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 [...]

Design your silos with FEA – it pays!

By |February 28th, 2017|• Structural Steel, • Nonlinear Analysis, • Stability, FEA: Intermediate, • Post Processing, FEA Topics:, Case Studies, Structural Design Topics:, FEMAP|

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. […]

Connection rigidity: 5 things you need to know!

By |February 13th, 2017|• Structural Steel, • Connections, Structural Design Topics:, RFEM|

Most engineers use a popular approach: connection is either a hinge or a rigid one. This is usually not the case. Just as with many other engineering problems in certain cases we simplify the reality by assuming perfect conditions (i.e. hinge). It is crucial to understand when such assumptions are incorrect, as this may lead [...]

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. […]

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|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. […]

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, 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 [...]