2nd Order Analysis on 2D Braced Frames

RE: 2nd Order Analysis on 2D Braced Frames

Seth Guthrie — Tue, 07 Sep 2021 17:00:12 GMT

Click F1 on the keyboard while the analysis dialog is open to get help on that.

RE: 2nd Order Analysis on 2D Braced Frames

Jake Nichols — Tue, 07 Sep 2021 16:40:44 GMT

I tried modified and it worked. What is the primary difference between the two solver methods?

RE: 2nd Order Analysis on 2D Braced Frames

Seth Guthrie — Fri, 03 Sep 2021 22:39:27 GMT

Did you use the Modified method? Is it version 16.04.00.187?

RE: 2nd Order Analysis on 2D Braced Frames

Jake Nichols — Fri, 03 Sep 2021 22:34:34 GMT

I fixed the column bas for RY and also turned off all segmenting on the FEM to rule out any of those settings causing an error, but I am still unable to get the model to run second order.

RE: 2nd Order Analysis on 2D Braced Frames

Seth Guthrie — Tue, 31 Aug 2021 22:57:31 GMT

There could be a problem of columns spinning about their 1 axis. Fix the base vs RY to rule that out. Using tension-only members with P-Delta analysis is the other factor to contend with here. Finally, if you don't want a node at the cross of the X, turn off the option "Add intermediate nodes at member intersections" on the FEM tab. I don't usually recommend this for tension-only X braces.

RE: 2nd Order Analysis on 2D Braced Frames

Seth Guthrie — Tue, 31 Aug 2021 22:51:29 GMT

Is it the "Generic" model giving you the problem? I found that the P-Delta analysis would work if I used the Modified Newton-Raphson method (Solver tab in the current version). I also set the Model DOF to 2D frame, though I don't think that mattered. Click F1 for help anywhere inside the analysis dialog to see more on the 2 methods.

RE: 2nd Order Analysis on 2D Braced Frames

Jake Nichols — Tue, 31 Aug 2021 22:17:10 GMT

Sorry, RAM Elements

RE: 2nd Order Analysis on 2D Braced Frames

Seth Guthrie — Tue, 31 Aug 2021 22:13:25 GMT

What software and version are you using?