Wind analysis in ETABS

[ThomasH]

Hi all

I have been involved in a discussion regarding ETABS and wind analysis.

The question is fairly staight forward. Say you have a structure, for example a high building. Can you model it in ETABS and let the software automatically calculate wind effects from phenomena (gust, vortex shedding, galloping etc)? And, will the software calculate the accelerations for the comfort analysis?

I have my doubts, hence the question. Because I don't have ETABS so I can't test it.

I am primarily just qurious.

Regards

Thomas

 

[chekre]

etabs can calculate the accelerations and will give it to you in separate tables. however , for the factors that u mentioned, u will have to calculate these factors and enter the values obtained in etabs.
for example, gust factor will depend on the period of your building. u can extract the fundamental period from etabs, calculate the gust factor on a separate sheet and insert the value in etabs box.

 

[slickdeals]

ETABS can calculate accelerations? What accelerations are you talking about? Certainly not wind induced accelerations.

 

[ThomasH]

@chekre

Are we discussing the same accelerations?

I think that comfort accelerations due to wind can imply both stocasic analysis (gust effects) and harmonic effects (vortex shedding). How the structure responds depends on the wind directuion so it is relatively complex to implement in a general fasion.
Before I wrote the first post I read somewhere that ETABS should be able to handle "dynamic wind analysis". That was why I asked.

The impression I have now is that ETABS does the same type of analysis as the competitors on the marked. I may be wrong but my impression is not that it is able to a stocastic wind analysis with several modes and modeshapes.

But it would be interesting if somebody knew for sure.

Best Regards

Thomas

 

[chekre]

i misunderstood , my apologies ! etabs will not calculate accelerations due to the wind for sure !

 

[nathan7]

Etabs doesn't do time depended wind analysis, as such it doesn't calculate the acceleration. You need to manually estimate it based on deflection and period