Scissors subtitle slenderness problem..

Ahmet KELEŞ

New Member
Hello; Due to the L/i design rule of the truss lower heads that I modeled with a box profile of 80*140*5 mm in 15 m span, the G+0.7Ey load combination is insufficient. When I increase the profile width, I solve the problem, but it is not a very economical section. I am attaching the project, I would be glad if you could help with the subject.
 
80*140 profile I have never seen before. There isn't any. I didn't see the project but wanted to write it. There are 100*150 in the market. Make a mm reduction for economy. If it doesn't save you, I advise you not to do business just because someone will pay less. good work Sent from my SM-N920C using Tapatalk
 
Hello Mr. Ahmet; Thank you to our users who have given appropriate answers before. What you need to do is to provide economy by reducing the slenderness ratio calculated with kl/r you know. In your project, the solution is to either use additional elements to hold the truss subheads or enlarge the section. Good work.
 
Hello Nurgul; I thought about dividing the subtitles, but since scissors is a stand-alone macro, I couldn't find an option to split the subtitles in it. I would be grateful if you could show me a way around this.
 
Hello there ; You can connect the sub-header not by dividing it, but by defining a column in between, for example with a support joint at its midpoint. Considering the singular foundations on the F' axis in your intention project, there is no obstacle to placing columns. In terms of more economical results, apply the vertical stability braces that you have created on the F and H axes in the ridge area and at the starting and ending points of the scissors, holding the top cap, or model these braces on your current axles so that they also hold the top cap and compare the analysis results. For a similar application, if you look at the last parts of the video at
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, only in the ridge region vertical stability braces are modeled. It will set an example for you. Good work.
 
"nurgulkaya":36km4woa" said:
Hello ; You can connect the subheading not by dividing it, but by defining a column in between, for example with a support joint at its midpoint.
In this case, we put a column in the middle of the structure, is there any point in using scissors?
 
Hello Mr. Mehmet; The main solution is; It is to reduce the retained length of the heads to half by creating a cross system that will provide vertical stability between the lower and upper heads of the scissors. In order to eliminate problems in the slenderness controls of the pressure and tension elements and to ensure the stability of the structure. It has been explained that the project is available and the column can be defined due to the singular foundations on the F' axis in the user project, which is meant by the column. If you want to divide the trusses, you must use the articulated connections, not the rigid connections, from the points you have divided to solve the buckling length problem by obtaining the steel beam and truss geometry without using the truss command and dividing from the places you want in the lower and upper headings. Good work.
 
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