Cross Slenderness Ratio Upper Limit Exceeded

[muhammedtanyildizi]

Hello. My problem in my project that I am trying to solve is giving an error saying Cross Slenderness Ratio Upper Limit has been exceeded while receiving report. I've just started to learn about Steel Structures and I'm trying to draw a project slowly.. I would appreciate it if you could help me with this problem.

 

[nurgulkaya]

Hello there; The only solution you can do is to enlarge the section. Regarding steel structures, Prof.Dr. It will be useful for you to study Erdoğan Uzgider's Steel structures book. Good work.

 

[muhammedtanyildizi]

Thank you for your reply.. I will look into the source you suggested..

 

[muhammedtanyildizi]

Hello again, Ms. NURGÜL; Regarding the diagonal slenderness problem, we have solved the problem at very high sections. LIKE L 200*15. Is this normal? High dimensions for the cross, right?

 

[nurgulkaya]

Hello there; It is difficult to comment without seeing your project, but choose x cross as type and use profile pipe profile. You can start with 88.9* 6 as a profile. From the TDY options in the analysis settings, set the ductility level to normal and the r coefficients to 5. Good work.

 

[muhammedtanyildizi]

Ms. Nurgül, I could not upload because the file size is large. Is it possible for me to send it to you via mail?

 

[muhammedtanyildizi]

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I tried to share the file. Hopefully it did.

 

[nurgulkaya]

Hello there; Your project gives a virus warning, I can't download it. Can you scan and send securely? Good work.

 

[muhammedtanyildizi]

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I scanned and reposted.

 

[nurgulkaya]

Hello there; The slenderness problem of the braces arises from the Earthquake Code controls. In case of an error, necessary checks were made and it was seen that there was no error. You can simply check it manually by looking at the attached image and the Earthquake regulation. There is information about the situation I mentioned in Article 4.7.1.2 on page 72 of the Earthquake Regulation 2007.

 

[muhammedtanyildizi]

Then there is nothing you can do in this situation.

 

[sereze]

The program checks the cross slenderness according to 4.6.1.2. But that article says for the pressure elements in the cross system. Wouldn't it be better to not run the crosses under pressure and check according to the cross-section conditions in table 4.3, not according to 4.6.1.2? It was done in the same way in Erkan Özer's notes. That way the cross-sections come out really big.

 

[nurgulkaya]

Hello there; It is absolutely necessary to check your cross sections according to 4.6.1.2. In all cross types that can be used, the results for vertical braces are one bar pressure and the other tensile member. When earthquake loads are in question, all rods will carry pressure under one load, due to the change of direction of the earthquake load. If you send your project, we can look at the sections you specified as large. Good work.