Ln and buckling length

[mehmetkarasoy]

hello, in the truss system, which I designed as some beams and some as trusses, I am considering increasing the moment strength of the system and reducing the span of the truss beam with bar elements that will create a truss-like truss feature at the bottom of the upper truss beam that continues continuously. However, I saw that the strut elements are not taken into account in the deflection calculation of the truss beam and the full length of the truss from the column to the column is used in the deflection calculations. I think that the same situation is also present in the columns that I intend to shorten the buckling length (it may have taken the buckling length on the other side of the column). How do we arrange the definitions of Ln and buckling length. I would be glad if you help.

 

[nurgulkaya]

Hello there; As can be seen from the image, it is correct that the program uses full opening for deflection. You can see the results of the program for LTB by selecting the element on the steel design screen and entering the details in the window that opens. If you send your model we can check it.