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How to model intersection of structure-soil

Hi Everybody

 

I have post my problem in this forum, but it seems I did't express my problem clearly, now please allow me to describe my problem in a detail way:

 

Our jack-up platform is standing on its mat structure with 65mx65mx5m, the load will transfer from the colum structure into the mat-column connection and eventually spread out to the seabed. And now my task is to check the mat strength in different load cases. But I don't know the right way to simulate the soil(which only carries the compression, transverse force,no tensile force)  beneath the mat, before I tried function spring in Non-linear analysis, I obtained one result sucessully, but it seemed unreasonable. Then I attempted gap element, but the software can not converge, then I really had no idea how to solve the application of gap element.

 

Those masters hovering in this forum, please give a hand and help me out, I would be very grateful, if you don't mind, it is very great you email me directly txt653778649@gmail.com

 

Look forward to you

 

Cheers and happy good friday upcoming