By |October 31st, 2017|FEMAP, Linear FEA, Nonlinear FEA, RFEM, Stability, Steel Structures|

I got a really interesting question on my email from Fateme. I wanted to address this issue so many times now, so finally there is a great occasion to do this! In Abaqus, can we review the capability of a structural member? Whether or not it can bear the load like: shear, bending, twisting, axial [...]

## FEA results verification with hand calculations: stability

By |October 19th, 2017|Linear FEA, Nonlinear FEA, Q&A, Stability|

Last time I described 5 steps to FEA results verification. Among those steps were FEA results verification with hand calculations. I figured it makes sense to expand on this idea. Especially since Luke asked me about something on this topic via email. Luke asks: How is the eigenvalue calculated, can this be done longhand? Can [...]

## Buckling length in sway and non-sway structures

By |August 31st, 2017|Linear FEA, Stability, Steel 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 basics

By |August 22nd, 2017|Linear FEA, RFEM, Stability, Steel Structures|

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: [...]

## Structural rigidity explained!

By |April 25th, 2017|Linear FEA, Stability, Steel Structures|

Structural rigidity is a very underrated concept I'm afraid. You see, usually, which part is more rigid than other does not directly influence the code-driven design methods. "Magic" happens when you do static design, and this process is far less regulated that dimensioning itself. I often meet engineers who completely do not understand this concept. [...]

## Geometrically nonlinear analysis – how does it work?

By |March 26th, 2017|Linear FEA, Nonlinear FEA, Stability|

Geometric nonlinearity is incredibly useful in structural analysis. It can help you check if your model is correct, or allow for a great structural optimization. Today I will discuss the basics of what does geometrically nonlinear analysis do using not the theory but real-life examples! […]

## Imperfections in buckling design

By |January 31st, 2017|FEMAP, Nonlinear FEA, Stability|

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|Nonlinear FEA, Stability|

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 FEA, Stability|

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 FEA, Stability|

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. […]