Column with variable cross-section

[Anonymous]

Hi,

I'm about to design a 10 meter steel cantilever column with variable cross-sections. I don't know what method should I use. Am I suppose to  build different cross-section column and make a superbar out of it, or gradually biuld my way from the bottom ? I have a problem with slanderness and how to deal with it due to changing cross-sections. How should I deal with that properly? Thank you for your answers.

[EduardoMeruvia]

Hi @Anonymous, 

Have you look into using the custom tapered section tool in robot? See figure below; 

This tool allows you create variable cross-section sections of different kinds. 

Hope this helps. 

[Anonymous]

The problem is not how to create such column, but how to obtain correct results. Cross-section doesn't change gradually but like this:

When I create a superbar it gives me results only for one section of a column. But it is the most strenuous one. So it is possible to check every bar, however I find it very unconvinient. Node shift can be only 10cm. I obtained result such as: 5m- round pipe 273x10; 2,5m- round pipe 193,7x6,3; 2,5m- round pipe 168,3x5. The node shift is 10cm, and there is no problem with slanderness and ULS. My question is: does this profiles have to be this big, or am I doing some mistake ?

[Artur.Kosakowski · Accepted solution]

Hi @Anonymous

You should create a superbar but bear in mind that the results are shown only for a location where the calculated ratio is the highest. If you want to see what they are for another places check this article.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[Anonymous]

Is it still possible to read the article? Page is not found.