Product(s):	SACS
Version(s):	All
Area:	Post Solutions

Community Question:

Hello Bentley, I would like to know how SACS gets the Flexural Slenderness and Flexural Buckling Factos, and how the elastic critical moment (Mcr) when is working with  the Eurocode

Answer:

You can get the value for Flexural Slenderness using the formula in the code Eurocode 3.1993.1.1.2005 section 6.3.1.3 Slenderness for flexural buckling and this depends on the classification of the section.

For the Flexural Buckling Factor, the formulation is the next and this depends on the type of section to analyze

The elastic critical moment for lateral-torsional buckling Mcr can be calculated using the next formulation

Where 

E = Elastic Modulus

Iz = Moment of Inertia

G = Shear Modulus

J = Tors. Constant

Cw = Warping Const

Ly = Overall Buck. Length

Ky = Eff. Length Factor

C1 = This value is given in Table 6.10 for end-moment loading and may be approximated by the equation 

 ,

where  ψ = ratio of end moments in the segment

Example:

Cross-section classification: Class 1

 Comparing