Imperfections in buckling design

By | January 31st, 2017|• Nonlinear Analysis, • Stability, FEA: Intermediate, FEA: Advanced, FEA Topics:, Structural Design Topics:, FEMAP|

Using deformations from linear buckling as imperfections in nonlinear buckling case is the most common approach. I will use a simple example to prove that this is not always the best idea. Proper selection of imperfections is a very complicated process – I hope to shed some light on this matter. […]

Linear vs nonlinear buckling explained!

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

Nonlinear buckling explained simply

By | January 10th, 2017|• Nonlinear Analysis, • Stability, FEA: Intermediate, FEA Topics:, Structural Design Topics:, FEMAP|

Nonlinear buckling is a really interesting analysis. It gives you enormous possibilities, at only a few minutes worth of work. At the start, it might be frustrating to set it up (there is a learning curve involved), but in the end, it is a default engineering tool for me right now! Possibilities are limitless! [...]

Linear buckling in plain language!

By | January 2nd, 2017|• Linear Analysis, FEA: Basics, • Stability, FEA: Intermediate, • Linear Buckling, FEA Topics:, 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. […]

One of the best talks I have ever had and my presentation on ICMS 2016

By | July 3rd, 2016|• Nonlinear Analysis, • Stability, FEA: Intermediate, FEA Topics:, Structural Design Topics:, Events|

Today I will post about something a little bit different. I had an opportunity to be at International Conference on Metal Structures (ICMS 2016). It was a 3-day event gathering scientists and practitioners from all around the world to discuss new trends and ideas in steel structures. I had a privilege to have 2 presentations [...]

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

By | May 29th, 2016|• Structural Steel, • Stability, FEA: Intermediate, • Linear Buckling, FEA Topics:, 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, • Linear Buckling, FEA Topics:, 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. […]

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