Buckling length in sway and non-sway structures

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 [...]

Buckling length in sway and non-sway structures

[Q&A #1] Career in nonlinear FEA and stability of a complex structure

Since I announced Q&A column on my blog I got several great questions so far. I will try to answer as many of them as possible at the end of each month. If you have sent me a question and you didn't find an answer here no worries! I store all of them and I [...]

[Q&A #1] Career in nonlinear FEA and stability of a complex structure

Buckling length basics

I'm preparing materials for another training about stability and I figured I have never written anything about frame stability on the blog! It's high time, so I decided to make a small roundup of methods on calculating buckling length in a frame system. Buckling length - do I need it? Let's start with the obvious: [...]

Buckling length basics

Design your silos with FEA – it pays!

Designing steel silos with analytical approach always yields very conservative results. Nonlinear Finite Element Method allow for great optimization of those structures (and other shell structures as well!). I will discuss this based on a silo I have recently designed. […]

Design your silos with FEA – it pays!

Imperfections in buckling design

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. […]

Imperfections in buckling design

Nonlinear buckling explained simply

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! [...]

Nonlinear buckling explained simply

Linear buckling in plain language!

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. […]

Linear buckling in plain language!

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

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 [...]

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

Critical bending moment: How to calculate it with numerical analysis (in 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 [...]

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