Non uniform shell load in ETABS 1

[AniMhj]

I am modelling a building with double basement. I have confusion in assigning the soil pressure in wall. I have calculated the coefficients C and D. My question is the use of restrictions - Use all values; Zero negative values; Zero positive values. Among these three options, which option should I choose?

 

[milkshakelake]

I wouldn't use ETABS to model soil pressures. You will be in a lot of headache if you use FEM for lateral earth pressures. Something like that is better handled with hand calculations or a spreadsheet. If you use FEM for that, you need to check a lot more stuff, and it's not worth it.

I mean, I can guide you through how to do it in ETABS, but it's really a lot more work. With the way ETABS is coded, it's mostly designed to handle "bigger" problems like gravity and lateral analysis. It can be used for earth pressure analysis, but the program is not designed for that.

 

[Trenno]

Build a basic model that you can verify reactions and moments by hand. Only then apply the same principles to your larger, complicated model.