Skirt seat opening issue
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Hello everyone, this is my first time posting a technical assistance request, so I hope you can all give me some help! Recently, when I was calculating a tower, I found that the openings in the base of the tower wouldn’t meet the required specifications in the calculation reports. I used the PVELite software for these calculations, and there were always red warnings in the reports. Now I’m posting the relevant content from the calculation sheet: opening ratio at weakest section EN13445 Equation 16.12-76 = delta*sqrt(r/ez) = ..... (related data calculations). WARNING: ratio exceeds 2; see EN13445 16.12.76(a) to check whether the largest access opening is too large. After examining it carefully, I found that this ratio depends only on the thickness of the skirt and the size of the opening, with nothing else affecting it. My approach was to thicken the wall thickness of the skirt, but that’s too wasteful; I’m not sure what other methods others use
This sometimes doesn’t need to be worried about. It mainly depends on whether it is tensile stress or compressive stress. You can look up the calculations related to the openings in the skirt section in EN13445-3; by reading it carefully, you will understand
I think the same way – it’s mainly tensile and compressive stresses. But this is for calculating the critical section, and I still don’t understand what the opening calculations specified in EN13445 are for. Could anyone please explain this? Thank you