torsion constant, Iw = St.Venant warping constant, L = unbraced LENGTH of beam subjected to constant moment in plane of web.

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