First use beam elements to get a quick answer of both displacements & stress results using both linear static (SOL101) and also nonlinear static solutions (SOL106) to compare results. Also you can run a linear buckling analysis (SOL105) to get an idea about the buckling load factor.
Repeat the model using shell elements, this will give you insigh information of the local stress results in the intersections between tubes, that´s all -- enjoy!!.
hi thanks for your reply i currently have a 28mm od aluminium pipe with small flag on the end under no wind conditions it does not flex. but a slight wind makes it flex and sometimes it will sway abit is it possible to simulate the flex in worst case scenario
You can still simulate this with buckling. Apply a unit load in the wind direction at the top of the pole to simulate the interaction of the wind and the flag. The buckling analysis will output a load factor for the first buckling mode. The total load for that buckling mode is the product of the unit load and the load factor. As you increase the stiffness of the beam cross section, or decrease the height of the pole, you should see the load factor increase.
A strong enough wind will cause the pole to sway even without a flag. To simulate that you would have to apply a distributed load along the length of the pole in the wind direction. Do a buckling analysis with just this load. Do a buckling analysis with the combination of the loads as well.
If you have a horizontal displacement limit that is far below that required for buckling, then skip the buckling aspect and just do linear statics analyses.
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