Buckling length in sway and non-sway structures

By |August 31st, 2017|• Structural Steel, • Stability, FEA: Intermediate, FEA Topics:, • Linear Buckling, Structural Design Topics:|

One of the few difficult things about buckling lengths is, that you need to know if your structure is a "sway" structure or a "non-sway" structure. Commonly the simple check is made with displacements, but unfortunately, it may lead to serious mistakes! Why should you care about sway and non-sway system Firstly, I want to [...]

Linear vs nonlinear buckling explained!

By |January 24th, 2017|• Linear Analysis, • Nonlinear Analysis, FEA: Intermediate, FEA Topics:, • Linear Buckling, FEMAP|

Choosing between linear buckling and nonlinear buckling in given case can be difficult. Both approaches have positive and negative aspects. I explain here what are the differences, and when to use each analysis. I promise not to use complicated mathematics, nor highly theoretical approach. Instead, I will use a simple example to easily describe differences. [...]

Linear buckling in plain language!

By |January 2nd, 2017|FEA: Basics, • Linear Analysis, • Stability, FEA: Intermediate, FEA Topics:, • Linear Buckling, Structural Design Topics:|

Buckling is a dangerous phenomenon. It can lead to catastrophic failure of a structure, even if stresses are far smaller than yield limit. You can use linear buckling analysis to verify structural stability. In this post, I will discuss positive aspects and limitations of linear buckling. […]

Critical bending moment: How to calculate it with numerical analysis (in RFEM)

By |May 29th, 2016|• Structural Steel, • Stability, FEA: Intermediate, FEA Topics:, • Linear Buckling, Structural Design Topics:, RFEM|

Lateral torsion buckling (LTB) is a very dangerous phenomenon, that can easily cause the collapse of a poorly designed beam. In civil engineering codes, the critical bending moment is crucial in the proper design of bent beams susceptible to LTB, as it allows for slenderness calculation.  In “typical” cases everything is ok since code equations [...]

Linear vs Nonlinear Buckling

By |May 8th, 2016|• Linear Analysis, • Nonlinear Analysis, FEA: Intermediate, FEA Topics:, • Linear Buckling, FEMAP|

Topic of linear and nonlinear buckling is one of the most searched FEA topics. It is understandable, since lack of knowledge about the difference in both approaches can lead to great overestimation of model capacity and following real-life instability failure. In this post I will discuss the difference with a shell example. […]