Wind Loading Critical in Comparison with Seismicity - Eurocode

Is the Swiss Family Robinson trying to design a better abode?

Is it a braced frame ? Or a moment resisting frame ? Or other e.g. concrete core.

If moment resisting, be careful that the joint details can take the moments too.

As per EC8 6.1.2, if it is a dissipative structure then it is inelastic in response by definition. The whole of chapter 6 is important to read and understand and is worthwhile investing a significant amount of time doing so.

What will happen if you get a seism when wind blows ? or vice versa ?

Seismic load (induced) depends on the weight of the structure. Wind load (applied) depends on the surface area of the structure . Whether the structure is lighter or heavier, the wind load will remain dependent on the surface area. So, consider which one is critical.

I disagree since I remember that many many years ago I had to check the fasteners for a quite tall structure on its foundation and we had to consider the probability of the two appearing at same time. Of course I agree with the fact that the loads have different bonds with the structure.

willyap06, indeed this is it. At first iteration - the wind loading is critical, as the floors are really light weight, but there is a big area for the wind to load. Therefore, because of the wind loading, I have big columns displacements. The frame I consider moment resisting, but hinged to the foundation. To satisfy the SLS checks, I increase the columns sections (HE A). Beams of the moment frame are also big, as the spans are not small. Earthquake combo is not critical for any of the structural elements. So that's why I'm thinking that in case of an earthquake the structure will work mostly in elastic stage, as the sections are big enough and the beams will not reach point of plastification. And if the structure really works in elastic stage, as earthquake combination is not critical - than was it correct to take behaviour factor q=4 in the beginning? Concerning combination earthquake + wind - > I didn't make such. I think in Eurocode there is not a restriction like this. Earthquake normally combines with gravity loads.

CvSi: If wind load is critical, do you still use the "behavior factor" q? If you are going to consider earthquake load then refer to "Eurocode 8: Design of Structures for Earthquake Resistance".

Hope this helps.

willyap06, yes wind load is critical. But does this means that I don't have to add also all the checks and combinations for earthquake to prove it.

Check both and compare.