roof cross delicacy

S

sefaaydinn

New Member
hello, there are two general problems that I have started to experience in my projects. In the truss elements, only (1 diagonal, sometimes 1 upper heading and sometimes a single subheading error) all other elements are in a state of recovery. 2-despite the large cross-sections, although it provides strength on the roof crosses, the slenderness error 3-facade purlins gave deflection error in the project I added, it makes me comment that all the elements of the truss were saved and not a single diagonal saved me, because the truss did not save a single diagonal:).I must be making a mistake somewhere. and again, the slenderness error of the roof crossovers. Thirdly, the deflection error of the façade purlins despite entering the same section as the roof purlins. I must be making a mistake here again.
 
Hello there; 1- Subheading or header inadequacy and slenderness problems should not be considered as a single element problem. As they are the main elements of the truss system, care must be taken in their design. When you usually create inclined trusses for your diagonals, the grid creation of each section gives the most positive result in terms of load flow design. As much as possible, your diagonals should be formed with 30-45 degree angles. When you see insufficiency, first try to find a solution to the number of truss sections and roof slope instead of increasing the cross section. If a solution cannot be produced with these, you need to increase the cross section. * Information about delicateness has been shared many times on the forum before, check it out. 2- Be sure to look at the shared delicacy titles. However, since slenderness = k*l/r, you should either decrease the element length or increase the element cross section. Depending on whether the brace is under tension or pressure, the limit changes in the Steel Structures Regulation. These limits must be respected, so slenderness is like a lack of deflection, even if the strength is sufficient, you have to fix the problem. 3- The reason for the deflection error in your facade purlins is due to leaving an unsupported purlin tip at the top. You can see it more easily than the image. Good work.
 
Ms. nurgul is again a façade purlin deflection error. While the npu160 section saves on the roof at 6-7 mt openings, it is insufficient in similar façade openings. Apart from this problem, I will ask about the general situation in my project?
 
Hello there; Deflection insufficiency is seen only in the facade purlins. There is a deflection error for purlins reported in the program. After selecting purlin loads and coating loads in the loads section of the program, take the fixed, moving and wind load values, apply them on the simply supported npu 160 section and check the results. You can apply this process by entering a single simply supported beam in a different model.
 
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